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  1. #1
    05RXT82Mi/hr's Avatar
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    2016 Seadoo 300 burn piston. -detonation??

    Hi I finish rebuild my motor with new Riva pistons . Ski have everything what can be instilled from Riva , Stage 3 , 4 . Even more. I purchase brand new ECU so I can brake in engine for 10 hr nicely . In 3 hr I check the oil and was getting gray , replaced for new one with new filter. I was thinking it was normal in brake in . Checked at 7 hr same thing. After 11hr I tune my ECU up to 8500 RPM with race map. Was working fine , no noise, 85 mi / hr easy.
    After 17 hr engine gets lot of oil coming out of catch can. I check compression and 2 cylinder have only 90 psi . All others 145 PSI.
    Opened engine and find piston 2 is burn . Now doyknow why this happens. What is the issue??
    It can be because I have bigger injectors and Stock ECU??
    some one told me this is detonation ? Please help me how I can protect my engine in future or what was the issue. Thank you
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  2. #2
    Detonation....

  3. #3

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    Poor fuel quality or too much advanced ignition timing from the riva tune...

  4. #4
    Bob 1tommygunner1927's Avatar
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    Which tune specially did you flash to the ECU?
    Is A/F ratio monitored?
    What fuel was used?

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  6. #5
    05RXT82Mi/hr's Avatar
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    I run 93 shell gas .

  7. #6
    05RXT82Mi/hr's Avatar
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    1. Quote Originally Posted by 1tommygunner1927 View Post
      Which tune specially did you flash to the ECU?
    Quote Originally Posted by 1tommygunner1927 View Post
    Is A/F ratio monitored?
    What fuel was used?
    I send ECU to Race Lab dyno tune up
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  8. #7
    Mod less, ride more! troyheb's Avatar
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    How do the other pistons look?
    You say that the other cylinders the compression is ok. If it just that one cylinder then it might be an issue with that injector.


  9. #8
    05RXT82Mi/hr's Avatar
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    Quote Originally Posted by troyheb View Post
    How do the other pistons look?
    You say that the other cylinders the compression is ok. If it just that one cylinder then it might be an issue with that injector.
    What oil should I use 10W40 ? Im getting 9000 RPM at low speed . At maximum speed is limited to 8500RPM.
    I was reading some guys using 15W50 oil .
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  10. #9
    how much was the coating for the cylinder ?

  11. #10
    It looks like you leaned out on that piston it's got a chunk missing from it


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