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>I have a Jazz from 1996 with 120 HP. I have the same >problem that it takes a lot of time to plane. >Sometimes when I give full gass to the engine it goes >in plane with 2 persons. Normally I have to but the >second person in front for a while. Have you other >guys solved the problem? Please reply.. I am living in >Norway and I think there might be 8.or 10 boats like >this all over Norway so it would be very find to have >som international help. > >Thank you ! > > > >>>>I have a 1996 Bayliner Jazz with a 120 mercury sport >>>>jet. The motor runs smooth but the boat won't plane >>>>with two people in it unless you put one in the very >>>>front. I had Bayliner put a new impeller and sleeve >>in >>>>it but it still won't plane any better. Any ideas? >>> >>>Exhaust gas leaking from the bottom of the boat can >>>get sucked into the jet pump and cause it to >cavitate. >>>Check the screws holding the ride plate on and the >>>gasket around the edge of this plate. The ride plate >>>is the big black aluminim plate on the bottom of the >>>boat. Exhaust gas can leak from the gasket around the >>>outer edge of the plate or from the edge of the >>>"window" in the middle of the plate where your intake >>>grate is mounted. You can try some silicone sealer on >>>these areas if you suspect leakage. It won't last for >>>long, but will tell you if this is your problem. >> >>I have no answers for your problem, but rather I have >>the same problem with my 1993 bayliner jazz (90HP). I >>think it just isn't pumping enough water to develop >>the thrust needed to perform like it is supposed to. >>It will get on plane with just one person on board, >>but the second person has to sit up front to get on >>plane. She'll only run about 31 mph with just one >>person. >> >>I just had the engine checked out - good compression, >>good spark, and they cleaned the carbs. There is no >>tach so I'm not sure how fast the engine is turning. >>Anyway, I performed a visual inspection on the jet >>pump impeller and wear ring and they have a very close >>tolerance (less than 1/16 inch - I recently replaced a >>wear ring on one of my jetskis, and there was about a >>1/4 inch gap between the impeller and wear ring and it >>made a huge difference in performance). So now I'm at >>the end of my rope. >> >>Any ideas would be appreciated.
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