Getting my 1975 Merc 115 hp ready for the water. I read many posts and see many ads for boat motors that almost always say"need carbs rebuilt". Is there a way I can try to avoid this as long as possible. Can / should I squirt some carb cleaner in carbs ever once in awhile? Additives to gas on regular basis? I've owned this boat for only a year so can't verify winterizing procedures of last owner. I think he did a good job considering the condition of the boat and motor. I did fog the carbs and cylinders as well as used Stable in a full tank of gas.