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  1. #1

    Internet Resources Vs Workshop Manual, Compression Test Big Difference

    Hey guys i just looked up in my workshop manual the Yamaha 2000 GP1200R Millennium silver edition, the workshop manual says stock compression to be 500Kpa which is 72psi, now looking online everyone is saying 110-125psi is stock

    Whats the go?


  2. #2
    Click avatar for tech links/info K447's Avatar
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    Which workshop manual are you looking at?

    Does your manual list both metric and US specs for compression?

  3. #3
    Quote Originally Posted by K447 View Post
    Which workshop manual are you looking at?

    Does your manual list both metric and US specs for compression?
    I'm using a free version found all over the internet, it has NM and FT/LB for torque settings but the compression only has 500Kpa it doesn't have psi ratings

  4. #4
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by gazza2011au View Post
    Quote Originally Posted by K447 View Post
    Which workshop manual are you looking at?

    Does your manual list both metric and US specs for compression?
    I'm using a free version found all over the internet, it has NM and FT/LB for torque settings but the compression only has 500Kpa it doesn't have psi ratings
    Is there a brand name on the manual front or back page? A publication number?

  5. #5
    Quote Originally Posted by K447 View Post
    Quote Originally Posted by gazza2011au View Post
    Quote Originally Posted by K447 View Post
    Which workshop manual are you looking at?

    Does your manual list both metric and US specs for compression?
    I'm using a free version found all over the internet, it has NM and FT/LB for torque settings but the compression only has 500Kpa it doesn't have psi ratings
    Is there a brand name on the manual front or back page? A publication number?
    Here's a screen shot of the front page plus the compression reading
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  6. #6
    powerstroke specialist mikegp's Avatar
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    good numbers are around 125 , not less than 115 to run good .

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    WFO

  8. #7
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by gazza2011au View Post
    ...
    Here's a screen shot of the front page plus the compression reading
    Looks like a PDF scan of the Yamaha fox-28197 service manual.

    That might be a non-USA version of the manual, perhaps the USA market service manual has the compression numbers in PSI?

  9. #8
    Happily Self-Employed WFO's Avatar
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    also to get correct compression the throttle should be open, valve servo motor unplugged so they dont open, battery fully charged, and remove one plug at a time

    plus gauges will vary on accuracy so look for consistency from front to back

  10. #9
    I just had the engine torn apart and i inspected each top end, all 3 were in good condition, i reassembled the engine and done the compression test on each cylinder i got 80psi

  11. #10
    dockwalker's Avatar
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    As WFO says,gauge accuracy matters.My El-cheapo set was 20psi less than the Snap-On.Borrow a set and recheck.

  12. +1 by:

    WFO

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