I have a method of assessing comparative firing voltage. Purchase an NE2 Neon lamp from radio shack or other. It is the size of a dash light bulb with two wire leads out the bottom. Attach a stranded 20ga insulated wire to both leads. Make one about 20" and the other long enough to go to a spark plug wire from the operator"s platform or driver"s seat. Wrap the spark plug wire with 15 turns of the 20gauge wire and tape in place with black electrical tape. Leave the end free!
Ground the other lead to the chassis.
At night, or in a dark building (with appropriate venting) run the engine. An put it through load variation. The neon light will dim and brighten as firing voltage changes.
Best of luck, and interesting (I am willing to be wrong) but not yet, I have seen too many spark lines on the scope. Jim
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