I just put a 'Stens' universal ignition module on my SB-421.
Its finally showing a spark, but it's faint.
Ohmed out the mag and found it's shot (42,000 ohms).
I guessing the points/coil and mag went at once?
Since it appears the universal is working, i'm looking for a magneto for this model, if anybody has/knows of one.
Since I bought two universals, I'm looking to attempt to see if one will work on my 552/H55 engine.
Has anyone done this on the diode system yet?
(I posted this on "engines" board also)