406->416 jetting

[2001300exguy]

i have an 01 400ex with full hmf,aluminum air box,hotcam stg2, ported head, and it used to be a 11:1 wiseco 406. Ijust bored it out to a 416 and added a 10.8:1 je and didnt change anythign else. am i going to have to rejet?

[hondamanex400]

PROBABLY YES, BUT MAYBE JUST ONE SIZE UP. BUT I AM JUST GUESSING THOUGH

[GPracer2500]

Originally posted by hondamanex400
PROBABLY YES, BUT MAYBE JUST ONE SIZE UP. BUT I AM JUST GUESSING THOUGH

I'm inclined to agree with that.

[2001300exguy]

goinh to buy some jets today, just checking to see what sizes. im thinking a 165 and 170? sound good

[Buffalo400]

I have a little question for you? Why do you chage your piston from a wiseco to a JE? Did you have some problems with the wiseco?

[jsmith2232]

I have the same piston in my 416 and the jetting listed in my sig works awesome.