Bosch Blue coil

[jack casey]

My experience is coils are either good or fail miserably. I have not found one in a gray area

Slow cranking would be caused by a bad battery, corroded, dirty, or undersized battery cables, bad electrical connection on any of the battery or starter cables, bad bearings in starter/generator, worn brushes or commutator in starter/generator, bad armature in starter generator, or non-functioning compression release in the engine. The ignition system has absolutely nothing to do with how well the engine turns over.

I griped about slow cranking or what I thought was slow. Then I saw three videos about Cubs with snowthrowers. Three forum members started up their Cubs, of various vintage, and all three were slow cranking, like mine. I complain no more.
All the love, Jack