wiesco crank and piston

[jiffers]

do i have to use the 89mm piston that wiesco supply with there stroker for 400ex or can i use another companys stroker piston as i need to stay at around 450cc

jiff

[QUADMASTER]

not sure but if it was me.i'd use the wiseco.there really good pistons anyways.but it's up to you

[400exMO]

never use wiseco for 400ex. I'm pretty sure they just use the old xr400 pistons. Go with JE. They'll be made exactly for the 400ex