Question about 2005 Yamaha Xv 250 Virago S

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Yamaha dt 200 won't rev off idle

I can start the bike fine, although it smokes more than normal. When I twist the throttle the engine dies. If I do get it up to 3000rpm the engine runs quite well and revs up from there with no hesitation, but if I let the revs drop below 3000rpm its back to ide and won't rev up. Carb has been cleaned in a sonic cleaner and set at the dealer. Any ideas? Anybody?

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  • tombones May 11, 2010

    If the carb is not a CV carb it will have a slide actuated directly by the throttle cable. Pull the slide out of the throat of the carb then move the clip on the jet needle one notch lower. This will richen the low end fuel mix. Two notches my be needed.

  • tombones May 11, 2010

    If the carb is not a CV carb it will have a slide actuated directly by the throttle cable. Pull the slide out of the throat of the carb then move the clip on the jet needle on notch lower. This will richen the low end fuel mix.

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You should measure the combustion ratio.Maybe piston rings failed.

Posted on Jun 03, 2009

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