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These petcocks are known to leak through the carbs and cylinders and into the crank case. Happened to me even after installing a brand new petcock. Parked it for years and an entire tank of fuel ended up flushing through the crank, diluting/displacing oil. Ultimately it all drained down to where the clutch cable enters but presumably could have been higher at some point. Could it possibly end up in the exhaust instead? Not sure, but it might explain the condition of those cylinders.
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