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This is apples vs. coconuts, but may have some relevance:
1. In BMW oilhead boxer horizontal twin 4 valve/cylinder motorcycle engines, surging is a big problem, so various sparkplugs and gaps have been tested. 4 prong and platinum or iridium plugs make the problem worse, impede the flame front, and degrade fuel economy and power. Best power, fuel economy, and surging relief are with plain old cheapo single prong Autolites set at 0.038 or as wide as possible as long as she runs well.
2. Aircraft Spruce & Specialty Company sell inexpensive cylinder head temperature sensors, actually little rings that fit between sparkplug and head with a wire to the readout gauge. Maybe such should be used in conjunction with testing various spark plugs and gaps among the cylinders.
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