Have you left the choke open ? this mixes more fuel to the engine upon starting but will stall it if left open too long . check your fuel filter too it may be full of debris.
SOURCE: tohatsu outboard 15hp 2 stroke was running great,
First: with flashlight or mirror look down the carb- with switch off- and gear and throttle wide open and see what the butterfly valve inside there is doing. It should be parallel to the air flow.
If not you need to find the actuator am and be sure it moves with the control and opens all the way.
Next make sure the timing plate under the flywheel moves at the same time the throttle is opened. Then -using timing light- see if the timing is set to the correct "wide Open throttle" - this is a 2 man job done at sunset with good marks on the flywheel (don't wear a tie). This can also be done static by running it out of gas and using the pull cord- if it has no safety interlock.
Last- and the saddest part- is the compression test. The strength of the reading is not as important as the similarity. When I worked on Chryslers, they were bad if the two readings were as little as 8# apart. The minimum reading should be over 80#.
SOURCE: I have a 1984 Mercury
Sounds like a simple fuel starvation. Simplest first- did you open the tank vent? Are you able to pump pressure with the primer when it starts to fail and make a difference?l. This would indicate a fuel pump problem or clogged filter. Then take a flashlight and look into the gas tank for water or **** floating round which might plug up the intake.
Harder stuff might be stuff floating round the carb bowl that gets sucked into a jet. I have seen a coil act this way when hot an shaken.
should always give it a compression test.
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