I race moto x and I already have my 2 stroke quad built.. a shee. I just bought a 250r that is built to the nuts except the motor. I am interested in branching off into the 4 stroke class as well and I want to put a 400 ex motor into the chassis I have. Can anyone give me any info on this swap, Thanx

 

You should be able to keep the R swing arm. All I can really tell you is make sure the sprockets are lined up and make some mounts. You might have to cut and reweld some of the tubing if I'm not mistaken. I heard a guy tell me this when he put a 350X engine in an R frame. Don't quote me on it though I could be wrong.

 

Here is what ya do:: ride that arens 250R as is. After a couple races that arens frame will need alot of re-welding for all the breaks,while it's getting welded have the x mounts welded in [img]i/expressions/face-icon-small-tongue.gif[/img]