I have a 1972 50 hp johnson that runs very rough idling. It stalls unless idling high. Today I ran it about 2 miles and as usual it ran very good above 1/2 speed. But returning it would never reach full speed. It seemed to be starved for fuel. I tried slightly closing the choke but it stalled. The low speed also runs like it is starved for fuel. I adjusted the low speed jets and it would level out perfectly but will only run about a minute before it stalls as if it runs out of fuel. The low speed jets can be adjusted to where the motor will run but it runs very irratic - a lot of jerking and smoking. After stalling it has to be choked to restart. The plugs have been replaced and they are correct. The carbs have be cleaned but I did not remove the plugs covering the low speed jets. I also haven't removed or inspected the leaf valves. The stator looks to be new but the coils are not new.
