Have you checked the plugs?
What YouTube mods did you perform on the carb?
Which distributor do you currently have? If an older points type, maybe it is time for an upgrade. Don't just replace parts for the sake of replacing parts. You should decide if you are going to replace your distributor before you replace cap, rotor, or wires for compatibility.
Start with the stuff that doesn't cost anything, then cheapest, and work towards most expensive.
Take appropriate steps to ensure your plugs are new or are in good condition and gapped properly.
Inspect all of your plug wires for damage and resistance. Replace if necessary.
Inspect your cap and rotor and replace if necessary.
There are a lot of videos on YouTube that can show you how to test your coil and enter ignition system.
Reliability comes from ensuring your components are in good working order before you get on the water.
