350x head on 300ex?

[2muchquad]

i remember reading about a guy that had a stroked 300ex with this and that and he says he had a 350x head on it.are these heads interchangeable?has anybody ever done it?sure i imagine anything can be done if you got $$$.im just wondering if this guy was full of it.he was trying to get $1500 for this motor.anybody ever hear of this,i know the engines are similar but my 350 cylinder looks like a xr 500 cylinder compared to my 300ex motor.i dont want to tear down 2 perfectly good motors to see for myself either..lol:D

[ghak99]

I heard something about this one time, but can't remember what the deal was. I do know the head on the 350 has 2 exhaust ports and the 250/300 only has one so the pipes would not interchenge.

[2muchquad]

nobody has heard of this?i thought there were experts on here?:D

[dork]

if it was done they'd probably need to use the 350x cylinder too as the timing chain opening is larger on the 350x head. also i think the 350x valves might hit the sides of the 300ex cylinder if it was stock bore. and if the 350 cylinder was used, they would have needed a custom piston because the 300 has a smaller wristpin than the 350.

[Orr#34]

I have done alot of work on 250x/300ex and I have a 250x built by tc and it has a 350x head on it. it uses a 360x pipe and there is some machine work you have to do. It also has 6 gears in it . I am now working to put a 250x cylinder and head on a 250x bottom end.

[Orr#34]

it can be done because i have one at my house it was built by tc. it is a 465 and it has 6 gears. 250x bottome and 350x head.

[oriclez]

This idea is full of stupidity. I now remember why I left these forums. 99% of this forum is filled of stupidity. The 300ex has a 4 valve head. A 350x has a 2 valve head. Some idiot already made a mistake about this. The 350x uses bigger valves/flow design, but won't come close to what a 300ex with the proper headwork flows. You may be thinking why do companys put 350x heads on them than. Guess what? They want your money. They will make anything to get your money. No fast 300ex's would use a 300ex head. My 300ex rapes banshees, and by going to a 350x head my guess is I would lose about a 4-5 HP, and Torque to a stock head, and 2-3 HP and torque to a modded 350x head.

[2muchquad]

My 300ex rapes banshees,


dude,what are you smokin?you need to pass that around,dont be stingy..lol i love my 300ex dont get me wrong but i could throw a *****load of $$$at and it still wont beat a banshee,not even a stock banshee(they are36 hp stock)a 350x is a 4 valve motor NOT 2.

[oriclez]

I've built 2 440 350X's in my life. Yank the head off it its a 2 valve you moron. 1 Exhaust and Intake valve. Before you even talk you should have asked what was done to my 300ex. I work at a racing shop out in oregon.

[2muchquad]

why do i have to be a MORON?you must be thinking about a yamaha warrior,its only got 2 valves.why does a 350x have dual exhaust ports then?your obviously mistaken.you better pack a lunch before you ever try and win a argument with me.im up on my facts.i have been wrenching longer and riding these things before you were even born.man theres a lot of CLOWNS on here..:rolleyes:

[2muchquad]

why do i have to be a MORON?you must be thinking about a yamaha warrior,its only got 2 valves.why does a 350x have dual exhaust ports then?your obviously mistaken.you better pack a lunch before you ever try and win a argument with me.im up on my facts.i have been wrenching longer and riding these things before you were even born.man theres a lot of CLOWNS on here..:rolleyes:

[hrc85250r]

hahaha, oraclez.....poor SOB.....oh yeah, and a 350x head will always flow more than a 300ex regardless if it is a 2 or 4 valve, because its made for a 350 not a 300, and if your 300ex can beat a similarly modded banshee well....it wouldnt happen...

[oriclez]

Your right. I was thinking of the warrior. You've been wrenching longer than me? Can you tell me how to install a counter balance for a stroker? Can you tell me how to hardweld a cam?

250R you are a moron. Its like telling me a 502 is going to out flow a 460 that has major head work done.

[dork]

dude, how old are you to be coming on here and calling people morons when you're the wrong one, come on how can you even mistake the 350x for a warrior?

and if by installing a counterbalancer in a stroker you mean clearancing the flyweight for the longer throw and balancing it to the amount of weight removed or added to the crank, then yes. and hardwelding a cam is a process by which the lobes are ground down and a nickel or cobalt hard surfacing alloy is welded on and then reshaped to the proprer profile.

and while i'm sure your 330ex runs great, you won't be "raping" banshees that have any mods past pipes, unless you're running alcohol or something. my 380 runs awesome, but lets get real here...

[Aceman]

Why don't you let me know what racing shop you work at here in Oregon so I can make sure I avoid it.:rolleyes: Your a real winner dude, you talk a lot of chit. Save the mods some time and some trouble and just stay off the site. You clearly can't get along with people, I for damn sure wouldn't let you work on my quad.

[Orr#34]

oriclez you are the moron in this conversation, because the 400ex is based on the 350x head . that is why the 350x head will out flow a 300ex head any day morron. and i have one that will smoke your little 300ex with your stock head. I race nationall tt so come to one and you will see what a real 250x/350x can really do. I dynoed it and it turned 38 with a blown head gasket. what now.

[wilkin250r]

The Honda ATC 350X is a 4-valve head. I know this for a fact, I'm sitting 4 feet away from my 350X engine right now.

[Orr#34]

think you for telling these morons that its a four valve head. so its going to flow better then a 300ex head.

[ghak99]

Originally posted by Orr#34
it can be done because i have one at my house it was built by tc. it is a 465 and it has 6 gears. 250x bottome and 350x head.

I am curious how you got a 250x motor to a 465cc? The largest combination I was aware of was 426-428cc.

[2muchquad]

he got that by using the 2 valve 350x head and cylinder on his plus 20mm stroker 250x bottom...:rolleyes:

[oriclez]

I love how you go talking like 38 HP is a lot when my 300ex is doing more than that running a bad cam. Took it to the our dyno a month ago or so and was running in the low 40's HP. I am gonna probally tear it down soon, and go over it and convert it to alcohol. And this 40 HP was on a good torque curve. Not one of those peak Horsepower quads with a instant drop off. Half the reason all these engine companys do that is because the parts they put on your quad aren't made to go with each other.

Because the 400ex was based of a 350X head design does it means the 350X design is the same? No.... The design is far from being a good flowing design moron. Good work. All these quad companies you are bringing your engine to is gonna do the work the cheapest way they can. Hell any machine shop would. I work at a racing shop, and we could do better work on quads but we don't. No one sees a reason to spend the extra hours doing the work, for the same price. The reason my is flowing as good as it is, because I took time to do everything the RIGHT way. I don't wanna go to start up my quad and throw a rod the first thing.

Whoever said i have a 330ex has no clue WTF there talking about. Im running a 406ex right now.

[wilkin250r]

38hp IS a lot when you're talking about a 300EX.

Just curious, why would you build a 300EX to over 40hp? The ONLY reason I can think is age restriction in a racing class if you're under 16 (which would explain your incredibly annoying 'Holier Than Thou' attitude).

[oriclez]

250R. I've had this asked a lot. How many times have you pulled up to a fast 300ex? Im guessing never(possible you have, but anyways). I do have a 250R also. Its pretty close to stock with a pipe. My 300ex beats it. I want my 300ex fast because of things like this. Cocky people on 250R's that get blown by a 'slow' quad.

[wilkin250r]

Whatever floats your boat, I guess. You're certainly entitled to your opinions and all. I just don't quite understand it. It seems like an awful lot of time and money to be throwing into a 300EX.

You know the old saying about running in the special olympics? Even if you win, you're still retarded. While that's rather cruel, there is still a message in there. So you have the fastest 'slow quad' around. Whoopee! It's still a 300ex, and in the grand scheme of things, it's still slow. 40hp is a lot for a 300EX, but when you're stacked up against the big boys, 40hp is nothing. You might catch somebody off-guard and surprise them, but you're still not a major contender on the drag hill.

Now, with that same amount of time and motorwork into the 250R or a banshee, and you COULD be a major contender on the drag hill, not just an odd little surprise.

[deathman53]

I really can't attest to spending money on a bike they say "isn't worth it". I was told I was crazy to buy a extended axle, works rear shock, port/polish, carb, 84 250r front end, and other odd parts for my 86 atc200x. It sure does turn heads when I pass the quads on the trails by my house. ALOT of people told me I was nuts to buy a 310pv, +1 extended swinger, lsr axle, beadlocks, elka suspension, and a host of other expensive parts for a 86 atc250r, I was told many times "buy a 86 or 87 trx 250r, take them parts off and put them on the quad, then trade the extended swinger for a -1, then buy a +3 front end and you will have a awesome quad". I told them, "well, if I had a quad you guys wouldn't be shocked".
Again, I believe my money was well spent and it is the bike that I wanted. Just think about it, some people spend as much money as a 380 motor kit on ONE GOLF CLUB.

[oriclez]

Wilkin, I know many 40 HP quads wont be competative at big bore built quads, but there was a article about a 275lb 250x alky quad that had no problems beating built banshees. Now I know I probally wont ever have the time or money to go down to 275lb, but my goal is just to have a fun time building a reliable sleeper. Right now the nice thing about these is they have no radiators or anything. Some people put oil coolers in but if you use good oil I don't see a reason for a oil cooler, other than keeping it down a bit. More of a money gimic. Just get some extra flow to the cylinder fins and it will run pretty cool. My goal is to drop this down to low 300's dry. I gotta weigh it later on.

[2muchquad]

I don't see a reason for a oil cooler, you obviously have some homework to do.if your gettin those kinds of numbers from a small single cylinder 4 stroke and you dont see a need for an oil cooler..:confused: please tell me your jokin.anybody in their right mind knows heat is the number enemy of the internal combustion engine.anytime youcan help the motor run even 10 degrees cooler it substanstial.but you being the master engine tuner,you probably just drill extra vent holes in the crown of your pistons..lol:D

[oriclez]

10 degrees=~1 percent of your HP. A oil cooler isn't going to drasticly change that number. I'd rather get a long steady stream of air directed towards the cylinder than a oil cooler, unless im riding in super hot weather which is a rare case.

[Orr#34]

Just for yalls information you can build a 465 out of a 250x cylinder and only a 350x head not cylinder. I have a 250x that is a 465 how you ask well it was built by the man tom. TC is one of the best in the bussines. he used a 91mm piston with a 71.5mm stroke. do the figuring. it comes out to be a 464.02. so what is that well let me see. 465 what now if you dont beleive me then call tom and ask about jordan orr's 250x and he will tell u its a 465 and it has 6 gears. 16:1 compression.

[duke416ex]

16:1 compression, where did you get a starter to turn that over, off a peterbuilt? I guess you built this bike just to trail ride too. Let's see, at 12:1 or higher you run 110, what do you run at 16, alcohol? A little expensive to just ride on. And why even build anything like that to race, I don't race anymore, but I know having a sleeper on a racetrack was a useless as tits on a bore hog. If it was that simple to just build a 250 or 300ex to be the baddest bike around why would anyone in their right mind ever wanted to go through the trouble to design a 400, or a 450, or a 660 or any other engine.

[ghak99]

A 250x is kick start only. If it really is 16:1:eek2: , how in the hell do you get it started? What fuel do you run? You are saying you have a 91mm piston in a stock 250x jug, I just don't see enough material being left in the walls of the sleeve and jug after cramming a 91mm piston in them to sustain 16:1 compression.

Do you have any pictures of this quad, I would like to see it.

[deathman53]

Sorry I don't believe you. You have to have a 350x motor in your bike, also isn't a 250x a 5 speed?, the 350x is 6 speed. The biggest a 250x can be built is a 400 and thats with paper thin cylinder walls, and there is no such thing as a 16:1 piston, that would rip the studs out of the cylinder. Hell, 400ex's with 13:1 tend to rip the studs out, there is no way what you are saying is true. show me a pic of the kick starter and I'll tell you weather you have a 250x or 350x motor. On a 350x with a 12:1 piston you can stand on the kicker and it hardly moves(with the decomperesion disconnected), a 16:1 I don't even think a 300 pound person could move the kicker.

[honda250xrider]

I have only heard of a couple motors like that but they were with 350x motors. They were built by tom but they used the 350x engine to achieve that 465cc. And yes the one i saw with with a 16:1 compression piston

[hrc85250r]

Originally posted by oriclez
Your right. I was thinking of the warrior. You've been wrenching longer than me? Can you tell me how to install a counter balance for a stroker? Can you tell me how to hardweld a cam?

250R you are a moron. Its like telling me a 502 is going to out flow a 460 that has major head work done.


hahaha, you install a couterbalancer on a stroker the same way...and yes, i can hardweld cams, i also TIG weld aluminum and ss and i arc weld steel beams for homes...i mig and tig custom gas tanks for buggies too...thanks

oh, i can machine my own quad parts on a bridgeport too, but yur right i am the moron, i just started CNC and im not that good at it...

[oriclez]

Hell I haven't manually CNCed anything for so long. We have everything programmed for the most part which is nice.

[ghak99]

Originally posted by deathman53
Sorry I don't believe you. You have to have a 350x motor in your bike, also isn't a 250x a 5 speed?, the 350x is 6 speed. The biggest a 250x can be built is a 400 and thats with paper thin cylinder walls

You are correct that a 250x is 5 speed, and the 350x is 6. They do build the 250x/300ex bigger than a 400 though. 410's are very common on our local TT and flat tracks, and a few 425-428's were built back in the day. I just don't believe a 465 is possible, but who knows.


I could be wrong but I believe I have the largest stroke you can put in one of these things. My 13mm stroker crank had minor clearence issues and required machining on the counter balancer to clear.

[oriclez]

ghak theres quiet a few 440 kits for the 350X. As for a 465, I haven't heard of one. But its possible I guess. I didn't know there where any 426 300ex's out there, but there was one in a GNCC race(theres a pic of it on the site).

[ghak99]

I don't doubt there are 440 kits for the 350x. He said it was 250x bottom end with only a 350x head. I am not sure this is possible, let alone hold 16:1.:eek2:

[oriclez]

Oh. I just read his post, I've been ignoring most of them. What a moron. Hes saying he has a 6 speed 250X bottom end, with a 250X cylinder with a 350X head?

[Rich250RRacer]

I don't really want to get involved in this little pissing match, but I'll clear two things up. I just looked at the microfiche for a 350X, it's a four valve head. The 400EX is not based on the 350X, it's based on the XR400. The 350X engine was derived from the 83-85 XR350R, which is one of the original RFVC (radial four valve combustion) engines. The bikes ran two carbs, one that was fully functioning, and the other had only a main circuit. The pilot jet circuit was blocked off, as was the air screw, I think.

[dork]

i'll add some more fuel to this fire...

tc built a 6 speed 250x for travis spader back in the mid 90's, i have a magazine article on it. i think that same engine also had twin lectron carbs on it. it uses the 250x cases, and had a custom intake welded for the carbs. its definitely a one off motor and not practical for anything but TT racing, but this was back in the 90's before the 400ex came out and the hottest new 4 stroke going was the 300ex.

the 350x topend was based on the 79-82 xr500 motor which was before the RFVC head design which came out on the 83 xr's. the 400ex is obviously based on this design. the 350x uses two rocker arms while the RFVC design is more complex.

FST had a 502cc 350x motor built with a 97mm piston on the stock stroke. do the math, it equals 502cc's. he also was running a xr500 non-RFVC head. now add a stroker to this and things really get out of control. i have his 92mm bore kit for my 350x that makes 452cc on stock stroke. case machining is necessary for the sleeve though.

[duke416ex]

to many engineers, everybody is getting all fired up. I'll admit, a lot sounds far fetched and there is a lot of bs here too. I don't know who what when or where the engines were designed, nor do I have to know this in order to know that 350x, 400ex and the 300 and 250 are all goo dmotors. Some of these ppl are just trying to be impressive and make you think they are top dog, the point is that you can tell who it is, and you can tell who knows their stuff and who don't.

[Orr#34]

Thank you dork for telling these morons that i was not stupid. I own the one the only travis spader tt racing bike. tom found it for me in new york and i went and bought. the only thing that i use it for is tt that the only time it gets started. but now everyone around here calls it pinky because it has a pink frame. and now it only has one big electron carb. I run C14 with additive in the mixture. if you don't believe then i gues yall will have to go to a national tt and short trak race or come done to kentucky for our start of our outdoor season and i will show yall what it can do.

[oriclez]

So your telling me you can kick over a 16:1 bike? Im highly doubting TC ever did a 6 speed 250x. Its near impossible for idiots like them to pull off. The guys a crook. I've seen the crap he does. Last person that brought a quad that he worked on into the shop blew the top end, within a couple days. I should start up a racing shop like this guy and rip people off. You can take a quad to a back yard mechanic and youll be doing the same HP as some of these racing companys, with half the price. It's not rocket science do to porting. I thaught myself and can gain about a 50 HP off a cammed 350, and if built good I can gain a good 75 HP.

[ghak99]

Originally posted by Orr#34
Thank you dork for telling these morons that i was not stupid. I own the one the only travis spader tt racing bike. tom found it for me in new york and i went and bought. the only thing that i use it for is tt that the only time it gets started. but now everyone around here calls it pinky because it has a pink frame. and now it only has one big electron carb. I run C14 with additive in the mixture. if you don't believe then i gues yall will have to go to a national tt and short trak race or come done to kentucky for our start of our outdoor season and i will show yall what it can do.

Just show me a picture of this thing already. I just don't see 465cc's in a 250x motor, but it might be possible who knows. If I ever get down that away I would be more than glad to bang nerfs and scratch wheels with ya on the short track.

[dork]

i'll scan a picture of the twin carb 6 speed 250x. its pretty wild.

oriclez, if you can get 50 hp out of 350cc then i bet the factories can't wait to get ahold of you, just think about it, a lightweight mid bore thumper with the power of 450's. and tc are a bunch of idiots...whatever

[2muchquad]

75 hp from a "built right" 350.holy cow!!..:eek2: i do agree with oriclez though,i think a lot of these companies are snake oil,they want you to pay too much when you dont get much on your return.i cant believe $200 for a camshaft!i bought a cam WITH lifters for a 350 chevy from Summit for $79.4 stroke singles have been around since the early 1900s so im not buying the supply and demand bs.$350 for "port work".i dont think so,theres not much to be gained for that kind of money.oh well im done ramblin..:o

[Orr#34]

Originally posted by oriclez
So your telling me you can kick over a 16:1 bike? Im highly doubting TC ever did a 6 speed 250x. Its near impossible for idiots like them to pull off. The guys a crook. I've seen the crap he does. Last person that brought a quad that he worked on into the shop blew the top end, within a couple days. I should start up a racing shop like this guy and rip people off. You can take a quad to a back yard mechanic and youll be doing the same HP as some of these racing companys, with half the price. It's not rocket science do to porting. I thaught myself and can gain about a 50 HP off a cammed 350, and if built good I can gain a good 75 HP.

First of all Tom can build one of the best motors in the world. And he is a good guy he is one of my sponshors. next to him Mike at FDO is another good noter builder. I have 2 motors that tom has build costume for me. And then i have travis spader's old tt bike. then i sent it back to him and he reworked it for me. he also built both of my 450Rs. I really don't care if yall beleive me or not but if yall want to try me then just bring it. And second i pull start the 250x with 16:1 then after i start it i can kick it over. every now and then i will get lucky and be able to kick it over. if you don't beleive me then look in the magazine it is in that dork said yall morons.

[ckasper18]

I got my first atc /us90 in August of 1969 which i still have not to mention i had over 40 three wheelers in my life which i still have 7 of them.I custome built more quads and three wheelers that would make your head spin which apparently the oregon kids head is always spinning.I have been working at my familys honda shop for over 29 years and this post is funny.Dont let this young punk bother you his boss knows all about him he has to act this way at work as well beilieve me i know we have so called mechanics that worked here just like him...........

[duke416ex]

I am in Kentucky, been here many years, never heard of you. Where exactly do you flat track at? I am pretty sure that there is a local that has been to most flattrack races around, he runs a ds650 with a stroker, maybe I can see if he knows you. Better yet, I did a little flat tracking last year at a local stock car track, ever hear of soggy bottoms, it's a 1/4 mile track, a little big, but still fun. If you think you might want to try this year give a post and I 'll try to line it up. So which one of your ten quads you wan tto bring, the 500cc 250x, or one of your many 450s? I prefer to see it in person than in a magazine.

[wilkin250r]

I don't know about building the 250x to over 400cc. Even if you could, it seems silly to me.

However, I HAVE heard of making the 250X into a 6-speed, and if memory serves, I don't think Spader's was the only one. I don't know the exact process, but I know it involves removing reverse, and replacing it with a foward gear, plus some other modifications to allow it to shift through the gears properly.

[oriclez]

I am sorry about that. When I said 50 HP out of a 350, I ment 350CI engine. Porting is easy horsepower for free.

[panteramatt]

Oriclez, just how old are you?Are you really young or just really stupid. First to say that TC is a junk builder is just nuts,Hes been around the business longer than just about anybody and has forgotten more than youll ever know.Second, the 350x head IS a 4 valve, do you want a pic I have one right here!Third, I will hand you my yfz450 if you can build a dyno proven 75hp 350x motor naturally aspirated! You have to be th ebiggest ***** Ive ever seen on here and thats saying a lot!:mad:

[oriclez]

You sir are a ****ing moron. When I said 350 I figured you acutually knew something about cars, my mistake. You are more of a idiot than I thought. What are you 15? When you can acutually drive on the road talk to me than. As for TC, they are decent. I don't consider any racing shop like them worth the money though is what im saying. I haven't been to impressed with there work though. Someone brought in a quad couple months ago done by TC. He had lots of oil on his spark plug. Your basiclly paying 2x the price for the name of who did it. Your local machine shop can order the same stuff of a different brand thats equally as good for half the price. They can do head work for half the price also.

As for the 350 I already said I made a mistake. I was thinking the warrior engine.

[panteramatt]

Im not getting into a shouting match on here cause it pisses me off when others do it, but just so you know,Im 27 and have been wrenching on my own bikes since I was 10 and I currently have 4 built bikes so there you go!:macho

[duke416ex]

a 450 for a 75 horse 350x, naturally aspirated, sounds like a good trade, what kind of dyno?

[Rich250RRacer]

Originally posted by dork
i'll add some more fuel to this fire...

tc built a 6 speed 250x for travis spader back in the mid 90's, i have a magazine article on it. i think that same engine also had twin lectron carbs on it. it uses the 250x cases, and had a custom intake welded for the carbs. its definitely a one off motor and not practical for anything but TT racing, but this was back in the 90's before the 400ex came out and the hottest new 4 stroke going was the 300ex.

the 350x topend was based on the 79-82 xr500 motor which was before the RFVC head design which came out on the 83 xr's. the 400ex is obviously based on this design. the 350x uses two rocker arms while the RFVC design is more complex.

FST had a 502cc 350x motor built with a 97mm piston on the stock stroke. do the math, it equals 502cc's. he also was running a xr500 non-RFVC head. now add a stroker to this and things really get out of control. i have his 92mm bore kit for my 350x that makes 452cc on stock stroke. case machining is necessary for the sleeve though.

Now we might have a little trivia going. Let's see how much you know about an XR500. I recently did a top end on one (81 model) for somebody and found something that you would never expect to see on this motor, in fact I don't think you'd ever find it on another 4-stroke. Do you know what it is?

[deathman53]

A reed cage?

[Rich250RRacer]

Originally posted by deathman53
A reed cage?

Very good.... you win a prize :devil:
I never really understood why though. Make your favorite parts guy lose his mind like I did, ask him for a reed cage gasket for one of these bikes. This is the look I got :huh

[86350x]

Lmao!, good thread:p

[dork]

here's part of the article with a picture of the 6 speed twin carb motor if anyone cares

[oriclez]

See this is where TC is wrong. He thinks only a few people could do a dual carb set up? Hes wrong. I claimed to be no master mechanic. I mean im 18 and working at a racing shop. I can do just as good port work as about any of these racing companys out there. The only thing these things require are money and time. Most of the limiting factor is money. I honestly could tell you any person that has went to a college like wyotech could pull off making a dual carb setup.

[ckasper18]

If i go back and start reading from the first thread you have been working on engines forever.Travis Spader did have a six speed tranny and dual carb set up because i was at several races in the early 90 91 92 and actually practiced with Travis.I raced a trx 250x for Curtis Sparks and that tc motor was fast.I was pretty fast myself i raced several races and was ready to race pro am and had a blood vwssil pop in my eye which caused me to go blind.Thanks to money the doctors experimented on me and i now have vision in one eye and ride every chance i get.Money can not buy you health but it sure can build one fast motor.

[Orr#34]

Originally posted by duke416ex
I am in Kentucky, been here many years, never heard of you. Where exactly do you flat track at? I am pretty sure that there is a local that has been to most flattrack races around, he runs a ds650 with a stroker, maybe I can see if he knows you. Better yet, I did a little flat tracking last year at a local stock car track, ever hear of soggy bottoms, it's a 1/4 mile track, a little big, but still fun. If you think you might want to try this year give a post and I 'll try to line it up. So which one of your ten quads you wan tto bring, the 500cc 250x, or one of your many 450s? I prefer to see it in person than in a magazine.

What part of kentucky do you live in because i make every big race in kentucky. but most of the time i only race at PIR. that is a 3/8 mile track it bigger than a 1/4. i also know of a guy who runs a big ds650. his name is kevin. is he is the one your talking about then he can tell you all about my 250x/350x quad and how it was travis spader and how i beat his ds650. I will bring what ever you want me to race it don't matter what i race anything i bring will whip your little 416ex. just for everybody's information mine does not have twin carbs it has one electron.

[duke416ex]

You assume to much, don't think that a 416 is all I have access to, trust me, I'm not worried. I live close to Bowling Green, and the guy I know is named Bobby Hooten. You may actually have what you say, and it may be badder than my 416, I would hope so for the money it would have ad put into it, but I can still ride my quad anywhere, trail, track, flattrack, street, whereever. You just need to realize no matter what you have, there is always something a little badder, it may be closer than you think.

[Orr#34]

Originally posted by duke416ex
You assume to much, don't think that a 416 is all I have access to, trust me, I'm not worried. I live close to Bowling Green, and the guy I know is named Bobby Hooten. You may actually have what you say, and it may be badder than my 416, I would hope so for the money it would have ad put into it, but I can still ride my quad anywhere, trail, track, flattrack, street, whereever. You just need to realize no matter what you have, there is always something a little badder, it may be closer than you think.

I know a hooten that races a ds650. he goes to some of the steve nace races that i go to. I think he has a white enclosed trailed with hooten something on it and he has a yellow ds650 and he has alot of red on it. but i have beat it too. I'm not saying that you just have a 416 to race i just don't have a 250x and 2 450R I have a coulpe more 250xs and 300exs and then i have 2 400exs. one is over a 500 it is around a 518 or something like that.then i have a 493 and i am building a 426 as we speak. so take your pick of which one you want me to bring.

[oriclez]

Im going to call bs on what you are saying until you get pics of all. You are beating 650's around a track? I wouldn't be to amazed with that. They aren't track quads. You easilly have 100 pounds off of them. Take it into dirt or dunes and your "250x" will get raped, if they have a decent amount of work done on them. I would be willing to bet my 300ex beating yours, if TC's work is like all the other 300exs I've seen. It sounds like he acutually spent a good ammount of time on that 300ex though.

[Orr#34]

Originally posted by oriclez
Im going to call bs on what you are saying until you get pics of all. You are beating 650's around a track? I wouldn't be to amazed with that. They aren't track quads. You easilly have 100 pounds off of them. Take it into dirt or dunes and your "250x" will get raped, if they have a decent amount of work done on them. I would be willing to bet my 300ex beating yours, if TC's work is like all the other 300exs I've seen. It sounds like he acutually spent a good ammount of time on that 300ex though.

So did i describe the right person and his trailer and quad? I was just wondering bet yes it does beat 650 around the track and what ever else. I wont be able to have any pictures until monday but if you go to www.stevenaceracing.com then go to the gallerys you will look at the last year and then you will find out all about me and my quads.

[Orr#34]

go to www.stevenaceracing.com and go to the photo album and click on PIR 9/03/04 and then click on show all and it is picture # 11. that is me on my 250x/350x that is a 465cc.

[oriclez]

I live up in Oregon. No clue about the racing down there, Ill check that out in a few. Gotta go and pick up a new battery for my truck right now.

[ghak99]

1 down 7 to go!;)

[ghak99]

There is no way you could prove your 250x is 465cc's other than TC's word or description, but I got to ask. Why a pink frame?

[duke416ex]

He has an enclosed, but I don't know the color. I think he does have red on it, but I'm not sure. He drives a green denali, I don't care what you bring. Take your pick, let's see how you ride take the sway bars off and run regular 18" tires, then lets see it. What part of KY are you from?

[honda250xrider]

Orr#34 have you ever personally went into the motor yourself? Or are you going by what the last person said when you bought the engine? because if you say you had travis spaders old engine, than i am almost postive that it was a 365 motor, if you doupt me then please go into the engine and find out for yourself. The 465 machines tc built was with the 350x engine not the 250x. I personally have a 406 and there had to be custom machining because of how much was needed to take off the walls of the bottom end, they had to somewhat rework the oil passages to let the oil flow right. So i am in serious doupt that, that motor was built to a 465.

[deathman53]

ok, I believe you that it has a 350x head, but thats a 250x cylinder cylinder, you can see by how much smaller the 250x cylinder is compared to the 350x head, I also have a 350x and the cylinder is the same size as the head at the top and it tapers down, but yours it just way smaller.

[Orr#34]

Originally posted by ghak99
There is no way you could prove your 250x is 465cc's other than TC's word or description, but I got to ask. Why a pink frame?

Don't really know why it has a pink frame but it was like that when i got it. So now around here it is called "Pinky". It has never been beat. even in a open four-stroke class. I have been into my motor and the cases are machined. I also have built a 410 ans i have a 435 out of a 250x, you also had to machine the cases to do them. If you don't beleive that then you can ask the man who built my 435 it was Mike at FDO. I know that it is travis spader's old bike because TC told me so. r you calling him a lier nope don't thank so.

[300exfast01]

Originally posted by oriclez
This idea is full of stupidity. I now remember why I left these forums. 99% of this forum is filled of stupidity. The 300ex has a 4 valve head. A 350x has a 2 valve head. Some idiot already made a mistake about this. The 350x uses bigger valves/flow design, but won't come close to what a 300ex with the proper headwork flows. You may be thinking why do companys put 350x heads on them than. Guess what? They want your money. They will make anything to get your money. No fast 300ex's would use a 300ex head. My 300ex rapes banshees, and by going to a 350x head my guess is I would lose about a 4-5 HP, and Torque to a stock head, and 2-3 HP and torque to a modded 350x head. how dumb are you? if a 350x has two head pipes it has to have two exhaust valves. take of a 350x head and look for your self:eek2:

[300exfast01]

Ya dumb ****

[2muchquad]

when i originally started this thread,i was curious to see if a 350x head would bolt onto 300ex cases because i read it somewhere.i didnt expect it to become so popular..:D so will they bolt up?im sure ANYTHING can be done but as for a simple swap?

[Out_Sider]

when ppl call ppl stupid.. maybe they should look in a mirror and say it again....:o

[oriclez]

Originally posted by 300exfast01
how dumb are you? if a 350x has two head pipes it has to have two exhaust valves. take of a 350x head and look for your self:eek2:

Like I said I mistaked the warrior's engine for the 350x. If you ever know half as much as me I will be astounded.

[sandspanker]

:D just remember when you point your finger at some one and call them morons/stupid you are pointing 3at your self:p :eek2: lol

[300exfast01]

If you are so smart you should know the difference between a warrior and a 350x

[86350x]

I read a few of these posts. Why not just take a 350x motor and drop it into a 300ex frame??? Its alread a 6 speed, and has alot of build up potential. I own a 350x and a warrior. It took alot of money to make that warrior run like my near stock 350x. They make pretty good power stock too btw.

Powroll makes a kit for the transplant, pipe included.

There's usually 350x motors for sale on e-bay every week. Would be alot cheaper then dumping thousands of dollars into a 250x, or a 300ex motor.

[Orr#34]

Originally posted by 86350x
I read a few of these posts. Why not just take a 350x motor and drop it into a 300ex frame??? Its alread a 6 speed, and has alot of build up potential. I own a 350x and a warrior. It took alot of money to make that warrior run like my near stock 350x. They make pretty good power stock too btw.

Powroll makes a kit for the transplant, pipe included.

There's usually 350x motors for sale on e-bay every week. Would be alot cheaper then dumping thousands of dollars into a 250x, or a 300ex motor.

It might be easier but the 350x cases are really weak. a 250x cases are a lot better.

[oriclez]

Originally posted by Orr#34
It might be easier but the 350x cases are really weak. a 250x cases are a lot better.

To be honest the casing strenght really doesn't matter. I'd rather have a strong cylinder wall than anything else, and even more so if you running anything with a boost. As for the 250X to 350X engine, I don't really know the difference between them to much off the top of my head. Probally a weight difference.

[86350x]

My 350x has been the most bullet proof atv I have ever owned. The only thing that ever went wrong with it was worn out o-rings on the oil cooler. I'd love to have a 91 250x with the blue fenders with a 350x motor in it.

Its a hill climbing mofo love everything about that motor.

[oriclez]

Oh ya. These engines are reliable if you take care of them. As long as you keep your oil good, carb and filter clean, they will outlive you.

[exman]

After looking at the picture of posted from article, this would be my assumption on it.

1. That is a 300ex 250x bottom end, side cases what ever and I am sure it could have 6 gears in it.

2. The rocker cover is a 250x or 300ex cover for sure, the 350x cover would have the engine mount bolt to the top (see mirophiche)

3. The head is more round on the edges than a 350x, meaning the 300 / 250x curves on corners more gracefully, the 350x curves but is more box type.

so just by looking at the pic i would make a valid assumption that, the engine we are seeing is a 250x/300ex engine, with custom made twin lectrons installed, redone 5 to 6 speed trans, and made to a 365 or something like that.

just my input and fact observation

[dork]

thats exactly what that engine is, a 250x with 6 speed and twin lectrons. but the fact still remains that tc has done the 350x top on 250/300x bottom ends.

[slamdak8782]

ok so im a little impressed about the 350x head on the 250x. Im amazed you punched a 250x that far but for petes sake this is one of the dumbest threads ive ever seen. A thinking person would ask WHY? Buy any of the new bikes and build them or even build a 250r. At least it would be awesome. I would laugh at your 465 250x.
Get on any of these quads z400 raptor 450r yfz450 and youll be saying this is the ****. Even an old 250r built for say 4000 could probably spank your quad with a reliable powerplant. big deal with enough money i could make a cavalier beat a zo6 but why it will never be a zo6?:rolleyes:

[snox31]

I sure hope it gets nice out , I am so bored I read through all of that name calling and *****ing. Go out and get some fresh air I am.

[K_Fulk]

Originally posted by slamdak8782
ok so im a little impressed about the 350x head on the 250x. Im amazed you punched a 250x that far but for petes sake this is one of the dumbest threads ive ever seen. A thinking person would ask WHY? Buy any of the new bikes and build them or even build a 250r. At least it would be awesome. I would laugh at your 465 250x.
Get on any of these quads z400 raptor 450r yfz450 and youll be saying this is the ****. Even an old 250r built for say 4000 could probably spank your quad with a reliable powerplant. big deal with enough money i could make a cavalier beat a zo6 but why it will never be a zo6?:rolleyes:

When most of these big and wild 250x or 350x motors were built there were no z400's, 450's and even the 400ex wasnt even out yet. There wasn't an easy or cheap way to have a fast 4 stroke in the 90's.

[fastkid400]

wow, i just spent the last 30 minutes reading from the beginning, and now im goin to bed.

[slamdak8782]

Honestly why would you want a fast four stroke in the early 90s This was the day of the 250rs They were the racers of that day and even now id rather have a badass two stroke than a four stroke. I have a 400ex that im putting a 440 kit in tomorrow and I would be done with it by now if it was an R. Four strokes for suck for multiple reasons.
1.More weight 2. harder two rebuild than 2 strokes 3. More maitenence required 4. not as fast 5. Sport models are uncomfortable now except for the z400
Give me the days of the 250s anyday.

[duke416ex]

One, generally four strokes reguire less maintenence if you take care of them, two, my 400 and a 450 are the most comfortable quads I have been on, three, this thread is a few months old, I had hoped it died and went far far away, let the subject go.

[slamdak8782]

Wait dude how many 350x or 250x do you still see runnin around. Also less maintenence. For real what kind f maintence is required on a 2 stroke no oil filter, no oil, no valve adjustments. When you finally do work on the thing all you have to do is put some new rings on maybe 1 time a year if you ride alot so im not seeing how there is less maintenence on 4 strokes. Plus Im sorry to diss a 450r but be honest does it handle better than a 250r or a 400. Seems kinda tippy to me and all diproportional as far as the way weight is on the wheels. But if you like being jipped ok. Im not happy with either of the new 450s I hope suzuki doesnt try to reinvent the wheel with their new 450 Hopefully they will stick with the z400 geometry that is actually from the 250r with the 450 motor. Honda would have been better off with a 400ex frame that was gusseted than what they came out with.