Jump to content
Sign in to follow this  

Idle 1998 yz250

Recommended Posts

I'm new to the forum,so hello everyone

I have a question about correct idle adjustment.

When I start the bike cold the idle appears to be normal after about a minute or two when the motor warms up the idle appears to pulse up and down, goes into some kind of cycling with pinging. When I adjust the air/mixture(richer) screw the idle returns to normal no cycling/pinging, but the pilot air screw is now turned in, all the way. The bike will continue to run for about 2 and half minutes the carb will load up and finally turn off. Do I need to change my Pilot jet or Jet needle postion. Jet needle postion is second from top.

thanks, for all help that is given

Edited by Brandon100XR

Share this post


Link to post
Share on other sites

you need a larger pilot jet, so raise it to the one above the one you have now.

Share this post


Link to post
Share on other sites

Thank you FoxySox, I changed the pilot jet. The previous owner had a #42 and I changed it back to stock. #48. I will try the changes later tonight.

Edited by Brandon100XR

Share this post


Link to post
Share on other sites

48 will most defently be to rich ( like everything from the factory) it should run its best between 1 to 2 2/4 of a turn out, hope it helps

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×