jetting for 426 with fmf Q silencer

I just put a fmf Q silencer on my 426 and it is running way lean

I'm at 2000feet above sea level

I just wondered if anyone could tell me their jetting

thanks :)

I struggled with my 02 yz426 after putting on the Q.

@1000ft I found a 160 Main---1 3/4 turns on the fuel screw. Clip on the #3 slot of the jet needle seemed to work best for mine?

I'm no mechanic.....I had to keep changing settings...on and on till I got it right. I also had to clean the carb out real good. Make sure you go to your local dealer and get a cleaner that wont damage the internal rubber o-rings and excelerator pump diaphragm.

Good luck!

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now