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Bike only runs with hot start pulled in

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I have a 05 YZ450F that will only start and run for a few seconds with the hot start pulled in. How do I go about fixing this?

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What is causing that condition is hard to say, but most likely it is a leaking choke plunger, or a  clogged pilot jet and passage, which is extremely common.

The fact that it only runs 'for a few seconds' is another issue.

Service the entire carb  http://www.dirtrider.com/features/protips/141_0707_keihin_fcr_carb_rebuild/

 

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