Hey im looking for the biggest piston i can to bore out my kfx400 the biggest one ive found was a wiseco piston that bores it out 40 i was kinda hoping to find a piston that bores it out 70 if any one knows where i can get a big piston let me know

 

Well a big piston ain't gonna do squat unless you bore/re-sleeve the cylinder to make it fit!!! You cant just jam a bigger piston into the original cylinder without modifications. But if you already knew this...FST (Four Stroke Tech) has a 500cc strroker kit which is the biggest I've seen so far,but maybe there is a bigger kit. Thumper racing also has a 470 big bore kit which is relatively cheap.

 

hey i knew that i needed to mod it to make it fit but i just wanted to find a big piston i think ill take a look at that 500 thanx