1978 70 hp Johnson / No Power [ Ol' Paw's Boat Motor Bulletin Board ] [ Ol' Paw's Fishing Page ] Posted by Bob Machowski (68.229.84.149) on January 14, 2006 at 14:19:26: Hi, I have a 1978 70hp Johnson, it is on a 14' Larson. It had been professionally rebuilt 4 years ago and still had no power to get on plane. After being told my boat was saturated with water I replace the entire floor and transom. Still no power. I gave up and let it sit. Now I had a new guy work on it and he replaced the coils and rebuilt the carbs and even tried another carb on the lower of the three. He admittedly is a fairly new mechanic. He says if he sprays fluid around the intake at the base of the lower carb (not in it) the motor changes. Could this be related to the intake gasket (behind the plate for all 3 carbs) or the reed valves? Once on plane the motor has plenty of power. Please help

1978 70 hp Johnson / No Power

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Posted by Bob Machowski (68.229.84.149) on January 14, 2006 at 14:19:26:

Hi, I have a 1978 70hp Johnson, it is on a 14' Larson. It had been professionally rebuilt 4 years ago and still had no power to get on plane. After being told my boat was saturated with water I replace the entire floor and transom. Still no power. I gave up and let it sit.
Now I had a new guy work on it and he replaced the coils and rebuilt the carbs and even tried another carb on the lower of the three. He admittedly is a fairly new mechanic. He says if he sprays fluid around the intake at the base of the lower carb (not in it) the motor changes. Could this be related to the intake gasket (behind the plate for all 3 carbs) or the reed valves? Once on plane the motor has plenty of power. Please help