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Hello my name is ***** ***** am I speaking with? I read what you wrote but do not see any kind of model information. What are you working on exactly?
A 2004 Honda 150 is a fuel injected engine, not a carbureted engine. You wrote that you suspect the main jets are clogged. This obviously can not be a carburetor jet issue if the engine is EFI. Are you positive on your model year?
Got it. Being and EFI engine 90% of the time it needs to be hooked up to a scan tool in order to see if there are any sensor issues. That being said. What is the history on this engine? When was the last time it ran correctly? How often does it get run? Any idea on the engine hours? How old is the fuel itself, is it all new starting from a pumped dry tank, a mix of new and old, or something else? Have you done any troubleshooting on your own yet?
If it was last run in October there is a 50/50 chance the gas has spoiled to the point that the outboard will not tolerate it. (outboard engines are extremely picky on fuel quality). Steps 1 and 2 are to first get a portable fuel tank, fill that up with brand new gas, and hook that up to the engine and then 2nd, change all of the fuel filters. I know that sounds basic but that is exactly where we start in the shop. Is that something you can do or?
Are you reving the engine up in neutral or is the boat in the water and in gear trying to run it under a load?