250X High Comp. Piston

[stevengates45]

I have found that the 250X piston made by Wiseco is offered in a higher compression than the piston that 300EX piston. Remember though, the 300EX & 250X bore sizes are the same. Wouldnt the 250X piston work with the 300?? Anybody tried this?

[kc 300EX]

the bore sizes arent the same, the 300 is 6mm bigger than the 250, that makes the 250 a 68mm, and the 300 a 74 mm, i think

[stevengates45]

nope. only thing different with the 300ex & 250x is the rod length

[400exRacerX]

250x and 300ex have the same bores, just the 300ex is the stroked version of a 250x.

[tinner]

I don't think it will work. The piston height will probably be different and may cause valve/piston clearance problems or the piston may sit lower opposed to the 300ex piston lowering the compression anyway. I wish Wiseco made a lower comp. piston than the 12:1 ...it's not practical for me.

[kc 300EX]

Wiseco's pistons are mostly 11:1 i believe, and on moto-man.com im pretty sure they sell some 10.5:1

[tinner]

When I looked in the Wiseco catalog they showed one piston for the 250X and it is a 12:1 piston, and unfortunately that is the one I have. I may look into what JE has to offer.