Re: 1995 Bayliner sportjet
fire tech,<br />I have a Sugar Sand Mirage with a sport jet 120. The 120 jet pump (and subsequent jet pump drives from Mercury) are geared differently than your 90 jet pump. Also, you have a crankshaft end with 13 splines, and a specific bolt pattern, so if it isn't a sport jet, it isn't bolting in. The subsequent jet pumps are larger as well. In my opinion you are pretty much stuck with your engine, but that isn't all bad as the engines are very strong, the weak point being the electronics. So, I guess your best option is to assure that you are developing all the power you deserve, so check your compression, timing and carbs.<br /><br />Then take a look at your ride plate. Make sure it is straight with the boat, flush against the bottom, and no screws are missing. Look at the Gasket between the rideplate and the hull and make sure that looks good. Peak up underneath and see if the impeller is in good shape with smooth edges and assure that the wear ring (the circular fence the impeller spins in) doesn't have too much of a gap. A good gap is .010 inches, but I've heard of some that have worn to about .032.<br /><br />Finally make sure your reverse bucket completely clears the jet pump nozzle when you are in fwd 'gear'.<br /><br />The sport jet does suck gas, and since it isn't a propeller outboard the equivalent power is about 2/3 of what an outboard would do. That means basically it should act like a 60hp. The sport jets also are a bit slow to get out of the hole, but once on plane, are fun to drive, and since the impeller never reverses direction, you can go from forward to reverse without a pause for some spectacular water fun.<br /><br />good luck
