Posted June 20, 2000 - 06:31 PM
Posted June 21, 2000 - 05:44 AM
My '00 WR has a #45 pilot with pilot screw set at 2 1/2 turns (out is richer)with no ex. baffle. Try a new plug to be sure.
[This message has been edited by James Dean (edited 06-21-2000).]
Posted June 21, 2000 - 08:43 AM
Posted June 21, 2000 - 11:25 AM
Don't expect the main jet to make any difference with your problem. It only meters fuel at 3/4 to full throttle. I have run my bike without a main jet before to confirm this, rode 20 miles no problem! Most guys run 170-180.(#172 in mine now) You must try adjusting the pilot(fuel) screw on the bottom of the float bowl. About 2 1/2 turns from fully seated is my current setting with #45 pilot jet and at 60F and 500ft elev. Needle clip #3 is stock, but it is lean at low throttle settings and transitions from idle may hesitate.(#1 is top clip slot) Many on the Forum have switched the needle out. DVP or EKP are good choices and are options from the YZ400/426. Familiarize yourself with the jetting tips in the tech section on Thumpertalk and the manual.
Posted July 01, 2000 - 11:01 AM
James dean seems to know his stuff about jetting, search in the posts for the needle discussions. If you need help moving the clip, drop me a line
Anyway the moment I adjusted the needle (172/45) and adjusted the pilot screw properly the hiccup was 95% gone. I still foul plugs after long downhill decents or extended slow riding, so further adjustments (needle change?) are still needed, but it runs incredibly well. The next step is to experiment with needle. One note about the fuel screw on the '00-on my bike one tiny turn of the screw seems to do a lot-turn it and wait for 10 seconds between turns to listen for the engine to smooth out. Good luck.