This is a 2 cylinder horizontally opposed engine. The coil has 2 output connections, one for each cylinder. The coil sends spark to both cylinders at the same time. One cylinder is on the compression stroke and fires the gas/air mixture and the other cylinder fires on the exhaust stroke. This is called a waste spark engine, since the spark to the cylinder on the exhaust stroke is wasted. The engine doesn't really quit, it just quits firing on one cylinder, the other one keeps the engine running, just without any power. It has enough to get back to the shop. I believe I did a compression check in that condition, but not sure at this time. I remember putting a neon timing light on it, one side at a time and one side showed fire and the other did not. Does anyone know if this style coil can fail in this mode? I assume it has 2 high voltage circuits isolated/insulated from each other in one case. If it only had one high voltage circuit feeding 2 spark plugs, I think it would probably only fire the plug with the least resistance, which I assume would be the plug in the cylinder without compression.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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