1978 70HP Johnson bogging on takeoff

oldsub86

Petty Officer 1st Class
Joined
Sep 9, 2008
Messages
311
My son's 70 HP is acting up this weekend.
It starts normally and it runs fine at higher speeds.
It wants to stall when one shifts to forward and gives it some throttle.
Moving the throttle back and forth seems to keep it going until it takes off and then it is good until you slow down again.

Put in a new inline fuel filter. Added some Seafoam to the fuel tank. Had a new fuel pump last year.

Anyone got a good idea what might cause this?

Randy
 

Haffiman

Commander
Joined
Dec 17, 2009
Messages
2,454
Re: 1978 70HP Johnson bogging on takeoff

Start with a compression test and post the readings.
 
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