300cc 250sx??

[atc500x]

I was wondering if someone ever try to install the complete top end setup from a trx300 (not 300ex) on the 250sx,the top end look like to be the same except for the 300cc.The engine is very very similar....

[SCRAMCHARGER318]

yes someone has tried and yes it can be done, search for the thread 300sx and you'll find a guy who did it to his sx and it tell's all you have to do if you want to do that swap.

[Yamada]

I think is screename is Jason T. He installed a complete TRX 300 engine in a 250sx

[dogger]

if I'm not mistake the 300 and 250 have different strokes.

[SCRAMCHARGER318]

yes they do have diffrent strokes, same bore, but diffrent stroke. that's why there's no sense in just changing over the top end, unless you want to run a high comp piston they're easier to find for the trx 300, HOWEVER you can note use a 300 piston in a 250 becuase of where they placed the wrist pin, if anyone out there has a 2wd trx 300 motor i'm lookin for one to put in my sx.

[smvorndran]

if anyone out there has a 2wd trx 300 motor i'm lookin for one to put in my sx.

Come on. Get a 4WD TRX300 motor, and build a 3x3!! Now that's a project!

smvorndran