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Hello my name is ***** ***** I will assist you. The problem here could be with the air compressor. Take off the top cover and see if the belt of the compressor is still ok. If the belt is ok then next thing to check is the air and fuel pressure but to do so you wuold require some special tools. If you think you can check then please advise so that i will help you further.
I do not think it is a prop problem as it should be able to plain the boat with a 24 pitch prop. So yes what you need to do is to connect a fuel pressure gauge to the fuel and air line. The air pressure should be between 78 - 82 psi and the fuel pressure should be between 88 and 92 psi. If those are ok then next thing you need to do is to perform a cylinder misfire test by means of a diagnostic tool. Here you would need to check the air and fuel injectors one by one and also the coils, as if one cylinder is not running properly the engine will loose its power.
Ok but still you need to follow that procedure as it seems that one of the cylinders is not functioning properly. Yes you can use an automotive pressure gauge. You would need to connect at the back of the engine where there are the bars of the air and fuel injectors, you have shnorr valves similar there.
Yes youy need to check it while running.
You can use a tyre pressure gauge or the one you used for fuel