1977 johnson 70hp bogging at full throttle

ddswulf

Recruit
Joined
Jun 13, 2003
Messages
3
ran fine one day then the next it bogged while cruising at 3/4 throttle, when i came out of the throttle it ran slowly just fine then when i pushed the throttle it bogged again. i have isolated it to the bottom carb or cylinder. i ran motor at high idle and sprayed carb cleaner in each one top two carbs both made the motor rev up, motor bogged when i sprayed in bottom carb. i also changed plugs to make sure not fouled.i checked for fire on each cylinder and all were good. i think that that carb is giving too much fuel, is there any kind of adjustment i can make?
 

53150

Cadet
Joined
May 2, 2003
Messages
28
Re: 1977 johnson 70hp bogging at full throttle

Sounds like we are having the same problem. Are all three carbs. on your motor the same. The bottom carb on mine doesnt have the intermidiate circuit. and no small tube running through the center.<br /><br /> Thanks <br /> Will Vaughan
 
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