Re: Rough spot
Check to see if the rough spot will come in when vehicle is sitting still ,I had a 53 engine that was rebuilt and balanced that had a vibration like you are speaking of ,it seemed to be more like a surging ,it would peak and go away intermittently, Kind of like a wave ,never actually found the cause ,I swapped out the carb and ignition just because I had a spare sitting on the shelf, have you tried pulling the choke partly on while this is taking place, does it do this while sitting still and slowly revving the engine ?
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