FrankR wrote:I think you are barking up the wrong tree (carb tree). There is something wrong with that top cylinder. You claim the spark is not the issue, so look for something else. Crankcase sealing? Water getting into cylinder? Scored piston? Busted reed? But first double check the ignition.
The smoke is because the top cylinder is not burning its fuel, but is discharging it into the exhaust.
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