On Sun, 01 May 2016 18:49:02 GMT, Johnny B Good
wrote:

snip

I'd guess what is actually hidden away under that plastic cover rather
depends on the vintage of that B&S engine. If it's using 21st century
technology, there's every chance there's a transistor or 3 involved.
Earlier than that and it's likely to just consist of nothing more
sophisticated than a set of CB points and a 500v 100nF capacitor.

Or neither, possibly just a coil driven from the flywheel, handling
both the generation and timing of the spark:

https://dl.dropboxusercontent.com/u/...ing_5_pole.pdf

snip

Cheers, T i m