power!!

[Becareless06]

ok so ive got my jetting figured out and took the 300ex out riding this weekend ..
and the very first thing that came to my mind was i need more power.. has anyone
used the 330 kits on ebay with the nutrarama piston kits im afrade the piston kits are not as good as je ..ive also
got plans on a web cam with hard faced rockers.. but not sure what cam to get..
id like to have good midrange and top end power.. also got my eye on a sparks ported head with larger valves.. and a 400ex carb.. maybe a sparks pipe if i can find one resonable..
my question is dose it sound like im on the right track or is there somthin better out there..i just want a bad *** 300ex..

[laeger400]

I used to have a 300ex with the fst380 kit. The head was ported and polished with big valves and a 400ex carb. I also made a custom oil cooler kit and nicasiled the cylinder it was by far the funnest quad I had and would eat up 400 and 440 all day long. I ran a 15t front sprocket and 33t rear with a sparks modded cdi and a full whitebros exhaust. I will post some pics later tonight. I think that the 300 is a fun bike and with a little engine and chassi work they can be really fun!

[smr]

looks like you are on the right track.

I'm not a big fan of the big bore kits on a 300ex.

If you want to save a little money then have it punch out .080 over and go with that 400ex carb your talking about. That and a good pipe will do wonders on a 300ex.

laeger400 please post pictures of that quad. Sounds like you spent a lot of time and $ on a really nice build.

what size chain was you running? I've never been able to get a 15t sprocket to work on a 300ex.

[laeger400]

Originally posted by smr
looks like you are on the right track.

I'm not a big fan of the big bore kits on a 300ex.

If you want to save a little money then have it punch out .080 over and go with that 400ex carb your talking about. That and a good pipe will do wonders on a 300ex.

laeger400 please post pictures of that quad. Sounds like you spent a lot of time and $ on a really nice build.

what size chain was you running? I've never been able to get a 15t sprocket to work on a 300ex.

You got a pm from me. I never had an issue with over heating. I also used sidewinder chain and sprockets. Best $300 I ever spent.

[laeger400]

Janssen Motorsports ended up with the frame. It was a fun quad for sure. It's was 1 of a kind. Lol

[Becareless06]

wow thanks for the replys.. i think the 300 ex has great potential.. not that i dont like the 400ex but i want to be different i like the illusion of a smaller bike.. will be alot more funny when a lil 300 blew by a 400ex lmao.. ive got a supertrap pipe now but think the sparks is alil better .. im plaining on doin a oil cooler may even put a small fan on it to help the oil from breaking down so fast ..

[Becareless06]

can some one tell me if there should be exessive air coming out of the bolt hole for the fly wheel with the plug out ? or do i have a leaky seal..

[laeger400]

Here are some pics. Also I built this back 2003 so its been awhile.

http://i1109.photobucket.com/albums/h426/jdub160/380EX002-1.jpg

http://i1109.photobucket.com/albums/h426/jdub160/380EX003.jpg

http://i1109.photobucket.com/albums/h426/jdub160/380EX001.jpg

http://i1109.photobucket.com/albums/h426/jdub160/380EX004.jpg

[Becareless06]

sweet bike. man.. hope i can get mine looking that nice..

[laeger400]

Originally posted by Becareless06
sweet bike. man.. hope i can get mine looking that nice..

thanks dude I am building a crf 450 hybrid now but still always think about putting another 380ex back together

[Becareless06]

Where can u get the 380 kit at

[laeger400]

I got the 380 kit from four stroke tech. I also had them port and polish the head and put big valves in and the biggest cam I could get. I bored the cases myself and I modded the tranny and assembled the engine myself. The oil cooler I got from earls and made the steel braided lines also. I cut the front of the frame and redone the shock tower with 4130 round tubing and made to 250r specs. I also used 400ex pivot bolt and foot pegs and brake pedal this mod solved my wallered out holes in the frame. I also ran a modded exhaust. I did all the work except for porting the head and leeving and nicasiling the jug. You can see some of my work in my lsr crf 450 project in the hybrid section. I havent touched a quad since 06. Then out of nowhere I bought the one im working on. You really want that thing built send it to me and it will be off the chains.

[Becareless06]

what all do you do to the stock tranny to handle the 380 ..and are these big motors relieable.. in the woods

[laeger400]

there are thrust bearings in between the gears and you take it from one side to the other and lets 2nd and or 3rd engage better. its been so long i dont remember. i put all new gears in it when i built it. the biggest thing is you need to do a modded cdi and run 15/33 if you run mx tires and and 14/33-34 if you run woods tires. the bike is geared so low internally that it will over rev. thats why you run a tall sprocket gearing. it will still take off in 3rd with 15/33. it is a beast for a little bike. I ran 20/50 oil and changed the filter every time i road and changed the oil every other time. I road it for 2 years and just re rung once. very reliable. at least it worked well for me. like I said I always think about building another just because. lol

[Becareless06]

ok.. now youve got me wanting one of these big motors 380 to 390 cc ..

[smr]

Originally posted by laeger400
You got a pm from me. I never had an issue with over heating. I also used sidewinder chain and sprockets. Best $300 I ever spent.

Most likely you want if your useing it for MX. Most people are woods riders or even XC racers. I don't like the Big bore for those situations. You spent a lot of time and money made all the proper upgrades to complement your big bore. Awesome job. I was just giving him a more fessable option at a fraction of the cost.

That is one of the nicest 300ex's I've seen in a long time. I will try to post a picture of our last one.

[smr]

here is another, sometimes OMA would put the schoolboy and beginers on the same line. Most of the time holden would pull the wholeshot against many 450's. If the start was very long of course they would come back and get us.

[laeger400]

Thanks

[laeger400]

QUOTE]Originally posted by smr
I was just giving him a more fessable option at a fraction of the cost.

I acutally didnt have much in the engine build and the frame mods. I had 4-500 in the frame mods and probably 1800 in the engine. I bought most of the parts used. The rear shock axle and handl bars and gpr I bought new. I probably had 5k in the bike when done.

Thanks Jerry

[Becareless06]

well my first build prolly wont be the 380
but im going to go with the 330 with the sparks ported head withover sized valves web cam and hardend rockers with a full system sparks pipe.. with sparks cdi.

[laeger400]

Headwork is the most important.

[Becareless06]

Beadwork?

[laeger400]

Headwork! LoL

[Becareless06]

haha yea thats wat i thought..

[smr]

I agree to a point. I think the carb and exhaust is the most inportant but you do that and add the headwork, you will see some big improvement. What I really mean is, you will see a lot more improvement with your head work if you have the carb and exhuast.

Hey, If you need some shocks I think I have a set of 400ex, relocater and a raptor rear (2001 of course). I'd make you a good deal.

[laeger400]

The exhaust and carb will be an improvement but if you do a little research you will see. Air is what causes horsepower. The key is you flow as much air as possible and just ad enough fuel to keep it from blowing. Bigeger carb = more air, exhaust = more air ,and big valves and cam with port job = lots of air. You are on the right track for sure.

[Becareless06]

What kind of deal smr.. Pm me . I figure that about the power part but when you incress the
Bore you incress the torque and hp .. May not be as dramatic as the right cam and port work and carb amd pipe but all added together it gets me excited lol

[laeger400]

you put a big carb and better flowing exhaust on a stock head and valves and you start letting more air in then the head can flow and the better exhaust will have less back pressure. The best way is to do carb head and exhaust and that is you best power gain. a big bore kit adds hp but stroker kit adds torque. when I built my 380 it wasnt stroked just big bore so reved out real nice. At the time fst was offering 416kits for the 300 they where 380 kits stroked but i dont think they where as reliable.

[laeger400]

Ok all this talk has me going down memory lane and I found some pics of my 380 when it was all the way done engine case powdercoated and all. I will get them up as soon as my mom gets them to me. Also I am now on the hunt for a 300ex to build. I am close to being done with my crf450 hybrid and I am gonna build me another 380 after that. So as soon as I start the build I will post a build thread. This will be a sweet one for sure and one of a kind.

[Drfat400ex]

FMF PowerCore 4 with an FMF Hi-Flow Headpipe, UNI or K&N filter, rejetted and it will do wonders!!! BTW Don't buy a Naumoura or however you spell it piston, I have yet to hear anything good about them.