Did you check the spark while it was hot or after it had cooled down? Coil going out will sometimes work when it's cold then quit after it heats up. Maybe it is the unburned fuel you are hearing and causing the occasional white smoke? Smell any gas in your oil? That would be a sure sign. Just something else to check but I'd probably still yank the engine and clean it, just did it to my 1864, not a bad job at all.
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