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thanks for the input. 1&4 are completely clean, I have replaced the coils, wires, and ends, with new ones last week with no good results 2&3 still black. I put in new plugs and test drove it and in 20 miles they were black already. P.S. Can you tell me it the (black and white wire from the...

Sorry i failed to post that i have installed new plugs twice and replaced both coils and wires i still have black 2&3 plugs. Today I retested the the spark out of each plug. just looking at each plug firing they all look the same and great. I then bypassed the bike harness and put a jumper...

Hi I’m new to this forum but I have read several of your posts. Well here’s my problem. I have a 1974 cb750K that I have been battling black spark plugs only in number 2&3 cylinders ever sense I bought the bike two years ago. The plugs are black and sooty with no wetness and no smell of fuel...