Don't hate me, 2000 yz 426 throttle issues

So I recently purchased a 2000 yz 426. The guy claimed it has abig bore kit on it, but that was all he said. Now when I went to moon rocks it was great! But every time I Crack open the throttle it dies. If I roll it on it reacts just fine though. So I did what any other self respecting guy would do and searched the internet for mods to cure this problem. I did the BK mod and it did absolutely nothing at first. I got the timing to just miss the slide and the duration to .5 seconds. So I assumed it might be my air/fuel screw. I took it two turns out and it messed everything up! It had no reaction to throttle till it was about a quarter open. It barely ran. So now the fuel screw is out about 3 1/2 turns. It's still doing the same thing, but only when I'm riding it. I can't even roll the throttle on anymore. I'm so confused!! Also I put my needle at three notches from the top, it was at 5. Elevation 5000ft. Temp 70°. Please excuse my stupidity. Help me....

It's all in the jetting...

Patience and methodical tests is the way to go.

Get a new pilot jet.

Check the o-ring on fuels screw as they perish or can be split or missing.

Set everything to stock and test from there. Set the fuel screw by the stickies from William.

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