406 piston ---how much horsepower?

[barbwire44]

I was thinking of putting the 406 je piston kit in my 400ex the only mods so far are fmf powercore,uni filter, uni vents,and new jets. I dont want to add a cam because of the rocker horror stories ive been hearing about and dont want to spend the extra cash yet. Does anyone have an idea on how much of a horespower increase i will see by just adding the piston to the mods ive got now. Or not enough to bother with?

[kat400ex]

i have the 416 which is just bored over 80.....and its awesome..my husband put a stock bore JE 10-8to 1 JE and he could tell the difference too.....amazing what a piston can do...good luck marcumsatvs@hotmail.com can also help you