lefty wrote:Not sure if this is important but when I tested for spark with my light, I couldn't see the light-up until it started. In other words, 3 or full good pulls with no indication of spark. Then it would fire up and I could see the light. I was inside my garage at the time so there wasn't any light pollution to contend with.
It does sound like you have a weak spark. It may the spark plug so if you haven't changed try a known good plug. Or it could be weak flywheel magnets or too large air gap between the coil and the flywheel. Here I use a standard business for a gauge as most coils are gap at around .010"-.012". Also use my repair tag card stock as a gauge.
lefty wrote:Is there a ballpark for the proper resistance?
As I said I only work one of these Muruyama units. But being a coil with the electronics inside it usually you can not test them other the secondary (Plug side). If there is problem in the primary side it is more likely to be the electronics anyway as the coils that I have taken apart have a fair robust primary windings.
If anyone out there that has one these Muruyama and has the time please check you coil resistances and report them so we could have at least basis for testing purposes. I would hate for Lefty have to buy a $100 ignition coil just fine out that his is good. But something is definitely off with the primary resistance reading he is getting. May have an internal colder solder joint.