evinrude 70873c 1978

by Dave Thomas
(Knoxville, TN)

Engine will start and idle though it is a little rough. It will accelerate but a few seconds into higher rev it will seems to bog down and then surge until eventually it will slow down. It will run almost long enough to get on plane, but then surges until it slows back down.

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Apr 13, 2026
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no power
by: Terry B

Sounds like either a fuel problem or Carburetor needs cleaning. Try new fuel and add some Sea Foam and run it for awhile then let it sit for a few hours then retry. Does you tank have a air valve on top if so make sure its open. Change spark plug. Next step replace fuel pump there cheap and filter if this does not work get the carb rebuilt.

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