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  1. #1
    tvtyme2000's Avatar
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    compression test?

    My 2007 gp1300r has 150 hours now.It still runs like a champ.Today I did a compression test.The first two cylinders from the front were about 140 psi.The back was 135.What should the normal stock reading be?The manual says 91 is minamum.I tested with throttle wide open and full battery charge.Is 5 psi on 1 cylinder bad?I would like to run another year before top end rebuild.I have yet not had anyone pass me.


  2. #2

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    You're fine.
    Within 10% is acceptable.
    I understand that 5 less on back cylinder is how they come from factory.

  3. #3
    wotxxxsd's Avatar
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    Your good to go...
    Keep Rippin...

  4. #4
    Gus13letter's Avatar
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    Quote Originally Posted by toyterrific View Post
    You're fine.
    Within 10% is acceptable.
    I understand that 5 less on back cylinder is how they come from factory.
    Yeah, rear is typically about 5 less. Good to go!

  5. #5
    tvtyme2000's Avatar
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    Quote Originally Posted by Gus13letter View Post
    Yeah, rear is typically about 5 less. Good to go!
    Thanks I thought I read somewhere that the rear cylinder was a little less.I love this forum many friendly knowledgeable people.With a manual and this forum who needs a high priced yamaha dealer.knock on wood

  6. #6

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    your engine is just breaking in keep doing what your doing thats excellent compression for the age and hours on the ski

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