THE LAST TWO TIME I WAS ON THE LAKE THE MOTOR WOULD START AND RUN FINE FOR THE FIRST 5 MINS AND THEN IT WOULD START MISSING LIKE IT WAS NOT GETTING GAS. IT WOULD DO THAT FOR A FEW MINS AND THEN IT WOULD RUN REAL GOOD FOR THE REST ON THE DAY. I HAD IT TUNE UP IN MAY.ALSO HAD THE CARB REBUILT TO. COULD IT BE BAD GAS?