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  1. M

    1975 7.5 HP WOT Power loss

    I have a 7.5 Hp Thunderbolt and was having a problem with the motor surging at wide open throttle. was on the boat today and now I have no surging but a def. loss in top end power. and at idle the motor will stall.And squeezing the primer bulb doesn't seem to do anything for the motor. Even...
  2. M

    78 Mercury 7.5 thunderbolt

    I have a 7.5 horsepower mercury outboard that has been driving me crazy and I need help. I love this motor but lately it's been surging alot at all rpm ranges. I tried everything ,changed fuel, cleaned carb, checked spark,changed plugs, and it still surges can anyone guide me on where to look...
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