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  1. C

    Johnson SeaHorse 70 getting slower

    Bought a '93 21ft pontoon with a 1981 Johnson 70hp outboard. It ran pretty quick when I bought it this spring, but over the weeks it has gotten much slower. Motor cranks right up, runs and sounds great. No sputtering or smoking. Replaced spark plugs. Prop is in fair shape. Pontoons are drained...
  2. C

    Sounds like something slipping.

    My father in law has a 1981 70 horse Johnson 3 cylinder 2 stroke. Serial number can be provided if needed.<br /> Took his boat out and the motor sounds good and responds to throttle well. It ran well and then lost push. It seemed like something in the drive was slipping. When this happens the...
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