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Thread: compression

  1. #1

    compression

    I just did a compression test last night on my 2001 GP1200 and it read 110, 110, 105. Are those numbers in the acceptable range or do I have a problem?? Are there any fuel additives that will bring up compression slightly. Ive read some of the discussions on here that say 120 is the ideal range.


  2. #2
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by bsmith45 View Post
    I just did a compression test last night on my 2001 GP1200 and it read 110, 110, 105. Are those numbers in the acceptable range or do I have a problem?? Are there any fuel additives that will bring up compression slightly. Ive read some of the discussions on here that say 120 is the ideal range.
    When doing a compression test make sure you only have the one spark plug out your testing not all 3, remove spark plug wires and hold throttle wide open.

  3. #3
    I'm not doubting any advice given by jims p...but i've heard that turning over without wires attached(grounded) can cause problems with coil or icu or icm or something like that due to not being able to find ground??....just tryin' to learn....

  4. #4

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    110 is starting to show signs of engine wear. 1 st check your checker lol. The most import thing about compression gauges is that you buy a damm good one cause you have to trust it . To check your gauge if you have an air compressor is to inject air from your air tank into end of gauge and compare results on tank gauge it should be within 10% of each other. If it is your reading would be very close. If you want to try an additive I would say Yamahas Ring Free additive works best , but mind you there is no such thing as compression in a bottle.. and it is best to ground the plug wires due more to exploesion than hurt the box.

  5. #5
    So if these are signs of engine wear, what would be my next step? an engine rebuild? and what would that consist of?

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    Are you sure that your doing it the correct way as jim mentioned ? Also with a full charge on the battery... otherwise as long as its running good dont worry too much! Have you done the supporting mods yet ? those would be my first moves and switching to premix to keep her alive!

  7. #7
    I havent had a chance to check it the correct way cause I borrowed my friends gauge and hes out of town right now.
    What supporting mods are you referring to?? Is it recommended that I switch to premix? and whats the mix 40-1 ?
    Thanks

  8. #8

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    Well, you dont have any info if you have not checked the compression the correct way, just random inaccurate numbers For now dont worry too much, go get yourself a compression tester they are inexpensive and you need one if you own a ski... As far as pre mix its recomended that you bypass the oil pump and pre mix to avoid a line falling off or at the least go zip tie the lines on so they don't come off... look and read the stickies and you iwll find lots of info on the stuff you should do when you get one of these skis. At the least i would do the wave eater clips, d-plate, fill the shoe and an intake grate. Its cheap easy insurance for safety, performance and reliability of the motor and yourself!

  9. #9
    Superman! fivespeedsteed's Avatar
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    What he said plus yes 40 to 1 is right

    Sent from my Incredible using tapatalk

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    Like the photo, I've been stuck there too!

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