I have a 1992 60hp 2-cyl. Nissan. While running at near full throttle (4000 rpm)the engine acted as if I had reduced power (bogged down). I would then only run @ approx. 1500 to 1800 rpm under load. In Neutral it would rev-up as if nothing were wrong. So we limped back to the dock. I have since replaced the hose and pressure bulb, replaced balance hose between carbs, dismantled and cleaned both carbs, checked all the hose clamps and gaskets on filter and carbs and checked and cleaned the plugs. At the house and while getting all the neighbors attention, with the water hose attached the engine runs great (No Load) I have ran the engine up and down over approx. 1hr with no problems while adjusting the carbs and trying to duplicate the problem with no success. Yesterday I put the boat in the water and it ran fine for about 3/4 of a mile and it bogged again with all the same results. I tried squeezing the pressure bulb while underway with a load on the engine and all it managed to do is flood the eng 
ine. I do not believe that it is overheating and did not feel as if it ever got to hot. And the overtemp beeper/horn has never gone off. The tattle tail for the water pump has never stopped. The water pump has never been changed (probably needs it, just because) Tried all I know....If you got any suggestions it sure would help.
ine. I do not believe that it is overheating and did not feel as if it ever got to hot. And the overtemp beeper/horn has never gone off. The tattle tail for the water pump has never stopped. The water pump has never been changed (probably needs it, just because) Tried all I know....If you got any suggestions it sure would help.
