Hi all, I've got a 1973 Merc 9.8 110 series. Last year I got it from a friend after 20 years of storage. Cleaned the carb, replaced gear oil, new plugs, the wires were all corroded so I replaced all wires in system with new wires, same gauge, brand new tank and fuel line, new impeller. Worked great all last summer.
Recently this summer the Merc was bogging down like crazy under load, at first it was sputtering, losing speed then picking back up again, at its worse it was really bogged down, no faster than walking pace. I took the carb out and cleaned all over again, every jet and hole. Back on the water and no difference. When I was trying it I primed the bulb a bit and it took off! Yesterday I replaced the fuel pump gaskets and took it on the water, it worked like new...for a while. At some point I slowed down and could never get back to speed, bogged down again. Any thoughts where to look next?
Recently this summer the Merc was bogging down like crazy under load, at first it was sputtering, losing speed then picking back up again, at its worse it was really bogged down, no faster than walking pace. I took the carb out and cleaned all over again, every jet and hole. Back on the water and no difference. When I was trying it I primed the bulb a bit and it took off! Yesterday I replaced the fuel pump gaskets and took it on the water, it worked like new...for a while. At some point I slowed down and could never get back to speed, bogged down again. Any thoughts where to look next?