All good that you've found the problem, and sorted it out, Leo.
A 4 stroke ignition module would only fire half as many times as a 2 stroke module.
Not so, in practice - they are triggered by the induced voltage across the coil primary winding, so in common with distributorless car ignitions, they fire every revolution. Just means that a waste spark occurs near the end of the exhaust stroke.
AVB, I suspect that we are at cross-purposes due to terminology.
I've never found
THIS type of 'compression test' gauge to be of any real use in indicating 2-stroke crankcase compression. Edit: As you have also previously said,
HERE A
leakdown test [or I guess leak-up, if you start with vacuum], with the hand pump setup that you use, is a very different matter indeed, and really the only proper way to go about it.
