martin_csr wrote: Sooty black or oily black? Sooty could be poor ignition on that side: bad spark plug or incorrect gap, problem w spark plug wires or connections. Make sure the spark plugs are correct & properly gapped. Redo the spark plug wire connections. If it is the original coil, maybe consider getting a new one? If you have points ignition, make sure it is properly adjusted. Clean & lubricate the advancer.
Sooty black.
I'll check timing and spark tonight.
