250EX Big-Bore Kits??

[Fast250EX]

Does anyone have any idea where I can find a 250EX big bore kit? I don't mean like going from 229 to 250cc but more like up to 310 or 330. Even if it doesn't go up that high, do you know of a kit that would make a largely noticable difference. (as in, hard to keep the front end on the ground). Thanks, I have checked a lot of places but I just don't know where to look. :D ;)

[Honda2003]

i've been looking also. the only thing i've found is this site:

http://www.powroll.com/honda_trx250ex.htm

i know it's not what your looking for but it's all i've found so far.

[DaveEX7]

thats what i was lookin for, somethin around there.. mabe il get it... hey its 20 more ccs ne way

[250exparts?]

Saw that whitebrothers had some kind of power kit for the 250ex. Looking for it now. I'll post a link if I find it.;)

[250exparts?]

Found it. http://www.whitebros.com/OffRoadSections.html You have to have adobe acrobat to read it but click on atv engine and there it is.

[DaveEX7]

sorry wrong about that WB powerkit, read the year it says 87-92(thats the 250X not ex) and it says all around cam, i dont think ur gonna change the drive of the quad (shaft-to-chain)

[250exparts?]

Sorry you are right. It said 250ex and I just didn't look at the year. I'm kinda new to this and mine is still stock. I'm looking everywhere for parts. I thought the 87-92 was a 250r though?:confused:

[Elmo0nTHC]

not be sound like a dick but its senceless to put so much money in a 250EX there not to many parts for it and plus why bore it to a 300 when it has a auto clutch?. With the money its gona cost to bore and mod ect.. why not just sell it go with out a quad for a week and buy a cheap used 300?

[DaveEX7]

well the reason i got a 250 is because the 300 sounds like a girl when it idles, got crappy ground clearence and suspension, and handles alot better, also it fits me alot better cause the 300 is too low to the ground, so i can spend less money for the quad i like to buy, and put the rest into the 250

[rider250ex]

i like my 250ex for the price. it is a fun quad and it can go through anything. i got through places a prarie 300 4x4 couldent get through yesterday. plus spendin the same amount on parts on a 250ex as it costs to buy a new 300ex will get u a good soundin quad that has parts that will last longer and u dont have to worry about stallin on a hill or anywhere. just my 2 cents

[Honda2003]

i love my 250ex. everybody mods out 300-400ex's (nothing against the people who do).

[redroost85]

I agree with Honda2003, rider, and speeddemin, I love my 01 250ex! Yeah, who wouldn't want a 400? But I looked at the 300 and thought the 250 would so be the better bet. Man, am I glad I went with the 250! A little known (I think) fact that, for what it's worth, the 250 is manufactured in the states (mine from South Carolina) and the 300 comes complete from Japan. That is what the guy at the Honda shop told me. For what it's worth, my 250 gets a lot of looks from other riders. They can't believe that it is shaft drive, clutchless, etc... Of course, mine is pretty pimped out...that helps! So to answer the question, hopefully after the new year I will ad the powroll kit to my 250.

[Steve-o 400EX]

My 400ex was made in SC. I like the manual clutch and the bigtime power. I dragraced a totally modded out 250EX two weeks ago and smoked him, my 400 is stock at the moment. He pulled up and actually thought he had a chance.:huh I guess some people just overestimate their machine.:rolleyes:

But its all about what your needs as a rider are. Its your choice to buy the machine that will make you the most happy, just dont pull up next to a 400 and try and make a run with em, cuz it wont happen.

[redroost85]

Steve, I am glad that you are happy with your 400. One day maybe I will buck up for one. I am not overestimating my machine in the least. I know it is not comparatively fast at all...but it is not the slowest either. Does it have a shot at a 400, heck no...but who cares. I will agree that some have no freaking idea what their machines can and can't do. All I am saying is that the 250 is is cool machine...and so are the 400's. ;)

[DaveEX7]

i agre with redroost, it really dont matter to me cause who cares whos quad goes faster (not to brag but the only faster quads around here that beat mine are my friends 400-stock, and my friends blaster-juss a pipe), because where are u gonna go 50-60 mph around here, except if u go to a track.... i like to mod up my quad because as u get bigger, u need the more power, im not tryin to say im gonna smoke a 400 one of these days but u get the picture

and about the big bore kits.... try motoman.com, or west coast atv

[CG's]

Why would one save their money and sell a very nice 250EX for a used 300EX that will be no faster (stock) than there original 250EX. I have a 250EX (100% stock) that will easily keep up with a slightly modded 300EX. He has a KnN Filter with 18" rear tires and it's also regeared, both quads are equal. Also one can buy a better stronger auto-clutch. Just a thought.

[RideRed04]

I believe that fst makes a manual conversion kit for the 250ex too. I know they make one for the wolverine, and it is about $75. Something to consider if you want a more reliable drivetrain, and more importantly a more fun quad.

[Honda2003]

RideRed04 whats the site for fst? i like not having a clutch lever to pull all the time. all i do is shift. and if a want to rev it up and dump the clutch just lift up on the shifter a little, rev and let go of the shifter. almost flipped over backward the first time i did it.

[rider250ex]

are u sure??? whats the web site. i can see them makin one for the wolverine seeing it is just like the worrior, but there is no place to mount a manual clutch on the engine of a 250ex

[kxrider]

ok heres the deal everyone of us with the 250ex, we know that it will never beat a 400ex, but we put all our mods on there, not to make it fast, but to make it faster, i have mods on mine, and theres nothin i love more than drag racin my friend with a 300ex, with pipe, filter, jets, and beatiin him, or goin ot the dumes and beatin some stock 300s, or that is y i do it :D

[loganB]

There us a guy that board my das recon to 300 and he machened the piston at the lockal tech school but he dosent do it eny more becase it took him to long to make the piston.:)

[RideRed04]

The 250 already has a manual clutch on it. When you pull up half way on the shifter, that disengages the clutch. The centrifigul clutch keeps it running at idle. The kit removes the c-clutch and puts a lever on the manual one instead of the foot shifter. Getting rid of the c-clutch also makes it rev quicker because you have less rotating mass.

[01TRX300EX]

SpeedDemin85, did you just say that the 300EX has worse suspension and handling than the 250EX? First off what do you ride on, smooth roads? And if you ride in the trails or something that actually tests the way a machine handles, then I want what your smoking that makes you think the 250EX handles better or has better suspension. I have nothing against 250EX's, I love riding my brothers, but in no way do they have better suspension or handling than the 300EX.

All that you have to do to get rid of the clutch disengaging is decrease the play in the clutch.Their is a nut on the front of the engine on a 250ex.All that you have to do is decrease it and it will not disengage anyone.I did that with mine.

[kxrider]

whoa whoa whoa, 01 250ex, explain more wat ur talkin about

[Syrus]

I have a 01 250ex. At first i was gonna buy the 300ex then i took it for a test ride, brought it back after about 10 seconds into the test, i didnt like it at all.. for many reasons, to name them it would take a while. Dont get me wrong now, the 300 is a great bike, just somethings are bad on it, and set really stupid.. (dont get me started on the reverse leaver !) The 250ex is a great bike, lots of power and stock i can beat my friends 99 300ex lol.

The 250 is a great all around bike, im either going to move upto a 400ex next year or start putting on the mods. I would have started that already.. but im at the age where i also have tp pay for my licence, and my car at the moment so its taking a solid flow of cash outa the bank.. and not to mention my dads wallet lol.

Anyhow, im happy to see the collection of 250ex riders here, when i first signed up here i though i was the only one.. guess not lol. Also if anyone lives in Ontarion Canada, that would like to get together for a eide sometime soon just email me at critical_point07@hotmail.com and see if we can get something going !

i used to be one of you guys tryin to stick up for my little 250 when people talked how small and powerless it was, i bought a 300 and owned both at the same time. u guys that say your 250 will beat a 300ex are lying. unless tim farr gave u personal lessons u are straight lying. and if by some chance u are telling the truth that 300 must be ragged out. my dad smoked me on the 300 when i rode the 250 and he ways 90lbs. more than me. and the 250ex suspension is really *****ty. the 300 is better in every way shape or form. i sold my 250 and dont miss it a bit. but i believe that everyone should ride what they got and not worry what anyone thinks of it. i just cant set here and let u 250 riders (i used to be one) say your beating 300ex's cuz that aint true. 300 guys back me up there is no way. just expressing my opinion

[Sportrax10]

Originally posted by atv_king300ex
i used to be one of you guys tryin to stick up for my little 250 when people talked how small and powerless it was, i bought a 300 and owned both at the same time. u guys that say your 250 will beat a 300ex are lying. unless tim farr gave u personal lessons u are straight lying. and if by some chance u are telling the truth that 300 must be ragged out. my dad smoked me on the 300 when i rode the 250 and he ways 90lbs. more than me. and the 250ex suspension is really *****ty. the 300 is better in every way shape or form. i sold my 250 and dont miss it a bit. but i believe that everyone should ride what they got and not worry what anyone thinks of it. i just cant set here and let u 250 riders (i used to be one) say your beating 300ex's cuz that aint true. 300 guys back me up there is no way. just expressing my opinion
:huh :huh :huh
You bash the crap out of a 250ex and then you go on to saying that you belive that everyone should ride it no matter what anyone else thinks of it? Im sure a 250ex is better then the 300 is a lot of ways, like the reverse lever on the 300ex or the looks.JMO

im not bashing, i owned one and i loved the damn thing, all i am saying is that the 300 is superior in all components, ok except for thr reverse lever. but performance wise there is a difference. just chill out for youy start somethin unneccessary:D

[flyin#5]

if you guys want some bore ups for the 250ex do a google search there are a ton of em.

[Syrus]

Originally posted by atv_king300ex
i used to be one of you guys tryin to stick up for my little 250 when people talked how small and powerless it was, i bought a 300 and owned both at the same time. u guys that say your 250 will beat a 300ex are lying. unless tim farr gave u personal lessons u are straight lying. and if by some chance u are telling the truth that 300 must be ragged out. my dad smoked me on the 300 when i rode the 250 and he ways 90lbs. more than me. and the 250ex suspension is really *****ty. the 300 is better in every way shape or form. i sold my 250 and dont miss it a bit. but i believe that everyone should ride what they got and not worry what anyone thinks of it. i just cant set here and let u 250 riders (i used to be one) say your beating 300ex's cuz that aint true. 300 guys back me up there is no way. just expressing my opinion

Are you saying im a liar ? Cause if u want you can ship your *** over to Canada and i'll show you how bad i can eat up my buddies 300ex.. and im all stock sofar. Dont diss the 250 in any way unless u want me to start cutting u up about your 300...

[Juggalo]

the powroll kit is the only big bore i have ever heard of for the 250. problem is it only makes the 250ex a a true 250 (stock cc is 230, the kit increases displacement 20cc). i have to agree tho dumping a lot of money into the 250 is pointless. you 250ex riders need to get a clue, the 300 is better than the 250 in every way. i'm not bashing your ride but you shouldn't try to turn it into something its not. its a beginners quad and it always will be and its pointless to try and change it. besides if you were so happy with your 250 why are you trying to get more power out of it? i know the 250 is a nice machine but just let it serve its purpose. if you had a geo metro would you try to make it fast and handle good or would you just buy a better car for what you want?

[DaveEX7]

why would i save my money to buy a 300ex?? if im gonna buy nething next its gonna be a banshee or 400ex, my 250 now smokes the 300s around here so im not gonna buy somethin slower than what i already have

[TRX_Thumper]

why would i save my money to buy a 300ex?? if im gonna buy nething next its gonna be a banshee or 400ex, my 250 now smokes the 300s around here so im not gonna buy somethin slower than what i already have

haha oh boys i aint laughed so hard in a long time....haha maybe your just the better rider..imagine what u could do on a 300ex...haha u might be able to take a 400 on a 300 LMAO

[True rider]

My 250ex kicked ***, went every where and is a reliable well handled machine. I've beatin my share of 300exs and blasters, But after i sold it i would never buy a 300ex 50cc's more come on, The only thing 300's got going for them is performance, more power but for there msrp of around 4800 g's i'd rather have a 250ex. There a pos as far as i know my friends sucked a valve and blew a top end and its a 2002!

[DaveEX7]

Originally posted by TRX_Thumper


haha oh boys i aint laughed so hard in a long time....haha maybe your just the better rider..imagine what u could do on a 300ex...haha u might be able to take a 400 on a 300 LMAO

like true rider said, its only a cc displacement difference of 50cc's... wow 4 friggin more mph, im neck and neck with my friend on his brand new 400, as soon as i get my carb and piston, hes gone, so im happy with my machine

not that thers ne thing wrong with 300s, there a nice bike, ive ridden them b4, but im not gonna sell my bike now with what i have on it to go 50cc's more

[TRX_Thumper]

yeah your right 4 mph...yeah u got a point...250 is cheaper in price..but when it comes down to potential..say u put 6000 into each including cost of bike at msrp...the 300 has so much more potential...manual clutch....4valves verses 2...overal chassis design is very close to 250r/400ex....the 300 has the ability to change gearing via sprockets...its all goes down to you get what you pay for...if buying new an keeping stock...but still guys...dont be sayin your 250's beat 300's...sure my 300 will take a 400..with a 4 year old drivin the 400

[Honda2003]

i like my 250 because its shaft drive. i don't have to p!ss around with adjusting the chain all the time. IF i ever sell my 250 it well be to get a 400ex. i'm with SpeedDemin85 i'm not gonna sell my 250 for a 300 thats only 50cc's more. i got my 250 because i'm new to the atv thing and wanted something i could just get on and ride. being a newbie a clutch level is the last thing i want to p!ss with right now.

[TC17]

for my b-day in march, before race season, i might get bigger sleves and bore it like 50cc or something, maybe more. it depends on how big the sleves are and how big i can get them without being too big. do you guys have any suggestions about buying bigger sleves and boring it up?

[TC17]

i also love the way the 250 sits. it fits me perfect. it feels like it was made just for me. i love my 250. i don't need a big qud to have fun. 250 is all i need right now. piped with an air filter and some other mods too.

[RideRed04]

Originally posted by Juggalo
...if you had a geo metro would you try to make it fast and handle good or would you just buy a better car for what you want?

Well, some people...hehehe

http://www.superhonda.com/images/rides/feb02/Tha%20Fast%20And%20The%20Furious%20Honda%20Civic.j pg

[Juggalo]

sport compacts are gay anyways. anyways the 300 is actually about 70cc's larger. also the 300 has a sohc not a pushrod motor like the 250. 4 valve, better suspension, more potential, and people who say they don't want to mess with a chain are idiots, tightening the chain takes about 2 minutes and you barely ever have to do it. the ability to change sprockets and the fact that a chain has less rotating mass far outways the fact that it is slightly more maintinence.

[Honda2003]

somebody better get there facts straight. if you check the stock specs. on the honda site the 250 is 229cc's and the 300 is 282cc's, thats 53cc's differance not 70cc's.

[TC17]

Originally posted by Honda2003
somebody better get there facts straight. if you check the stock specs. on the honda site the 250 is 229cc's and the 300 is 282cc's, thats 53cc's differance not 70cc's.

yeah, you're right. i doubt that there is much of a difference of only 53cc. with my pipe and K&N i would think that my 250EX would keep up with a stock 300EX. am i right? am i wrong? i dunno. i heard with the pipe and filter i'll get like 5 more horsepower. the 300 handles better but i'm getting wheel spacers so i think that i'd keep up with a 300EX besides the shocks.

[TRX_Thumper]

the 250's will never have a decent speed...cause you cant gear em up...if you put 25's tires on the back ...it'll hit the fenders and will be tippy...so what if u can take a 300 with a pipe an filter ....do the same to the 300 and your whipped again

[Honda2003]

i don't race. all i do is trail ride so not having the top end speed don't bother me. when i get some 20's on the rear and a pipe and rejet it will have all the power i need. i'm sure the 300's are good machines. it's just that i couldn't justifie (sp?) spending the extra $ on a 300 for what i wanted it for.

[DaveEX7]

Originally posted by 2003TRX250EX


yeah, you're right. i doubt that there is much of a difference of only 53cc. with my pipe and K&N i would think that my 250EX would keep up with a stock 300EX. am i right? am i wrong? i dunno. i heard with the pipe and filter i'll get like 5 more horsepower. the 300 handles better but i'm getting wheel spacers so i think that i'd keep up with a 300EX besides the shocks.

u will be able to keep up with, and beat a 300ex because my friend that i told u has the crappiest pipe on his quad that everyone says is the best, and a k&n filter, still beat my friends 300

ive riden a 300 b4 many times, and i dont like the way it handles, its not my first choice but i still love my 250 as well, but il be getting rid of it in the spring for somethin bigger like a warrior, 400, or a banshee

[01TRX300EX]

OK first off, there is something wrong with your friends 300EX. The 250EX does not stand a chance, they may only be seperated by 4 mph, but the 300EX gets there a lot faster. And I can see how you wouldn't like the handling of a 300EX, I mean who wants a more stable, better suspended quad :rolleyes: . But like I said, I have nothing against 250EX's, I love riding my brothers, but even he knows better than to race against me.

[Dudefire607]

I beat my buddy yesterday in two outta three drags. He was on a Green Machine and I was on a Big Wheel. I would have taken him all three times but I got a flat spot on the front tire after skidding to a stop on the second drag. :rolleyes:

DF...

[SpeedBump]

Hey, don't blame the kids for not knowing the facts. They are just kids after all. You will not beat a stock 300ex with a highly modded 250ex let alone a stock or close to stock one. I understand you are trying to be cool and all, but really, who you trying to kid? ANYBODY that has half a brain can tell ya the outcome of the race.....250ex vs 300ex. Heck, you can't even beat a 10yr old 250x with a new 250ex. same cubes, just made to be faster. Your 250ex is just a RECON with sporty plastics and a slightly better tune job. If you putin some time on a 300ex you would definitely see the difference. Oh ya, don't bother buying a yamma warrior. A 300ex will beat it in every catagory except drags.(btw NOT be very much stock, and with a few mods, the EX will beat it) If you want to jump up to a bigger machine, BUY A 400ex. I see them in our local paper everyday for $3000-$4000, and some can be scraped up dirt cheap. My buddy just picked up a real nice 2001 400ex, hi-comp piston, cam, k&n, jet kit, $2500.00 Great deal. Good luck. oh ya, "You Can Only Polish A Turd So Bright!"

[300exracer]

I drag race my 300ex and the last drag race i was at i got first out of ten quads with allot of luck. I beat a 250x, 250ex, mojave, blaster and i cant remember acouple. And when i beat the 250ex my quad didnt have the slip on or the jet kit and that 250ex had a T-4 exhuast and i still smoked him.:)

[duneittilludie]

the powroll kit is a very good choice .if you go to the powroll site at www.powroll.com you will see pictures of a 250 ex ,that bike was my wifes and it really flew after powroll did their thing to it.we later sold it only because my wife now rides a 440 ex but that 250 was very fast and ran perfectly.the pipe that they sell with their kit is a good addition to the big bore kit they sell.i can tell you that we did a few drag races against what was my stock 400 ex and that 250 would keep up with the 400 until i hit the top of fourth gear and then the 400 would pass it up.that is very good performance from a 250 four stroke.i would suggest calling powroll and talking to them,i think you will find they are a first class operation.

[DaveEX7]

im not picken sides here but after riden with my friend and his 400, i think the 250 sucks, i mean really bad.... he flies up a hill and i try the same one, its not even that steep and i get stuck rite in the god damn middle of it and he stops rite in the same place to help me then without rolling back down he juss keeps goin

after that experience(which happened more than once), i am gonna go with my new 400 in march and trade in the 250, cause i used to love my 250 but now i need somethin with more power

i felt pathetic today, i went riden today with my friend and his new 400, and we met 2 other kids on 400s and they were climbin hills havin a good time, and all i could do was watch cause i didnt have that power the 400s do to make it up those steep hills, so whike they were havin a great time, i was wanderin whether to climb a measly 40 foot hill...... but i definately need somethin bigger than my 250 now

[True rider]

Man i was spankin up 300ex's with pipes air filter jet kits you name it there not that impressive. My 250ex was a bad ***** bike i loved that thing, best all aaround bike and pretty fast. I dont know whats up with your 250 speeddemon but mine would take hill climbs like nothing, and that was when it was stock, after that i put some 20 inch tires, K&N AIR FILTER, Pro circut slip on, and a jet kit that thing was a ride. i was keepin up with all the warriors and blasters, pullin 3rd gear wheelies you name it I did it.

[trueblue450]

Originally posted by 2003TRX250EX


yeah, you're right. i doubt that there is much of a difference of only 53cc. with my pipe and K&N i would think that my 250EX would keep up with a stock 300EX. am i right? am i wrong? i dunno. i heard with the pipe and filter i'll get like 5 more horsepower. the 300 handles better but i'm getting wheel spacers so i think that i'd keep up with a 300EX besides the shocks.

First we are talking about boring our 250's up 50 cc's cus it will be way faster.

then when we talk about the diff between the 250 and the 300's, 50ccs isnt a big deal???

THEN WHY BORE YOUR FREAKING 250 OUT 50 MEASLY CC's.. idoits.. haha :huh

[250EXrider2533]

i have a 250ex and my friend has i think its an 01 300ex and it has a pipe and jets and i can keep up with it while mine is stock..it all depends on who the rider is..you cant forget that because you can have the worst rider on the 300 and best on the 250 and who do u think will win?? but i do have to admit even though the 300 isnt much more cc's than the 250 it is still a better/faster quad but in a race it just depends on the mods and rider..

[hondaracer2001]

well guys i got a 250ex also and i am able to stay up with and smoke a 400 eiger ....and all i got is 25/12/9 tires on the back and a filter...seriously the 250 isnt that bad ....

[kxrider]

let the thread rest in peice ha ha, jk

[deathman53]

you 250ex guys must be doing some serious drugs, I kill them regularly on my 86 atc 200x, a 300ex will easily beat them, simply because you can gear up the 300ex as you add a pipe or something, put 18' tires on it without losing your topend, etc. Its close as to what has better suspension, both are not very good. I rode with my friends, one had a 250ex, another 300ex, blaster, I had my atc 200x and 85 atc 250r with me, my trikes were killing the whole bunch, and what was consistantly in last......250ex, no matter who was riding it. we were doing a series of jumps and berms at a pit as kinda like a track. my 250r was constistanlly in first, then came my 200x or the 300ex, the blaster was close and the 250ex never stood a a chance. Oddly the guy who had the 250ex rode my 200x and made a comment "wow, this is fast, much faster than my bike". you 250ex guys need to get out of your private 250ex cloud and realize that they are slow, handle bad, way too narrow,have horrible stock tires.
As for you guys that buy into a powerell big bore kit, its really a 120 over piston, that leaves you screwed on rebuilds, yes the cam and different rockers could make a difference, but to be honest, the bore kit, pipe, filter, cam, rocker arms seam like a alot of money into a hopeless machine that you can't make the mods work good, as you can't regear it.

[dman250]

I am a short rider 5' 1'' but my 250 has a bunch of aftermarket parts I can handle it fine but i want more power, the poweroll kit is only 20cc and 300 bucks, if anyone finds a kit with more power if anyone gets any info pm me

[Xater]

ill sell you my blaster ;)