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76 johnson 55 stalls in gear

J

Jmfeelgood

New member
My 55hp runs great with muffs. In water it idles fine but when I put it in gear and throttle up it dies. I took off the cover and turn the throttle by hand while putting it in gear it will run. Any ideas?
 
When I throttle up with the controls it bogs and dies even with hood off. Visually it seems to be working fine. When I have the muffs on it revs fine with the controls. Only in the water do I have this problem.
 
If you have proper compression and spark on all cylinders, what you are describing is either fouled carburetors, in which case they will need to be removed and cleaned... or the throttle butterflies are opening too soon.

The butterflies should just start to open when the scribe mark on the metal cam is aligned dead center with the throttle cam roller.

The high speed jets are located horizontally in the bottom center of the float chambers (way in back of the drain screws). Best to clean them with a piece of single strand steel wire as solvent just doesn't do the cleaning job properly on those items.

Check the slow speed needle valve adjustment as follows.

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note 1: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.
 
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