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  1. #1

    Yamaha fzr 2012 60 psi cylinder psi

    hello, recently acquired a used engine for a 2012 fzr engine wont start it had 60psi on all cylinders, seller said it was in a shack over winter. could it be stuck piston rings?
    i added brake fluid to help maybe remove the stuck rings and cylinder psi spikes to 140psi when all oil is expelled it goes back down. any suggestions or any one with a similar issue.


  2. #2
    big john's Avatar
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    rings are shot or stuck, they also have a problem with the cylinder walls getting tapered and outta round, pull the head and check the bores to see if its able to be honed or needs a oversize piston. also don't use brake fluid, marvel mystery oil or Yamaha ring free would possibly work well to free stick rings if that's all that's wrong with it.

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  4. #3
    truth is i don't really wanna spend more time and any money since i paid for a working engine. but sh!t likes this just gets to me when people sell things, we talking 3200 no electronics.

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    Joker's Avatar
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    Quote Originally Posted by big john View Post
    rings are shot or stuck, they also have a problem with the cylinder walls getting tapered and outta round, pull the head and check the bores to see if its able to be honed or needs a oversize piston. also don't use brake fluid, marvel mystery oil or Yamaha ring free would possibly work well to free stick rings if that's all that's wrong with it.
    Marvel Mystery Oil is awesome!

  6. #5
    AWA MEMBER
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    I had a broke valve spring did that to me

  7. #6
    gonna pull the head tomorrow and see what gives.

  8. #7
    Quote Originally Posted by JoeyDFZS View Post
    I had a broke valve spring did that to me
    i got 60 psi on all 4 cylinders, i keep u posted at what i find.

  9. #8
    LugNutLS1's Avatar
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    I would say something to do with the rings if the dose of oil spikes the gauge. Throw some oil in the cylinder LS and let sit overnight. Retest then pull head off if still low readings. Sitting only causes a few things. Possibly the valve seats from sitting with a full waterbox but in all 4? Somewhat odd. Give that a whirl and report back. Is it bone stock motor as far as you know? And was running fine before the storage?

  10. #9
    leejax01's Avatar
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    Your battery is fully charged? Tried another compression gauge?

  11. #10
    LugNutLS1's Avatar
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    I was going to suggest another gauge to confirm the readings

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