Question about Yamaha 2004 Bruin 350 Auto 4x4

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Wont idle without choke being used

Starts fine, runs fine, just wont idle when choke is fully off,must keep choke on slightly for it to idle on its own.

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  • Richard Collier Jun 21, 2014

    I have the same problem, also when I try to rev the engine it just sputters out and dies... is it probably the Jet thats dirty as well?

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  • 33 Answers

Main jet dirty. Likely Ethanol fuel fouling. Remove and clean jet. Check all rubber tubing to/from carb for cracks/deterioration and replace.

Posted on Nov 25, 2013

Testimonial: "Thanks, I had a feeling it was fuel related, this 4 wheeler is hardly used aside from plowing snow and is kept inside all year round, it only has like 12-15 hours on it and was purchased new."

  • myamiga Nov 26, 2013

    Yes. Fuel with Ethanol will break down after about 30 days absorbing water. Use a fuel additive to preserve the gas will prevent this problem.

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