well i have a 2001 250EX, you can see what mods i have below, do u think if i put a pistin in it(not bigger bore just high compression piston), like the piston 4stroke tech offers, how much more power would that give me, or any?

 

i think what u need to do buddy is to sell that thing

 

Build a four stroke big or dont build it at all!!!!!! I put a cam, wiseco piston 10:1, and different valve springs, and wasnt impressed at all. it was bored 10 over. Just build it big if you are going too!!!!