2003 Yamaha XJR 400 R Logo
Posted on Nov 08, 2009
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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.

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  • Posted on Dec 02, 2009
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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.

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