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  1. #1

    xp seadoo 787 oil on exhaust manifold causing smoke, bogs @ WOT

    compression is 150 psi for both cyl. premix amsoil and 93. i can start it and rev and it sounds fine. but the oil leak causes it to smoke and the smoke causes the engine to bog because its sucking that in instead of air. where is my leak at? and what do i need to replace THANKS


  2. #2
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    that leak is coming from your counterbalance cavity. I believe your crank seals are shot.
    Its sucking the oil thats inside the counterbalance shaft and worm gear.

  3. #3
    flyin' the friendly skies airbornexp's Avatar
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    it almost looks like its coming from the exhaust port or the rave valve. have you check the bellow on the rave? if its the exhaust port you just need an exhaust gasket.

    Is that a FPP spec II?

  4. #4
    this ski belong to girl name skinny she raced. i dunno anything about the ski i just kno it was race modified. the ski cranks up and runs fine. just the oil causing smoke to enter the intake is no good. so just the exhaust gasket?

  5. #5
    Quote Originally Posted by ultramaxracing05 View Post
    that leak is coming from your counterbalance cavity. I believe your crank seals are shot.
    Its sucking the oil thats inside the counterbalance shaft and worm gear.
    Your picture posted has nothing to do with the counterbalance shaft or crank seals---Your RAVE Valves are leaking badly--clean and rebuild them with new O-rings. If they still leak then you will need to replace the RAVE Valve Slides and Bodys as a set. Older units are starting to show excess wear in the RAVE Valve slides/inner body causing blow-by. If the engine has ever been bored, be sure to cut back new RAVE Valve slides appropriately or they will kiss the Pistons.
    Only other possibility up that high on the engine is the Exhaust Manifold Gasket but you would probably be seeing a lot of smoke and water spewing from that if you run it on the lake w/o the seat on.

  6. #6
    here is a better picture. the front bellow gasket is dark the rear bellow is white, and the exhaust gasket looks good. double click to enlarge

  7. #7
    ok i took the rave out and the oring was all shot. do i ahve to take the exhaust off for it to come up or is there a easier way out? thanks

  8. #8
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    I have some spare rave valves, and parts let me know if you need some.

  9. #9
    around dallas?

  10. #10
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    I'm in houston but I can ship them tomorrow, I got some spare 787 parts.

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