> ... the right cylinder ( oppose to fuel tank one ) doesn't fire okay and has misses. I see a black wetness out of the exhaust pipe.
Pull the plug from the left side and check compression feel on the right side. Then check the compression on left side, too. Does the right side feel soft? Low compression generates less combustion heat. A wet pipe could mean insufficient heat to burn off the fuel’s oil. Low compression would also create misfires.
Valve leakage is not uncommon in these engines, so you may need to lap the right side.
> ….. Haven't added any oil to crankcase….
Both ends of the rods and the crank journals need lubrication.
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