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The very first thing that would need to be known is if the engine has spark or not when it stalls. Have you checked for spark output with a timing light when it stalls? If yes, does it have it or is there no spark?
The engine might have weak spark. Do you have a hand held voltmeter to measure the voltage at the coil with the engine running?
Is that 12 volts when the engine is running fine or 12 volts when the engine is running poorly?
It is points ignition so there is a resistor wire. When running it should actually be closer to 10-11. Are you guessing when you say 12 volts, or did you actually measure it when the engine is running?
Are you working on this engine yourself or are you working with a mechanic that can not figure this out, and relaying information to you?
Understood. This should not be to hard for the mechanic to figure out, but he does have to duplicate the problem first. When the engine runs fine there is nothing to test for because the engine is running properly. That being said the engine needs 3 things to run. Compression, spark and fuel. Compression never changes, so the engine Is loosing either spark or fuel. The easiest thing to do is duplicate the problem first, and then after that use a tool called an adjustable gap spark tester, this measures the actual spark intensity, and it will tell him if the spark is strong, or weak. If it is weak then he goes back to measuring voltage again. If the resistor wire is starting to burn up that can cause low voltage to the coil when hot. But if spark looks good, then you are looking at a fuel problem. The next step would be running the boat off of another fuel source like a portable tank. If it runs better immediately, there is some kind of blockage or vacuum buildup in the boats fuel tank. If there is no change, then that narrows the problem down to either the fuel pump or the carb. From there fuel pressure can be tested, it would need to be between 3 and 7 psi. If it is low, the fuel pump is the problem. If it is fine, the problem is inside of the carb, and probably is a little dirty and has a sticking float. Does that make sense?
You are very welcome and I was glad I could help.
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