Home › Forum › Ask A Member › 1940 Johnson HD-15 Magneto testing › Re: 1940 Johnson HD-15 Magneto testing
With rigging up the flywheel take a omc coil and a piece of plug wire put one side of plug wire into omc coil like normal on the other side ground it to your flywheel. Note: flywheel is off engine sitting on work bench. Then hook up omc coil like normal to stevens tester and use the probe to go around checking bakelite and brass tab for arching. Bakelite shouldn’t arch tab should ark. Does that make sense or am I off base on that.
I am guessing you got 2 lobes on the cam that opens points. Thats how I would make my marks when the points open for each respective cylinder. You are right in what I am thinking timing isn’t the issue but double firing might be happening that is what I think my test might determine
Joe
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