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Hello, I have a 1977 cb750a that has no spark when I use the igniton switch. If I use a jumper wire between terminals on plug for ignition switch, starts right up. Took apart switch, everything looked good, nothing burned or melted. I get continuity on the switch between bat and ignition and...

My 1977 CB750A has an interesting condition and I was hoping someone might have an idea. When I turn on the ignition switch, occasionally I will her a loud pop-like a firecracker. The bike still runs, but what would cause this to happen and how can i stop it from happening? It does not happen...