The fuel spray bottle in this specific scenario should be done before starting the motor after a shut down. In short, ran the motor and then shut it down about the same amount of time it takes you to pick up a skier that fell off (as you mentioned). Spray the carbs with the mix fuel, if the motor starts readily, then you can tell it is a fuel starvation related problem. If not, then the problem could be too much fuel or electrical. I understand the clear fuel filter stays full which means the fuel starvation or too much fuel is caused by the carbs.
Diagnosing too much fuel is hard but the simplest way is to remove one of the spark plugs and see how much misting comes out of the plug hole while cranking over the motor (when it would not re-start readily). Heavy misting indicates too much fuel entering the cylinder. And this is usually caused by misalinged carb throttles. As for electrical, start with the plugs make sure they are not wet and fouled. If they are dripping wet when you remove them after a shut down and the motor will not re-start readily, then that is yet another evidence of too much fuel entering the cylinder.
Note, carb throttles are the so called butterflies at the very back of the carb AND NOT THE ONE ON THE FRONT WHICH ARE THE CHOKE BUTTERFLIES.
Diagnosing too much fuel is hard but the simplest way is to remove one of the spark plugs and see how much misting comes out of the plug hole while cranking over the motor (when it would not re-start readily). Heavy misting indicates too much fuel entering the cylinder. And this is usually caused by misalinged carb throttles. As for electrical, start with the plugs make sure they are not wet and fouled. If they are dripping wet when you remove them after a shut down and the motor will not re-start readily, then that is yet another evidence of too much fuel entering the cylinder.
Note, carb throttles are the so called butterflies at the very back of the carb AND NOT THE ONE ON THE FRONT WHICH ARE THE CHOKE BUTTERFLIES.
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