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Joe
Joe, Marine Mechanic
Category: Boat
Satisfied Customers: 7136
Experience:  ASE, electronics, Marine mechanical and electronics, pwc, wiring, all around repair tech,
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1998 seadoo gtx rotax 787 keeps fouling out number 2 plug comp at 120 both cyl once u put

Customer Question

1998 seadoo gtx rotax 787 keeps fouling out number 2 plug comp at 120 both cyl once u put new plugs in only revs to 4k and bogs under wide open throtle new coil and harness fuel pressure 60 psi new injectors no low battery warning has new magneto and retifier and battery and stays charged Sometimes rpms kick in and out like its misfiring and it takes off there is extra smoke also
Submitted: 1 year ago.
Category: Boat
Expert:  Joe replied 1 year ago.
Hello,

Thank you for your question, my name is ***** ***** I will be glad to assist you with your concern today.

First things to start with are a leak down test on the engine, next rave valves, next using a timing light check for misfires on that cylinder vs the other pto/mag. Next would be carbs or if single carb checking the intakes and reeds. You'd also want to check your rotary valve while in there to confirm timing. Check your oil lines and make sure that side is not dumping extra oil.

Thank you!

- Joe

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