big bore jetting help

I am putting an Athena big bore kit on my 2006 KX 250F. I will probably have to change jetting. Has anyone done this mod and know what jetting to use??


It will be trial and error but here is what I am running on my 07 with Hot Cams.

178 Main

45 Pilot

JD Red needle #5

50 Leak

1 3/4 turns on fuel screw

Try Dvns start point then read the kx250f jetting 201: sticky

It'll explain how to get it right..


What kind of fuel do you use?


What kind of fuel do you use?

93 pump

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