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Hi Charles, my name is Jason.
Has engine compression and spark output been checked yet? What is the serial number on the engine? What is the history on this engine, have you ever personally seen it make full power under a load?
Hi Charles. The engine needs to be compression tested first. After that the spark needs to be checked under a load. The easiest way to do this is to run the engine with the cover off. Hook up a timing light to each plug wire, and see if the light shows a flash with the boat going as fast as it will go. Is this something you can do?
Sounds like you don't have the tools required to do basic troubleshooting. Fixing this engine is not something we are going to be able to accomplish together. Aside from those injectors, which need to go into a flow tester to see if they are flowing the correct amount of CC's per minute, did you have any questions for me?
Okay good luck