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I have a 1972 CB750 K-2 with 23,400 miles on it. I rebuilt the whole bike from the ground up in 2002 and have just fired it for the first time since 1992. I just last week rebuilt all the carbs. The bike is original except for an allan key bolt set and a Dyna S ignition. Now that it runs it runs very well above 4200 RPM but below that the #1 cylinder backfires quite a lot. I have changed plugs and checked all the electrical connections and grounds. Coils and wires as well as plugs are all OEM new. New gas also -- before anyone asks. Would this be a timing problem with the Dyna or maybe a bad coil?? Any suggestions not costing thousands of dollars would be appreciated.
Thanks
Dave
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