1966 3hp Johnson Seahorse problem

[Dougpenn]

I picked up a 3hp Seahorse and after some carb cleaning i got it to run. It ran smooth for about 10 mins and then developed a high pitched squeal. The motor then shuts off. Any idea what it could be?

 

[racerone]

Did you replace the water pump impeller ??---Gas and oil mixed at 24:1 on this fine motor ?

 

[Dougpenn]

It looked to be pumping fine but just ordered a impeller and wear plate. Gas/oil mix was 50:1.

 

[Dougpenn]

Side note, the impeller looked to be fine but i ordered a new one since i have it down that far.

 

[F_R]

The oil mix is sure to reopen the Great Oil Debate, but 50:1 is what Johnson said. I doubt that was the cause. But who knows?? My first guess is a dry or rusted needle bearing, except that motor doesn't have any.

 

[Dougpenn]

Lol. Ill mix up a closer ratio for the Gas/oil mix. Ill put it back together all nice and clean. Make sure its oiled up good and see if that fixes it.

 

[lindy46]

I'd run 24:1 in that motor.

 

[kbait]

Pull spark plugs and pull it over to see if you can detect any binding. Maybe something rubbing under flywheel?

 

[Mohawkmtrs]

I agree with kbait but also check out the manual starter as well.

 

[oldboat1]

Is the motor overheating? Too hot to touch under the head? It may be that the water tube is blocked by a damaged grommet, or not in the grommet. Could be the water passage around the cylinders is blocked somewhere.

Motor may be seizing up when overheated.

[If running in a test barrel, the water must be well above the impeller.]