Re: 1940 Johnson HD-15 Magneto testing

[joesnuffy]

I made a mistake on this please disregard I see what your saying that bakelite would have to be off 120 degrees. Looking at everything it could be most likely not since I am sure you paid strict attention. Since motor fires at the 0 degree mark then 6.8 ohms would return about 20 degree mark then motor would fire at 180 degree mark and 6.8ohms would return about 200 degrees if you rotated the bakelite 120 degrees to the right. I wonder if someone has a picture of where tab should be in correlation to flywheel key?

Motor needs to be checked for double fire. I think that can be done using a drill or rope no need to start motor. By spinning flywheel if timing light lights up both marks you made when hooked to one plug wire then its double firing. You may get double fire on one cylinder and not the other but that would let you know which brush system isn’t working.

If your getting double fire on both cylinders something is wrong. Looking at your diagram it would almost make more sense if motor spun the opposite direction. If you do get double fire testing then try spinning the flywheel in reverse to see if you get double fire??

I know some outboards were made that run counterclockwise but most likely not one with only 2.5hp. My Yamaha 2 stroke golf cart runs both clockwise and counterclockwise. Clockwise for fwd and counterclockwise for reverse.

Also look at prop see which way it cuts the water by rotating the flywheel clockwise to see if that’s correct.

Joe

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