01 wr 426 won't idle

3 replies to this topic
  • ndc1987

Posted July 20, 2013 - 10:20 AM


Bought a 426 that has been sitting up for a few years. Changed the plug cleaned the tank and it fired right up. It wouldn't run without the choke on. So I replaced the pilot jet and rebuilt the carb. I also moved the jet needle clip down two places to the#2 position. Put it back together and now it will only start with the hot start out. If you push it back in the bike dies. If you hit the throttle it dies. If you pull the choke out it won't start. Took the carb back apart and put it all back to the settings when I first took it apart. This is my setup now. 170 main 42 pj pjs turned all the way in. Has a pro circuit exhaust . I adjusted the flot to 8mm. It still won't idle and only starts with the hot start out. Any ideas? The guy I bought it from said it ran rough when he owned it

  • Thommo_400f

Posted July 23, 2013 - 02:45 AM


Could be a few probs:
Choke plunger stuck out.
Fuel screw tip broken off or not seating.
Throttle slide plate upside down.
Idle screw set too high.

My guess is choke plunger or fuel screw stuffed.

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  • Krannie McKranface

Posted July 23, 2013 - 09:07 PM


You are rich.
See if the main air jet in the intake bell is clogged, or if the choke plunger is leaky

  • chrisparker

Posted July 28, 2013 - 08:04 AM


If the bike will idle, albeit fast, with the choke on, then the pilot jet is plugged. In my experience this is usually the case. I've had good luck dumping the old gas, putting in fresh heavily dosed with sea foam fuel treatment. make sure the float bowl is full of the mixture and let it sit overnight. Next day ride the piss out of it with lots of throttle chopping to force fuel up through pilot jet. Good luck.


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