Answers: I hope when you say runs great surrounded by the parking lot you have a garden hose supplying dampen to the pump. So many associates run thier engines without river and burn the pump impeller. I would reccommend a complete sync and link on your engine. Your problem could be fuel system or timing....the engine is have problems under a loaded condition. You entail to check your carbs for gaskets that are sucking air.....do this by spraying a "little" starting fluid at the platform of the carbs around the gasket , if you notice a transmutation in the nouns of the engine.....those gaskets need to be replaced. If you don't mind a problem, you may need to hold your carbs dissassembled and cleaned. This will require that they be removed and that a proper sync and link be perform afterwards. If you are mechanically inclined you may know how to do this yourself with a service booklet and a good timing lighting. Setting the wide start timing may be your only problem because this desires to be done in the dampen with the boat running broad open or it can be done next to a test propeller. If your local provider will loan you a test prop you are better stale. More than likely they will not.
Recommend replace the spark plugs and fuel filter. God Bless
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