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  1. #21
    PWCToday.com Is My Home Away From Home SxiPro's Avatar
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    Re: Proper Compression Check

    Quote Originally Posted by wisjetskier View Post
    So the Yamaha service manual writers are full of bullsh!t then (check out step 4 in second column).....

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  2. #22
    PWCToday.com Is My Home Away From Home PrickofMisery's Avatar
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    Re: Proper Compression Check

    Yes, yes the are.

    The only thing more laughable than a Yamaha “service manual” is Ricky G

  3. #23
    PWCToday.com Is My Home Away From Home Chester's Avatar
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    Re: Proper Compression Check

    One plug at a time. If there is any fuel in the crankcase, it will spray out the plug hole and could get ignited. How do you think I know this. The slight, if any, difference in cranking speed is negligible. Safety is number one priority.

    Chester
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  4. #24
    I dream skis GabeH's Avatar
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    Re: Proper Compression Check

    Hey Chester, no smoking while doing the compression test!!!! Lol

  5. #25
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    Re: Proper Compression Check

    I check compression on everything from a 80's Kawls to 2019 whatevers.

    Opening the throttle very rarely gets any better or worse #'s 4 or 2 stroke. Should pull full throttle on fuel injected skis cus most brands cut the spark & fuel during cranking.

  6. #26
    I dream skis
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    Re: Proper Compression Check

    Quote Originally Posted by Chester View Post
    One plug at a time. If there is any fuel in the crankcase, it will spray out the plug hole and could get ignited. How do you think I know this. The slight, if any, difference in cranking speed is negligible. Safety is number one priority.

    Chester
    This response makes sense. This is the only reason given, so far, for taking out only one plug at a time.

    If this is the only reason for one plug at a time, then if you are building a new engine, or have no fuel around, there is no problem testing compression with all plugs out.
    2, 1998 TS 770 L, restored and running great as of July 2019 (NO THANKS to the person at SBT, who put the WRONG crankshaft bearing into the rebuilt engine I got from them)

  7. #27
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Proper Compression Check

    So I take it holding my thumb over the spark plug hole does not give an accurate reading, sorry I just had to this thread is starting to read like a what two stroke oil should I use thread
    Last edited by WFO Speedracer; 10-09-2019 at 09:12 AM.
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  8. #28
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: Proper Compression Check

    Walmart all the way. FTW

  9. #29
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    Re: Proper Compression Check

    If you really want to know the shape of your engine use this type gauge. I've personally seen scored Pistons with stuck rings give good compression numbers. Cranking type gauge is just a good guess.

    "OTC's 5609 Cylinder Leakage Tester Kit quickly diagnoses internal engine problems like bad rings, valves, and leaking head gaskets"

    IMG_6776.PNG

  10. #30
    PWCToday.com Is My Home Away From Home SxiPro's Avatar
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    Re: Proper Compression Check

    Quote Originally Posted by driftmaster View Post
    If you really want to know the shape of your engine use this type gauge. I've personally seen scored Pistons with stuck rings give good compression numbers. Cranking type gauge is just a good guess.

    "OTC's 5609 Cylinder Leakage Tester Kit quickly diagnoses internal engine problems like bad rings, valves, and leaking head gaskets"

    IMG_6776.PNG
    Do I pull all plugs, or one at a time when using this????
    Changes aren't permanent, but change is.

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