YZ 400 high idle

I know this is an old topic but my search has not quite come up with what I want. I have a 98YZ 400 when you crank the throttle open after its warm sometimes the throttle shuts and then I get a high idle for 10 seconds or so and then it drops to normal. cleaned carb, adjusted cables, checked for leaks blah blah blah. What in the H am I missing!!! Please help tters!!!

Hanging idle means lean jetting. Go up a size in pilot jet and main jet and adjust your fuel screw. Probably cooler weather there now, right?

Yep that was it. Ya its only 40's here. needs a fatter pilot but I cranked open the screw and that got it. Thanx though.

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