will i need to rejet????????????????

i just purchased a 04' yz450f, i am putting a fmf factory 4 full exhaust system on it and also a twin air air filter. just wondering if i will need to rejet to make everything work well together???????

I put my Akrapovic full system on and it runs awesome with stock jetting/stock air filter . I believe that FMF has jetting info on their website though .

thanks!!! ill check that out

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