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  1. #1

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    Cool [Waverunners] And why you shouldn't run cheap fuel!

    These are Riva Stage II Yamaha 1200's. Basically they were built to be as fast as possible without requiring race fuel. The carbs/tune/etc - everything is dialed in for 93 octane.

    So guess what.. The new owner (one friend sold his waverunners to another friend) decided to save $.20 a gallon by running 87 octane.

    Before he even ran the boat we said it was going to blow .. but oh nooo.. his girlfriend said it'd be fine. So he added some octane boost for good measure (totally useless).

    Sure enough it toasted a piston and cylinder.



    So that $3.00 he saved on fuel is going to be a grand or two to fix. Nice ey?


  2. #2
    BoostCrzy's Avatar
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    good job.....

  3. #3

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    i would say it had nothing to do with running cheap fuel but more to do with running the wrong octane. if your set up for 93 then run 93 if you set up for 87 then there is no point in running 93 really.

  4. #4
    Goliath's Avatar
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    Quote Originally Posted by stingray152003 View Post
    i would say it had nothing to do with running cheap fuel but more to do with running the wrong octane. if your set up for 93 then run 93 if you set up for 87 then there is no point in running 93 really.
    Exactly. I'm not really into modding my ski's, so I just run regular 87 octane. No need to run 93 when it is a stock ski...

  5. #5
    Moderator RX951's Avatar
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    Question

    • what compression did this ski normally have?
    • If this an engine that need the oil/ gas premixed or is the oil injection still hooked up?
    • were the carbs just freshly rebuilt? or do they have alot of hours on them?
    Last edited by RX951; 06-29-2008 at 09:16 AM.

  6. #6
    Quote Originally Posted by mdhmi View Post
    Before he even ran the boat we said it was going to blow .. but oh nooo.. his girlfriend said it'd be fine.
    more importantly! is she hot?

  7. #7

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    The point was kinda just to chuckle at what happens when you run 87 octane on a motor that was built and tuned for 93 (higher compression, etc).

  8. #8
    steach's Avatar
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    I'm with Billie, this doesn't look like an octane problem. Lean fuel or lean oil.

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