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Thread: SHO Compression

  1. #11
    RUSH.'s Avatar
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    Quote Originally Posted by smbstyle View Post
    so hold the throttle open when cranking with all plugs out is the proper way?

    yes!


  2. #12
    smbstyle's Avatar
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    I was just told that the SHO's are throttle-by-wire, so holding the throttle open won't do anything since the ski is not running?

  3. #13
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    Quote Originally Posted by smbstyle View Post
    I was just told that the SHO's are throttle-by-wire, so holding the throttle open won't do anything since the ski is not running?

    It will still open the throttle as it is cranking. Notice if you do this when starting the ski it doesnt want to start.

  4. #14
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by RUSH. View Post
    It will still open the throttle as it is cranking. Notice if you do this when starting the ski it doesnt want to start.
    Doesn't start because holding throttle wide open tps sends signal to ecu and kills spark, Throttle operates only when engine is running. Doesn't hurt holding it wide open when doing a compression test but you will not get higher compression readings.

  5. #15
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    Quote Originally Posted by JIM'S PERFORMANCE View Post
    Doesn't start because holding throttle wide open tps sends signal to ecu and kills spark, Throttle operates only when engine is running. Doesn't hurt holding it wide open when doing a compression test but you will not get higher compression readings.

    ah ha. Makes sense.

  6. #16
    Boilerman Bill BPnta's Avatar
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    Quote Originally Posted by smbstyle View Post
    I used a crappy pressure tester from autozone, and didn't get it tight enough in there probably, but I was seeing about 110-115 after a few cranks...
    Tested compression today, that's what I saw.

  7. #17
    Professional Alike Racer Clazz. Teerayoot's Avatar
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    Where to get a tool ?
    compression test
    Can Vi-PEC,MoTec can log that each cylinders compression ?,
    but i have see no one mention about it yet.

  8. #18
    Boilerman Bill BPnta's Avatar
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    Quote Originally Posted by Teerayoot View Post
    Where to get a tool ?


    Can Vi-PEC,MoTec can log that each cylinders compression ?,
    but i have see no one mention about it yet.
    Here's where I got mine:
    http://www.harborfreight.com/quick-c...ter-95187.html

    There's no means for those ECUs to measure compression directly.

  9. #19
    Professional Alike Racer Clazz. Teerayoot's Avatar
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    Quote Originally Posted by BPnta View Post
    Here's where I got mine:
    http://www.harborfreight.com/quick-c...ter-95187.html

    There's no means for those ECUs to measure compression directly.

    So cheap but unlucky seller not ship outside US

  10. #20
    Antiguan FZR's Avatar
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    Mine was 117 - 120psi cold.

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