Spring Loaded Head

Why does my garden tiller quit running after a few minutes?

My tiller has a 6hp Tecumseh engine on it and I have had to (at times) operate it with the choke lever in the half way detented position. This suggested a fuel delivery issue to me. I changed the fuel line between fuel tank and carb and eliminated the filter, just as a test. I also tweaked the carburetor settings on both main metering jet and idle screws. But it just runs rough and then will die after 3 - 4 minutes. When it dies, there is fuel in the carb bowel when I depress the sediment drain spring loaded device. I plan to replace the spark plug next and then possibly remove and clean carburetor. I am suspicious of a possible leaking head gasket (I can see a little black exhaust goo coming out of one side) as well as a weakening / failing magneto and / or an issue with the valves.
Any one a good small engine service man?

check the gas cap it should have a vent hole in it next loosen the screw's on the magneto and re tighten rust here is bad don't forget to re gap best way put a business card between magneto and magnets on flywheel loosen bolts and let magnets pull magneto in than tighten bolt spin flywheel to remove card
head gasket probably isn't it but check the valve clearance i think clearance is 10 thousandths grind valves with lapping tool if they look bad

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