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  1. #1

    Join Date
    Dec 2010
    Location
    miami
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    46

    650 stand up; coil check? OR PSI TOO LOW?

    hey everyone!
    My buddy has an old stand up with a trasplanted 650 motor in it. I t starts and idles great. Revs up ok out of the water but not enough power in the water to even get on plane. Ive checked the reed valves, cleaned the carbs, and replaced all the fuel. I have a book but it doesnt seem to match with the wires on the coil. ....ANY SUGGESTIONS?..........ps...the compression is 90 on both cylinders.....TOO LOW???


  2. #2

    Join Date
    Dec 2010
    Location
    miami
    Posts
    46
    anybody out there??????????????????

  3. #3
    john zigler's Avatar
    Join Date
    Aug 2006
    Location
    WI
    Posts
    2,545
    +1
    33
    if you really only have 90 psi, the motor is VERY tired. ( running out of the water, there is no load). a stock kawi 650 should be at 150 psi, at sea level, with a good guage. maybe try another guage, but i think you found your issue.

  4. #4
    Yes, 90 psi is too low. Is your compression gauge accurate?

  5. #5

    Join Date
    Dec 2010
    Location
    miami
    Posts
    46
    thanks for the replies!!

    top end was bored and given wiseco pistons

    i'll post back with results SOON

  6. #6

    Join Date
    Mar 2011
    Location
    College Station TX
    Posts
    68
    90 psi is too low, thats probaably part of the problem

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