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Went into shop for misfiring and backfiring. did all tune up work except wires cuz i had some on order. it was still backfiring through both intake and exhaust. the new wires came in and i tried to install but they had wrong connection for plugs so I put the old wires on after cleaning up connectors. started and ran fine then the fuel pump died. brought it to shop to do pump, new wires and new plugs. ran ok on test ride with mech then started spitting and sputtering and he did carb work. he says cams had to be changed with carb mod. he said he needs the cam lift and duration to tune the carbs properly. I will check firing order tomorrow. comp is 155-165
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