Eating spark plugs...
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  1. #1
    PWCToday Guru johnny340's Avatar
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    Eating spark plugs...

    My VHP runs fantastic for up to up to 15 minutes then doesn't rev up all the way like it should. I come back, change the plugs, and it works perfect again but for only the first 10-15 minutes. I originally thought it was stator related but all coils check out with proper resistance. (Although, I haven't tested the stator in boiling water yet.) Could a bad stator or anything else 'wreck' plugs? Can they get too hot? They look fine. I'm using BR8ES. I think the recommended one for the 550 is the B7ES which is hotter (dissapates less heat) and is probably a step in the wrong direction.
    Has anyone dealt with anything like this before?

  2. #2
    PWCToday Newbie
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    Re: Eating spark plugs...

    I know this is an old post but did did you every figure out what was causing the spark plugs to fail?

    I have a 2005 Seadoo GTI RFI that seems to have the exact same issue. It run great for about 30 minutes then one of the cylinders dies (not spark). I replace the spark plug in that cylinder and it run fine again for another 30 minutes. I initially thought it was a fuel issue and replaced the fuel pump, verified the fuel pressure and checked and cleaned the injectors. I replaced the ignition coil and still have same problem. I can not figure out what would be causing the spark plug to fail.

  3. #3
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Eating spark plugs...

    ChrisA, switch that RFi over to Iridium plugs and I bet the problem goes away.......that is, unless it's oil fouling from leaking center crank seals. Then it's time to loop the RV lines and fill with 95/140 gear lube.

    BR8Eix
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  4. #4
    PWCToday Newbie
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    Re: Eating spark plugs...

    Thanks for the response!!! - I will try the Iridium plugs.
    I don't believe the plugs are fouled, they just look wet from not firings. What do you mean "loop the RV lines and fill with 95/140 gear lube."?

  5. #5
    PWCToday Regular CALJET's Avatar
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    Re: Eating spark plugs...

    Q; what is the advantage to 95/140 gear oil instead of inj oil for the rotary shaft? I also gotta 800RFi which is almost hydro-locked from oil in the crankcase after sitting for the 6 months during the winter.
    1998 Yamaha GP1200 - stock
    1987 Kawasaki X2 - few bolt ons
    2004 Seadoo 3D - stock

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