3 replies to this topic
  • GoVols

Posted July 03, 2016 - 03:31 PM


I have been working on my 2005 WR450 way longer into the riding season than I would like to.   I have a problem with the bike running without the choke on.   I have totally rebuilt the top end, to include valve adjustment and new rings.  The bike will just not run without the choke on.  I have fiddle-farted with the Air/Fuel and Idle adjustments so much I fear that I will wear out the threads!!   When I do ride the bike with the full choke on, it has extremely choppy throttle response.  I turn off the choke and it cuts out.  It appears the vacuum lines are correct.  It starts, so I know I have spark.  I have cleaned the carb so many times I feel like I am the Bo and Luke Duke of the 450 world.  There has go to be an answer, but I'm at a loss.  

  • Krannie McKranface

Posted July 04, 2016 - 07:21 AM


Ream the passage above the pilot jet with real carb cleaner and light wire or fishing line

There is a tight bend in there that gathers corrosion and debris


Also, service the hot start plunger and cavity for corrosion/leaks


When you say you 'cleaned' the carb, unless you also replace the worn out areas, cleanliness won't help much


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  • Slow and Jerky

Posted July 04, 2016 - 08:38 PM


Krannie is probably right, it's a carb issue, but also check the exhaust and make sure you don't have any sort of restrictions, take the tip out and see if you notice any difference. 

  • Krannie McKranface

Posted July 04, 2016 - 08:53 PM


If you have the stock WR exahust tip, it will never, ever run correctly.


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