1975 70 hp Johnson

J

Jarhead08

Recruit
Joined
Jul 27, 2013
Messages
3
Motor idles fine and runs well. However upon acceleration just before coming up on plain it bogs down. New gas lines, flow of fuel is good to the motor. Carbs were just rebuilt and adjusted. What could be causing the motor to bog down and not hit top end? Maybe carbs were not cleaned correctly (jets)? Am at a loss. I've tried everything just short of taking the carbs off myself and redoing them. Any ideas? Thanks!!!

Semper Fi
 
B

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1975 70 hp Johnson

What happens if you hit the choke when it bogs ??
 
Watermann

Watermann

Starmada Splash of the Year 2014
Joined
Jan 12, 2013
Messages
13,753
Re: 1975 70 hp Johnson

Welcome aboard Jarhead.

Does the motor bog down and die unless you let off the throttle or just stay at low speed? How do you know the flow or fuel to the motor is good? Did the fuel lines get replaced too when the carbs were rebuilt? How about the fuel pump was it rebuilt or replaced? Does the primer bulb stay tight or go soft? Is your fuel tank venting properly?
 
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