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  1. #1
    Manila, Philippines joaqslam's Avatar
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    GP800R with SBT engine hard to start

    Happy New Year.
    I have a 1999 GP800R running on premix with an engine from SBT. Also use a primer most of the time to help start. Took the ski out during the new year weekend and I noticed that my ski is hard to start now. Also noticed that sometimes it just keeps cranking and does not follow through. Removed the spark plugs and noticed that they are wet/coated in gas/oil. What could be possibly causing this and what could be the fix?
    I used to start up easy using the choke/primer but now seems impossible.
    Any help would be greatly appreciated.


  2. #2
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by joaqslam View Post
    Happy New Year.
    I have a 1999 GP800R running on premix with an engine from SBT. Also use a primer most of the time to help start. Took the ski out during the new year weekend and I noticed that my ski is hard to start now. Also noticed that sometimes it just keeps cranking and does not follow through. Removed the spark plugs and noticed that they are wet/coated in gas/oil. What could be possibly causing this and what could be the fix?
    I used to start up easy using the choke/primer but now seems impossible.
    Any help would be greatly appreciated.
    you check compression?

  3. #3
    jetskitech's Avatar
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    may have a bad reed. did you inspect them when the engine was out?

  4. #4
    Manila, Philippines joaqslam's Avatar
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    Finally got to test compression today.
    One Cylinder reads 9 bar (130 psi) and the other 8 bar (115 psi)
    Anything to consider with these readings?

  5. #5
    I dont know what SBT compression runs with those sleeved engines, the OEM is120/cylinder. Also make sure you leave the other spark plug in and throttle wide open when cranking for the test, and good battery. If they are high or low as longs as they are close to the same PSI its usually gauge error. May want to call SBT and ask what the compression on the rebuilts should be.

    When were your carbs last built?

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