Question about Light Outboard Motor Boat Bass Fishing Saltwater Base

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Boat motor while in water revs extremely high after about half throttle with no additional thrust

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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.

Posted on May 06, 2010

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My 15 hp 4 stroke is pushing my boat as fast as it can at half throttle any more throttle and it just revs up and it goes slower and I just put a new hub and prop on what could be causing this?


Hi Michael.
Generally when that happens the prop is cavitating,
Possibly did the person that sold you the prop, gave you the wrong pitch? if it's smaller they tend to over rev causing it to cavitate
Good luck........

May 13, 2016 | Boating

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Went for a trip and all was going well then 15min in the trip slowed down and motor started to run rough and was unable to rev out or get on the plan had to limp Back to the ramp. Since then I have ch


Firstly we need to know the motor that we are talking about
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My motorguide trolling motor keeps tripping the 50 amp in line breaker every time I turn it on high speed. It is a 75 lb thrust digital tour model. When I take it out of the water and run it on high...


All motors will draw higher amperage with varying loads. Your hi speed motor winding has probably shorted some its winding's without having gone to ground. It probably needs to be replaced to get your hi speed back. I have run into similar problems in heavy commercial hydronic pumps. Best to have mechanic check it out. An OHM test with factory specs. will tell for sure.

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Boat does not plane


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

Jul 10, 2010 | Light Outboard Motor Boat Bass Fishing...

1 Answer

Brand new 350 motor rev's fine but will not pass 2000 rpm in water boat is a 23' 1988 starcraft


We are going to assume there is no Rev limiter in the ignition circuit.
Disconnect the throttle, move the throttle lever by hand and see what RPM you pull. It should be able to go higher than when you had a load on it. Check your throttle stops.
If you have a 4 barrel with a secondary, look at the mechanical linkage. If you have a vacuum operated secondary, see if you have any open vacuum ports.
If this is a vacuum secondary, there are springs you can buy to change when the pulldown occurs.
Check for a clogged gas filter, kinked hose, or hole in the gas line before the fuel pump.
If this new engine is running the same carb and ignition as the old motor, check your base timing and advance.
If you have not used this boat before the new engine was installed check your prop pitch and size. The prop is like changing gears, you need to adjust throttle stops so you do not over rev or under rev. Let us know what you found.

Sep 15, 2009 | Boating

2 Answers

When the boat is in nuetral it can rev up when it is in gear out of the water it runs good when it is in gear motor lowered in the water it wont go above 1000 rpms yet when i take it out of the water and...


The last comment you made about the hose cuffs and running good- Was that in gear or neutral? If you are using the boats throttle lever there is a cam lever for the choke which limits the throttle. It may be out of sync in the control box. If you have operating cables disconnect them at the engine and see what range of motion you have in the motor itself. Then hook up the controls and see if the cables prevent the motor from opening the carbs.

Aug 01, 2009 | Light Outboard Motor Boat Bass Fishing...

1 Answer

Boat not responsive


hi, thats a little motor for a big boat. how big is the boat? you can try changing the timing by loosening the distributor cap and turning it slightly to see if that helps or you can get a different prop that has less pitch on the blades which will spin the prop faster in the water and keep you up in powerband better. maybe call a marine boat shop and tell them your problem, maybe they have a trick or two. happy boating J

Aug 15, 2008 | 1989 Ford Taurus

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