Question about 2004 Yamaha YZ 250 F

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My yamaha 2008 big bear 400 will not stay running in idle jumps alot when trying to ride

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Time for a carb cleaning. Take off the carb, take it to someone with a sonic cleaner. Change your spark plug, clean out your tank (Take out the fuel shut off valve before you do this as there is a very delicate filter on the shut off valve that could be damaged otherwise), and replace your air filter. How long you want this repair to work is directly dependent on how well you clean everything. Even if you do a perfect job on the carb, a dirty tank will take it back out in a matter of minutes. a dirty, fouled or weak spark plug will hinder your efforts, and the carb cannot mix air it is not getting.

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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02 Big Bear 400- Hi-idle & backfires while running. Tried cleaning carb & air filter, drained bowl & cleaned with carb cleaner. Could there be aproblem with the choke.


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Yamaha 2008 ATV Big Bear 250 won't idle


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1 Answer

Have a 04 yamaha big bear 400. hard to start wont stay running unless chock is on spits and sputters and ocacionaly back fires. when try to throttle it it boggs through intake.


I have an 01, and it started doing this. I don't remember the circumstances. It's just dirty in the carb I think.

1) Check for water in the gas.
2) Turn off the petcock and drain the carb. turn it back on.
3) Try it.
4) Start it with the choke on and put your hand over the air filter hole. Will cause some back flow.
5) Try again.

Worked for me. Might be dirtier on yours, or have mud in it or something.

Nov 08, 2009 | 2003 Yamaha XJR 400 R

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