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    1977 70hp 70el77s power loss

    Hello, I am having problems with my 1977 70hp Johnson, we have placed a jet pump on the motor and are having problems when we throttle up, it is not pushing properly and not getting the boat on plane. The pump is set at the correct height and there is no cavation problems. Previously had the...
  2. G

    1977 70hp Johnson No go when throttle up

    Hello, A friend and I purchased a 16' 1970 Hourston Glasscraft that had a 1977 70hp Johnson on it, we recently put a jet pump onto the motor and within a few weeks had the motor blow a whole in the block on the lower 3rd piston. Now the motor was previously used in salt water for years and the...
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