I have a 50hp Johnson that I just rebuilt the carbs on and it now runs real rich on the top end. I have pulled all the jets, they are all clear, the floats are set properly and seal well. Compresson is 125/130, reeds look good.
These carbs are all fixed jets so no adjustments.
The engine idles great. On a slow throttle up, I get a slight lean condition, but one past that point it runs well up to 3/4 throttle. At full throttle, it goes really rich. I have run the engine with the flame arrestor off the front so I can see into the carbs as this is happening. as soon as the main jet starts feeding fuel, it goes real rich- to the point of spitting out the front of the carbs. If I pinch the fuel line to either carb, the rpm comes up as the carb runs dry. Both carbs have the same condition.
I have worked on engines all my life, but this one is stumping me. Such a simple carb, I must be overlooking something.
Thanks,
Anthony
These carbs are all fixed jets so no adjustments.
The engine idles great. On a slow throttle up, I get a slight lean condition, but one past that point it runs well up to 3/4 throttle. At full throttle, it goes really rich. I have run the engine with the flame arrestor off the front so I can see into the carbs as this is happening. as soon as the main jet starts feeding fuel, it goes real rich- to the point of spitting out the front of the carbs. If I pinch the fuel line to either carb, the rpm comes up as the carb runs dry. Both carbs have the same condition.
I have worked on engines all my life, but this one is stumping me. Such a simple carb, I must be overlooking something.
Thanks,
Anthony
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