cr 125 motor in a 250x 4 wheeler?

[05Special]

my buddy has a 250x 4 wheeler with a blown motor, he has trouble keeping up to the shee (of course) haha but anyways he use to have a 250r and misses the 2 stroke. We were thinking of swapping a 2 stroke in, well not thinking, where gonna do it just a matter of finding the right motor.anybody know info on the swap? if i could find a 250 its be even better but a 125 running for 300 bucks is decent. any info on this would be greatly appreciated.... thanks

[bansheefreestyler]

talk to loco about it

[rocketboy]

i would think youd be alot better off witha bigger displacement 2 stroke motor ,the 125cc

would struggle ina quad frame and have to be consatntly in top rpm to make the power

to propel your ass,plus the tranny and clutch are not of the heavy duty variety that will holdup over time on a 125cc motor ,the 250 is a much better candidate ,my .02

[05Special]

we were even thinking of a late 80's 500, i fi can find one cheap its goin in hehe

[racer]

locogato seems to know a thing or two about large late 80's 2 strokes. PM him. or do a search in the image forums for CR500 banshee pics. thats his quad, that he built. hes pretty smart.

[sp1tekiller]

we were even thinking of a late 80's 500, i fi can find one cheap its goin in hehe

331547[/snapback]

That is suicide in a 250X frame. Try it in a 250r frame or Banshee. The 250x is too short and small.

[racer]

why a 2 stroke? he may be better off to ditch his 250x and get back into a 250r.

[jinx44]

The 350X transplant would be the easiest swap. Powroll still makes the kit to do it.

 

I have a BB 250X engine for sale. 273cc, 10.5:1 compression, fresh topend, oversize valves, Powroll billet steel cam, RD springs, FTZ ported. Complete engine for sale PM me if interested.

[locogato11283]

locogato seems to know a thing or two about large late 80's 2 strokes.  PM him.  or do a search in the image forums for CR500 banshee pics.  thats his quad, that he built. hes pretty smart.

331613[/snapback]

haha yes cole i am smart. personally i would never bother putting a 125 engine in a quad frame. they have a hard enough time pulling around a 220 pound dirtbike let alone a 300 plus pound quad. if you wanna go single cylinder 2 stroke i would say find a used 250r engine. they are easy to come by and easy to get parts for cheap. you could always go with a 500 engine but they are alot more money even for a used one and im not sure that frame could handle it...

[trail rider]

There is a boy in my welding class who put a yz 490 engine in a blaster. He's a good welder so it wasn't to hard for him to make the engine mounts and stuff. When I first seen it I thought, thats one big blaster motor, Then when I found out that the yz 490 was air cooled, I was like wtf? The two motors almost look exactly the same, except the 490 is alot bigger and has a bigger pipe (almost the same shape too).

 

I haven't seen it run yet, I think he has a few things to fix on the throttle or carbs or somethin? I'm sure it will be one hell of a ride

[sp1tekiller]

There is a boy in my welding class who put a yz 490 engine in a blaster. He's a good welder so it wasn't to hard for him to make the engine mounts and stuff. When I first seen it I thought,  thats one big blaster motor, Then when I found out that the yz 490 was air cooled, I was like wtf? The two motors almost look exactly the same, except the 490 is alot bigger and has a bigger pipe (almost the same shape too).

 

I haven't seen it run yet, I think he has a few things to fix on the throttle or carbs or somethin? I'm sure it will be one hell of a ride 

331786[/snapback]

Sound's like a killer bike. I almost bought a YZ490 once, they are a hella fast bike.

[rocketboy]

the old 490's have a very small squash band clearance and will grenade topends until you have the head professionally rechambered!!!! just a heads up its a high compression motor stock too!