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  1. #1
    Top Dog billman100's Avatar
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    what causes loss of compression

    so the dealer called back and said i only have 70 lbs of compression so i need a new top end. could this have happend when my pisser stoped pissing the hose came off the exhaust mani

    Custom750sx

    95 FX1
    -FOR SALE
    Gen2 BOB JW850BB- In Progress

  2. #2
    Top Dog
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    Re: what causes loss of compression

    yep.
    You're better off searching than listening to me.

  3. #3
    JS550
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    Re: what causes loss of compression

    overheat and melllltttddoowwwnnn

  4. #4
    Top Dog billman100's Avatar
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    Re: what causes loss of compression

    its not siezed and still cranks over so im thinking its not totally bad. do i need to do a whole top end rebuild or can i just put new rings in?

    Custom750sx

    95 FX1
    -FOR SALE
    Gen2 BOB JW850BB- In Progress

  5. #5
    JS550
    Guest

    Re: what causes loss of compression

    I had the same thing happen when my crank bushing came apart on a fresh top overhaul. I just had the cylinders done so i just inspected the pistons for major defects and re ringed it but like i said it was on a 3hr engine if its an older engine might as well have it topped.

  6. #6
    Top Dog billman100's Avatar
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    Re: what causes loss of compression

    what is an aproximate cost of a new top end

    Custom750sx

    95 FX1
    -FOR SALE
    Gen2 BOB JW850BB- In Progress

  7. #7
    PWCToday.com Is My Home Away From Home
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    Re: what causes loss of compression

    300 ish, from my local shop.+labor

  8. #8
    Top Dog billman100's Avatar
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    Re: what causes loss of compression

    what if i do it my self

    Custom750sx

    95 FX1
    -FOR SALE
    Gen2 BOB JW850BB- In Progress

  9. #9
    PWCToday Regular blahtt101's Avatar
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    Re: what causes loss of compression

    I bought a set of cylinders w/ pistons on ebay that were in GREAT condition for $150 and 2 rings for like $36. Plus price of gaskets and sealant and such, I think it totaled to a little over $200.
    United States Coast Guard Academy class of 2014

    Silver 1985 Kawi JS550 with Kerker exhaust, K&N Filter, primer kit, Westcoast intake grate, Mariner ride plate, Factory waterbox, and custom turf!

  10. #10
    JS550
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    Re: what causes loss of compression

    Thats the way to do it just make sure they are good parts.

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