JD Jetting kit for a CRF450X, no airbox mod

OK, I just installed the JD on my CRF450X. I ride from sea level to 3,000 ft up. The bike is running rich, it fires right up when cold without the choke, and it gets like 4 MPG. I thought my buddy was playing tricks on me, and taking my gas. He wasn't.

I am running the recommended needle position on the red needle, using the stock pilot jet and a 165 main jet. I still have the CA smog kit on it, and I have NOT DONE THE AIRBOX mod. I am not interested in removing or modifying the airbox. I don't have the $ right now to blow on a smog removal kit just to keep it from popping on decel. So my question is, how do I jet for:

Stock 450X

No airbox mod

CA Smog kit installed

0-3,000 elevation

What main jet? What red needle position?

drop the main jet down to a 150.leave the needle and use the sticky at the top of the page to set up your pilto circuit.

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