Home › Forum › Ask A Member › Mercury 650 problems – is it worth an overhaul? › Re: Mercury 650 problems – is it worth an overhaul?
Well since your pulling the flywheel to do the transom, you might as well do anywiring under there while its off and either get a new harness or redue yours while the boats down. As far as the prop and over reving go, if you have the old prop still get the part number and cross it with a new prop number from say mercury or a nos vendor. If the prop was to big an you went to a smaller prop it would "seem" to be over reving because you had gotten used to hearing it bogged down. Honestly if the electronics and wiring are not on par trying to diagnose anything else is pointless. So many fuel and other "problems" have veen faulty electronics and wiring, and have ended more motors in the melter when wiring can be cheaper and faster than scratching my head rebuilding carbs and fuel pumps only find one bad wire, module, or switch that cost an 1/8th of rebuilding other components was killing performance and fun time. Just my two cents.