[Running a new CR 250 engine(02+) in a stock R frame] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

Pages:1

Running a new CR 250 engine(02+) in a stock R frame
(Click here to view the original thread with full colors/images)

Posted by: skibs

What is all your thoughts on running a more recent CR 250 engine in a stock gusseted mildly modified frame(non lonestar or other after market frame) i understand mounts are going to be diffrent and all also anyone else do

i'm thinking on buying a r and running a newer cr 250 engine(proablly off a wrecked Cr maybe from Ebay) just give me sume input on what you think and what processes it might take

I love 2 strokes so much to go to a 4 stroke

Posted by: nwi45

I'm hoping to do the same thing, but with a 4 stroke DB engine. Does anyone have any detailed steps on what is needed for this project? It will be going into a stock guesseted '89 frame. Thanks.

Posted by: zedicus00

dont do it. dirtbike motors arent counter balaned it will vibrate and eventually destroy the stock frame no matter how many gussets u put on. u can buy a aftermarket frame designed with the mounts u want with 250R geometry. otherwise buy a used powervalve kit or whatever it is u r wanting for an original 250R engine.

Posted by: nwi45

What is the difference between buying an aftermarket frame with the right mounts, or using a stock framing and adding the right mounts?

Posted by: skibs

that was stupid of me there is no diff i nthe frames really

i was hoping to do this to run a mur updated engine newer ignition and newer power valve design but I guess it owuldnt be worth it

Posted by: zedicus00

a lot. chromeolly is like 100 times stronger then a sqaure tube steel 250r frame. as for running an ubdated motor 2 strokes havent changed mutch over the rears. u r better off jus getting a powervalve kit for the 250R and being happy with it. or a big bore or whatever.

quote:
Originally posted by nwi45
What is the difference between buying an aftermarket frame with the right mounts, or using a stock framing and adding the right mounts?

Posted by: 2muchquad

go for it,it can be done.im currently running a 96 cr250 motor in a blaster frame but i will be doing the swap in a 400ex frame.anybody close to me(hubbard ohio)can come check it out.i have eaten banshees for breakfast,z400s for lunch,and i gobuy 416ex's like they are going backwards!i get a lot of looks from my nearly 50hp blaster...lol the mx motors just rip,not detuned for quad use like everything else

Posted by: riggsracing

Just look at www.servicehonda.com they make and sale kits. you would need custom mounts and a custom pipe and would prolly have to maike ur on breather tube and and use an 250r or 400ex air box.