Hi Johnnyc,
I have a friend with a small boat with a six year old 70 horse Johnson, it has a similar problem like yours. When the motor is being run onshore it will run fine, but in the water under load it won't restart, or it will bog down.
He's had the power pack and stator replaced, they've checked fuel and wiring, and two different shops have been unsuccessful.
He's had nothing but problems with this motor from the beginning, and is currently having a 75 horse Honda installed. He's giving up on the 2 strokes, problems could possibly be from the new fuel with ethanol.
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