kerry_smith
New member
"I have a 1954 Evinrude 25hp O
"I have a 1954 Evinrude 25hp OB. I have rebuilt the carb, replaced the plugs, checked the gap on the points, done the hokey pokey, and adjusted the cam for the throttle linkage. It now runs well, not great but well. After trolling it seems to smoke more than it should, runs a little rough then levels off after a few minutes. I can live with that.
My current issue is that after shutting off the motor I have to disconnect the gas line or open the gas tank top to relieve the pressure and fuel from then coming out of the carb in a steady flow. The float appeared okay during the carb rebuild, but may need to be replaced (?) for good measure. My shop manual does not show where the airlines go but there are two. I went on the assumption that the locations were correct when I started the project. One airline goes from the bottom of the carb manifold to the airline that feeds back to the fuel tank. The other goes from an unknown diaphragm cylinder to the right of the carb and runs to the manifold. (There is also a wire connected to the mystery diaphragm cylinder from the bottom of the flywheel area). The adjustment needles appeared okay but were not replaced, the high speed one is a little worn, and very sensitive to adjustment.
The fuel tank has no markings on it but appears to be old. Two lines, air and fuel, large cap, small hole in side of cap, no pressure valve.
Any ideas on the flow?"
"I have a 1954 Evinrude 25hp OB. I have rebuilt the carb, replaced the plugs, checked the gap on the points, done the hokey pokey, and adjusted the cam for the throttle linkage. It now runs well, not great but well. After trolling it seems to smoke more than it should, runs a little rough then levels off after a few minutes. I can live with that.
My current issue is that after shutting off the motor I have to disconnect the gas line or open the gas tank top to relieve the pressure and fuel from then coming out of the carb in a steady flow. The float appeared okay during the carb rebuild, but may need to be replaced (?) for good measure. My shop manual does not show where the airlines go but there are two. I went on the assumption that the locations were correct when I started the project. One airline goes from the bottom of the carb manifold to the airline that feeds back to the fuel tank. The other goes from an unknown diaphragm cylinder to the right of the carb and runs to the manifold. (There is also a wire connected to the mystery diaphragm cylinder from the bottom of the flywheel area). The adjustment needles appeared okay but were not replaced, the high speed one is a little worn, and very sensitive to adjustment.
The fuel tank has no markings on it but appears to be old. Two lines, air and fuel, large cap, small hole in side of cap, no pressure valve.
Any ideas on the flow?"