Question about kawasaki KX 250 Motorcycles

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Vn800 running fast on tickover

Apart from running fast, when turned off there is a small backfire

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  • Anonymous Apr 16, 2009

    Cheers buddy that has been very helpful, but dont know where the idle screw is, the only  screw I can see is right at the bottom of the carb I wonder if this is the idle screw? by the way thanks

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  • 3,567 Answers

I am not sure what you mean on the "running fast" statement. If idle speed then turn the idle screw outward to slow down the idle.

The backfire is caused by turning off the ignition key when the bike is at high revs. let it idle down THEN turn it off. The backfire is there because the carb idle circuit is active anytime the piston is in motion. Gas goes into the cylinder as the bike revs down then a hot spot in the exhaust pipe finally ignites the built up gas. There is your backfire.

Is the running fast question answered? Give me more information on the problem if it isn't.

Please rate this answer. Thanks njv6!

Posted on Apr 15, 2009

  • tombones Apr 16, 2009

    I don't know what year and exact model your bike is. Can't say where the idle screw is.

  • nagantmoisin
    nagantmoisin Oct 06, 2012

    I am so thankful for ALL the comments and advice on how to stop the fuel issues on a Kaw 800. After studying them all I found my solution. TANK and PETCOCK. I was erronouesly convinced the carb was the culprit. This bike had fuel since 2005 with 3199 miles on it. I did rince the tank and added Seafoam and it ran good for 1000 mile. Then it happened. Fuel dumped out enmass. After 20 futile times into the carb, I read about the petcock. I took the tank down again and took out the screen. It was nasty and rust just poured out with another rince. So the solution was clean the nasty tank and petcock. Thank you for all the tips.

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