Home › Forum › Ask A Member › 1940 Johnson HD-15 Magneto testing › Re: 1940 Johnson HD-15 Magneto testing
I think your motor has no reed valves? and an unusual way of getting fuel (rotary valve) I think thats why it has the brushes are used to kill spark to the cylinder that doesn’t need it because piston is at BDC. I think the zephyr also uses a rotary valve.
Definitely no reed valves in these units.
Did you ever determine what size condenser/capacitor value to use?
The charts says to use a .18 mfd condenser, and I figured a .2uf cap
was close enough, but that could be something to experiment with
You may still want to see if both plug wires fire with the Stevens Meter hooked up to coil and 1 not grounded with the .2 I suspect they will.
I’m guessing I can get both sides of the coil to fire at once if one secondary is hooked
to the Stevens unit and the other is close enough to the mag plate / ground, or hook it up
to a spark plug with it’s base grounded?
Will read through all your thoughts and try to formulate a "battle plan" for today!
Thanks again!
hope that helps,
Joe
Prepare to be boarded!