1957 35hp johnson

[Mikec53]

I changed points in my motor. It has great spark. Took boat to the lake. It started on 2nd pull and ran about 10 seconds then died. It wouldn't even sputter after that. Before I changed the points it was very cold blooded. When I did get it to run it ran great then suddenly died. That's when I pulled the flywheel and discovered the points for bottom cylinder were way out of adjustment. Was so worn couldn't get close to specs. Now I did a compression check. I pulled it 3 times on each cylinder. Both came out on the gauge at 90 psi. Is that ok? Just trying to figure it out. Its frustrating. I just bought the motor a couple weeks ago for a great deal.

 

[racerone]

Pressure tank in good condition and with cap closed ?-----Post picture of the magneto.-----Is the oiler wick for magneto cam in place?

 

[oldboat1]

^+1 on the pressure tank. I would replace coils, points, condensers, plugs and plug wires along with the impeller. '58 takes the wire core 7mm plugs to coils.

 

[racerone]

Inspect parts before rushing out to invest beer tokens in new parts.

 

[oldboat1]

Coils cost a few tokens -- probably good to go if the casings are not cracked.

 

[Mikec53]

Pressure tank in good condition and with cap closed ?-----Post picture of the magneto.-----Is the oiler wick for magneto cam in place?

Yes pressure tank is good. Cap seals when closed, the primer in it works and also builds pressure when motor is running. The oiler wick is in place on cam.

 

[Mikec53]

^+1 on the pressure tank. I would replace coils, points, condensers, plugs and plug wires along with the impeller. '58 takes the wire core 7mm plugs to coils.

I replaced the points and condensers. I checked the coils and they were good. I tested spark after I put it back together. Has nice strong spark on both cylinders. Fuel tank is good also.

 

[racerone]

Those coils are recent replacements.----Good to go.

 

[Mikec53]

Those coils are recent replacements.----Good to go.

Yes has good spark. I'm thinking it mite be a fuel problem. Found out motor Has been sitting since 2018. Has 90 psi compression on both cylinders.

 

[oldboat1]

low to mid 120s psi on a pair of '57s I had three or four years ago. Maybe a new head gasket or a retorque of the current one would help on yours, or just running the motor. If you have the sintered filter in a glass bowl, try it without the filter. For the bowl, a good flexible gasket is critical.

 

[jimmbo]

Yes has good spark. I'm thinking it mite be a fuel problem. Found out motor Has been sitting since 2018. Has 90 psi compression on both cylinders.

When taking the Compression, was it done cranking the Motor with the Starter, or using the Recoil? If using the Recoil, that Engine has a Compression Relief System which lowers the Compression to make it easier to pull the Rope, and it would need to be disabled to get the true Compression numbers. If cranking the engine with the Starting Motor, ignore the last Sentence

 

[hardwater fisherman]

I changed points in my motor. It has great spark. Took boat to the lake. It started on 2nd pull and ran about 10 seconds then died. It wouldn't even sputter after that. Before I changed the points it was very cold blooded. When I did get it to run it ran great then suddenly died. That's when I pulled the flywheel and discovered the points for bottom cylinder were way out of adjustment. Was so worn couldn't get close to specs. Now I did a compression check. I pulled it 3 times on each cylinder. Both came out on the gauge at 90 psi. Is that ok? Just trying to figure it out. Its frustrating. I just bought the motor a couple weeks ago for a great deal.

You said you pulled the rope 3 times to check compression. You should pull until the needle stops moving. So perhaps the compression is actually higher?

 

[Mikec53]

When taking the Compression, was it done cranking the Motor with the Starter, or using the Recoil? If using the Recoil, that Engine has a Compression Relief System which lowers the Compression to make it easier to pull the Rope, and it would need to be disabled to get the true Compression numbers. If cranking the engine with the Starting Motor, ignore the last Sentence

Oh ok. It only has pull start. I'll have to disconnect the pressure relief and see what results I get.

 

[oldboat1]

Maybe pull both plugs while testing, cranking/pulling over until needle stops, as indicated. (Throttle does not need to be open on a 2-cycle.)

 

[Mikec53]

Is this the nut I would loosen to adjust the needles for low and high lean/rich? They are in front of the air intake box and behind the front cover plate.

 

[Crosbyman]

 

[Mikec53]

View attachment 360210

Can I adjust the jets without taking the carb off the motor?

 

[jimmbo]

That is why the Mixture Needles extend out of the motor cowling, so you can adjust them

 

[racerone]

Back in the day most folks learned how to adjust the carburetor.----You had to compensate for local atmospheric conditions .----Compensate for water temperature.----The adjustments were right there for a operator to use while underway to the fishing hole.