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My 1973 Evinrude sportster 25 Hp outboard motor starts like a dream. I can crank it any day without a hitch. The problem only comes when I put the motor in gear. Once the motor is in gear(forward), and the accelerator is turned the motor revs high, sometimes convulsing. Not convulsing consistently but minor jerks at times. If I maintain about 30% on the throttle I notice no issues with the motor apart from going very slow. Something feels like it is not catching. Nonetheless while in gear, the prop still continues to spin. At top speed with this problem my boat only runs 5 1/2 mph. At full operation the motor pushes my 14 foot boat at 22 mph with no passengers.