Yz400 with 450 carb

I've heard That the 2007 yz450f carb fits on the 99 yz400f. can somebody please give me instructions on tuning the carb to the 400 .I know it'll be a snug fit.

Edited by sy400

Tuning? Use the stock 450 jetting for the year model carb in question. It will be nearly perfect.

Cap off your existing hot start ports

The carb is slightly shorter front to rear than the original. Clamp it in the air boot first, then push it forward into the isolator/mounting sleeve and clamp it in place.

You will need the 450 throttle cables and the complete hot start/cable/lever.

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