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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
    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.


  7. #6
    It looks like you leaned out on that piston it's got a chunk missing from it


  8. #7
    05RXT82Mi/hr's Avatar
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    Quote Originally Posted by 01xp View Post
    It looks like you leaned out on that piston it's got a chunk missing from it
    Other 2 pistons looks fine, just very, very 1-2 light scratches on cylinder wall.

  9. #8
    05RXT82Mi/hr's Avatar
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    I run 93 shell gas .

  10. #9
    05RXT82Mi/hr's Avatar
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    Quote Originally Posted by 01xp View Post
    It looks like you leaned out on that piston it's got a chunk missing from it
    i thing the problem was old ECU what was on ski , I put this motor and start it with old ECU and injectors.
    engine was running ruff for sometime. 20 min.or so then I clean injectors and connection.
    But I don’t know that 20 min will can burn piston.

    Ski before I have it was under water , can’t remove pistons from cylinders, that how rusty was .
    I never check and clean injectors before start new motor.
    i will definitely check them now .

  11. #10
    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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