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  1. #1

    Join Date
    Aug 2009

    Runaway engine rpm

    Ok I've got a '04 xl700 with a 701 62t engine. I bought it not running. Actualy it wouldn't rev up. I started with replacing the coil since it seemed like one side wasn't firing. After that the engine started to run away. compression went dead on one cyl due to burnt piston. from then I tore the engine down new pistons rings crank seals resealed the case all new gaskets reeds are new crankcase holds 10Psi. 160 pis compression.Rebuilt both carbs pop off is about 30psi.
    could it be timing?
    throttle cable is loose
    butterflys are closed.
    What am I missing
    I'm pulling at straws now

  2. #2
    Mpeavler's Avatar
    Join Date
    Dec 2005
    Anderson, Indiana
    142 runs now but revs high upon start up? Any all done to the ski....? Is the fuel line/filter full of fuel? It held 10psi for at least 10 mins?


  3. #3
    rob2337's Avatar
    Join Date
    Jun 2007
    Montréal, Québec Canada
    What about retarding the timing as I mentioned before. It worked for me

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