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Re: just bought boat & prop will not in gage all the...
Put your motor on the garden hose after you remove the propeller (you don't want to step into a spinning blade). remove the cover and start the motor.
Have some one shift the motor (without engaging the throttle).. This will show you which cable is the shift cable.Disconnect the shifter, and while it's running, shift it full forward and full reverse to fin the halfway point. Next return the control box to neutral and adjust the connector. Start it up and see if the control box will shift the gear box as far as you did by hand. If not you need to take the control box apart and move the cable anchor so you get more movement. Get a repair book and take pictures as the guts of a control box can be VERY confusing.
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run the engine and watch the drive shaft behind the engine , is it turning ? also as your mate selects forwad and reverse ! does it stop turning ? pos flywheel damper or output shaft damaged ! pos gearbox damaged !??
well first you dont want cavitation. But if you are referring to slippage of prop it is either the prop causing the problem as wrong prop or damage. without knowing more this question is hard to answer. Please explain more for more thorough answer
you could try a lower pitched prop.2" would up the revs by 400 revs.,which would up the revs ,but give you more low down thrust,and/or tucking the motor under more[if you have electric trim/tilt].thats a big boat and fair bit of weight for a 40hp..my 40hp merc is on a 13ft saracen,and with two of us it takes a while to get gooing.so i bought a ProPulse prop,with adjustable pitch.been god to try different pitches
Check the running height of the motor.The prop shaft should be about one inch below the straight line of the bottom of the running bottom of the boat.With a cleaver prop it may be lower.A chopper prop is the best and you can run every bit of that.2 inches if pitch is = to about 500 revs.Try a few props 1st before you pay the dollars for a new one.The bouncing is the wrong transom height and prop.You don,t need a cav plate if the boat is set up right.(a cav plate extension like a manta).Bad dealers may want to sell you these.A well set up boat doesn't.I've set up and run a lot of ski racing boats and all have never needed any "bolt on parts".Its mainly a motor height and prop selection thing.Hope this helps
It sounds like the prop bushing is bad. There are 2 systems for preventing gear damage,shear pins and rubber prop bushings.
The rubber bushing can be molded to the prop or there is a type that has a sleeve the prop fits over. If the prop has no sleeve you need to take the prop off and have it relined. It will fail soon, its just a matter of time. If you have the removeable sleeve, you replace the sleeve and just slide the prop over it and you are done.
The diminished thrust is due to the rubber slipping from its bond and it will get looser and looser.
the inside of the prop has a rubber between the prop itself and the inside splines to act as a shock absorber,say if you were to hit a rock. that rubber had spun out and the splines are turning inside the prop. the prop is screwed. seen it 100 times before.