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Idle problems after throttle is closed fast.

Need some technical help with my 2002 Yamaha SXViper 700. I took of the carbs and cleaned them out the other day and now im having some problems that I cant seem to track down. The sled starts and runs great the only problem is when I rev it up high and let go of the throttle it will cough and sputter when it get to about 3000rpm. If I hit the throttle again it just boggs down and will not rev up. After it has down this I have to let it sit for about 5sec until it stabilise at idle than it run great again. It will only do it if I drop the throttle, if I let it out slowly it runs fine. Any idea on what wrong, thanks for any help you can give.

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  • Mel Jacobson
    Mel Jacobson May 11, 2010

    You have a shop manual for your bike ?

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Sounds like an overly rich condition when you let throttle snap shut no air enters or at least minamal air enters the engine and with to much gas the engine will bog down until the extra gas burns off(5 seconds) check floats height and make sure jets are secure and make sure the choke is all the way off

Posted on Jan 03, 2009

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