so ill get right to it... my late model A4 engine was stalling out when giving it throttle, and wouldnt bring my 1973 C&C 30 above 3 or 3.5 knots. so i started by checking the fuel filter and it was disgusting. ended up getting rid of it completely because it was so bad.
i removed the copper tubing and put in all new fuel line, a new racor filter, cleaned the sediment bowl and screen on the manual pump (diaphragm appeared okay since it could hold pressure against my finger for 30sec or so), replaced the carb with a new one (old one looked like it had polyeurthane in it lol),
, installed the polishing filter between the pump and carb, i also stuck a hose in the fill spot and sucked out some crud and water from the bottom of the fuel tank. it does seem kinda dirty and golden yellow (not the clear with a hint when i put it in). I also installed new electronic ignition and lubed the distributor advance weights, new coil with new wire end connections now mounted on a bulkhead, and new spark plug wires (the plugs were only a few hours old).
the engine started right up and sounded better than ever, revved up with no hesitation at all in neutral. i was excited to test it out, expecting to go shoot up to 5.5 knots no problem.
well it didnt work that way, as always. it ran fine for 10 minutes to get me out of the fleet and moving along, but still only 3.0-3.5 knots at top speed... i was about to go down below to adjust the timing under load when the engine died. it was somewhat quick, and knowing the trouble shooting methods and signs i tried to start it again with the choke on. and it came right back to life, trying to close the choke it shut off on me again. i was able to make it back to my mooring by running with full choke only, anything less it wouldnt run.
i know this usually means the carbs main jet is messed up but this is brand new and has 2 fuel filters before it! i was concerned about water in the tank so i drained the RACORs bowl and the fuel that came out looked very clear (although still golden) and with no water.
i am going to pull the main jet just because i know thats what i should check first, but i just wanted to know what else could cause you to need full choke to run?
also, i still cant get above 3 - 3.5 knots at full throttle, i dont know if its an engine problem, (folding) prop fouling, dirty bottom, exhaust back pressure, or something i cant even think of... but that seems like a big drop from the 5.5 knots it used to do.
i removed the copper tubing and put in all new fuel line, a new racor filter, cleaned the sediment bowl and screen on the manual pump (diaphragm appeared okay since it could hold pressure against my finger for 30sec or so), replaced the carb with a new one (old one looked like it had polyeurthane in it lol),
, installed the polishing filter between the pump and carb, i also stuck a hose in the fill spot and sucked out some crud and water from the bottom of the fuel tank. it does seem kinda dirty and golden yellow (not the clear with a hint when i put it in). I also installed new electronic ignition and lubed the distributor advance weights, new coil with new wire end connections now mounted on a bulkhead, and new spark plug wires (the plugs were only a few hours old).
the engine started right up and sounded better than ever, revved up with no hesitation at all in neutral. i was excited to test it out, expecting to go shoot up to 5.5 knots no problem.
well it didnt work that way, as always. it ran fine for 10 minutes to get me out of the fleet and moving along, but still only 3.0-3.5 knots at top speed... i was about to go down below to adjust the timing under load when the engine died. it was somewhat quick, and knowing the trouble shooting methods and signs i tried to start it again with the choke on. and it came right back to life, trying to close the choke it shut off on me again. i was able to make it back to my mooring by running with full choke only, anything less it wouldnt run.
i know this usually means the carbs main jet is messed up but this is brand new and has 2 fuel filters before it! i was concerned about water in the tank so i drained the RACORs bowl and the fuel that came out looked very clear (although still golden) and with no water.
i am going to pull the main jet just because i know thats what i should check first, but i just wanted to know what else could cause you to need full choke to run?
also, i still cant get above 3 - 3.5 knots at full throttle, i dont know if its an engine problem, (folding) prop fouling, dirty bottom, exhaust back pressure, or something i cant even think of... but that seems like a big drop from the 5.5 knots it used to do.
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