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Does anyone know of a chart that states octane requirements for older Honda bikes? I have a 72 CB 175 K6 and getting carbon on the plugs. I have looked in the Honda Service Manual and did not find any notation of octane, online was not much help either, besides one notation that Honda predicted...
I've just gotten a compression tester and tested compression on both cylinders on my '80 CM400T. Bike hasn't run in 18 or so years. I have not yet adjusted the valves, either.
Readings are cold.
Lt cylinder 158 psi
Rt cylinder 149 psi
Am I looking ok here? I know these are below spec (185...