'79 johnson 70 hp lost wot

jstart1

Recruit
Joined
Jun 28, 2003
Messages
2
Idles fine, seems fine on garden hose, but when in the lake severe loss of power. New plugs, cleaned carbs, and one leaky fuel line feeding bottom carb. Could a leaking gasket on the air cover be doing it all? Or should I go back and start at the carbs?
 

Joe Reeves

Supreme Mariner
Joined
Feb 24, 2002
Messages
13,262
Re: '79 johnson 70 hp lost wot

Jstart.... If you have approx 100+ psi compression on all cylinders, and (w/plugs out) spark that will jump a 7/16" on all cylinders, in all probability your carburetors are fouled and will require cleaning etc.
 
Top