2000 WR 400 F Carb Questions
Posted February 17, 2002 - 12:20 PM
Posted February 17, 2002 - 12:51 PM
Posted February 17, 2002 - 02:37 PM
If your bike runs better at idle with choke on then it sounds like it is running too lean (choke richens the air/fuel mixture). Do you have "popping" on deceleration or an idle that "hangs" too high?
If so, all you MAY need to do is adjust OUT your fuel screw to richen the idle mixture.
The fuel screw is at the bottom of the carb on the cylinder head side. It requires a very short flat head screwdriver to adjust. Turn it in all the way to check the current position (# of turns). Then back it out maybe 1/2 turn more than it was (based on your description). Don't go more than 2.75 turns out. If you need that much, put in the next size higher pilot jet. You can easily change the jet by draining the float bowl, loosen and rotate the carb, then removing the nut at the bottom of the float. Access the pilot jet with a thin flat blade scredriver. If you take your old one with you to your local shop, they might be able to just match up with their batch of Keihin jets so you don't have to order one ...
If that doesn't help out then take the carb off and try Dan's suggestion.
[ February 17, 2002: Message edited by: skthom2320 ]