Re: 1940 Johnson HD-15 Magneto testing

[joesnuffy]

I just can’t get this motor out of my mind. lol

I downloaded your video with youtube downloader and played it back slow speed several times with VLC media player.

I noticed that you have the speed lever pretty high. When I watch video motor seems to slow down then try and pick-up to high speed but just can’t make the transition to wot. It does this several times before it finally dies.

When I rebuilt my sea doo 2 stroke jet ski’s like 15 years ago they also have a rotary valve. The crankcase was suppose to be pressure tested using a leakdown test to check crankshaft seals. 2 of those seals are mounted to the center of crank and crank has to be disassembled and pressed back together to change them but you can change the outer 2 easily when rebuilding motor. Those seals are very important with a rotary valve and the case can’t leak either where it clam shells and bolts together. if they do leak you get a motor that won’t run correctly.

I wonder if when it was running if you could mist some 2 stroke fuel mix into the throat of carb and see if motor speed increases to wot or close. I have also heard people using some propane gas from an unlit propane torch. By doing this it might let you know if top and bottom seals are doing their job. I don’t know if that motor has an oil slinger on top instead of seal. It might also let you know if perhaps case might be leaking. Since you have motor back together wouldn’t be hard to check.

I also got all my electronics to build red atoms yesterday. I would be glad to mail you a couple at no charge once I build them. You could try one in that engine if it won’t work then you could put them into another 2 cylinder omc motor and see what you think about them.

I also noticed looking at the pics you didn’t put new wires from coil to brushes. Mumbles looks like he did. That one wire on the left in your picture going from the coil to brush looks pretty close to the coil laminate do you think fire could be jumping there??

Hope that helps,
Joe

Getting ready to go camping this weekend happy 4th!!! to everyone

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