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Maybe start your own thread and not hi jack a 6 yr old one.

How are you testing spark? It should jump a 7/16 air gap easily. Get the manual and start testing. The parts cannon gets expensive. I would guess your problem is in the switch box.

That is absolutely a diaphragm pump. Clearly shows them in the pic 5 and 2. If it gets its pulse from block pull that hose off and see if it's full of fuel. It should not be

Don't know

You also need to check the fuel pump diaphragm.

I would start looking for a spare.

You will need an adaptor. I believe the 94 is a red plug and your 97 has automotive style plugs. CDI makes the adaptor.

According to who?

They are part of the carb. This is what they look like and you should buy a carb kit and rebuild/clean the carb. Buy a good kit...

Chances of finding a prop for that motor is going to be some slim. Treat that one like gold replacements will be hard to find.

What is your compression? Spark jump a 1/2" gap? Carb kit is 1395-9761 1 manual should be available call a dealer.

A leaking accelerator pump can

No it doesnt. There are accelerator pumps on the bottom 2 carbs that can leak.

Definitely the 3 cylinder.

You have a fuel issue. There should be no fuel in the bottom 2 cylinders for starting. The was a service bulletin for those motors. So the ones you gap should work fine. A spark plug should not cause hole shot issues.

Did you soak the carb? Spark on both cylinders? Compression is fine at 90 psi

How are you getting that info? Could be as simple as a slight calibration difference

That is wrong. Both those props have a rubber hub.

One question did you replace the pulse limiter with a new one? A bad pulse limiter will shorten the life significantly.

I trust Master tech. Last time I checked they were out of stock. Good to know they have some.