General Jetting for Aftermarket pipes ?

Apr 11, 2004
23
0
What would be a good starting point on a 01' YZ80 with a pro circuit plat. pipe and a FMF powercore II silencer ? The jets are standard sizes from the factory . Just wondering if generally you go up on the pilot jet and main jet when you go to an aftermarket pipe or do you go down on jet sizes ? How much bigger generally , one ,two ,three sizes ?
Thanks,
 
Apr 11, 2004
23
0
what series of jets do i need to order ? there are so many ot is confusing and I have to mailorder and don't want to send them back and forth to get the right ones. There are like VM,TM,BS30/96,VM22/210, for the pilot jets and aren't there two different sized hex main jets ?
Thanks,

BTW: All i know for sure is that it is a 26mm mikuni ,has a hex main, and I need to tune it.
 

Patman

Pantless Wonder
LIFETIME SPONSOR
Dec 26, 1999
19,774
0
Talk to local shops and better yet people you run in to at the races / practice with similar bikes. Jetting is part black magic and part science which changes with the weather.
 
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