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78 cb750 will not start backfires through exhaust.

DouginIa

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The bike is a 750f with 5700 miles it had sat for several years before I bought When I first got it, it would run but not idle and not seam to have any power sometimes it would backfire through exhaust shooting flames out and making a loud bang. Now it will not start at all and backfires out the exhaust. I have just had the carbs rebuilt
Thanks
 
So it got worse sense the carb rebuild? Or you had the carbs rebuilt to try and fix the problem? Backfiring sounds like an ignition problem. Have you replaced plugs, check points, advance plate, ignition timing, etc?
 
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