bubba7
02-17-2017, 08:17 PM
I bought a boat, a 1989 Ski Supreme. It has a Mitsu g54 in it. However, exactly what g54 has been a problem. I can't find a normal number on it.
It was certified by Ski Supreme, the boat builder, and Pleasure-craft, the engine marinizer, as having 140 HP. It does this with a 2 barrel Rochester marine carb and point distributor. It has an oil pan that only matches the Starion oil pan, at least as far as autos go. It has a starter that only matches the Starion starter (9 tooth), at least as far as autos go (I found matches to the starter on Onan generators, Ford tractors, and several Japanese built fork lifts). Today I took the valve cover off, and see that the engine has no Jet valves in the head.
This motor is a marvel. The boat had been partially submerged several times in the past 5 years to the point that at one time the oil filter rusted through. When I got it, the oil pan was rusted through, the starter looked like it was filled with Georgia red mud, and the fuel pump had something that looked like Martian soil in it. The sea water pump was rusted solid, and the carburator was rusted and corroded with major calcium deposits. When I dropped the oil pan there was no rust or water damage anywhere. After fixing all this (which cost only $25 for an electric fuel pump, everything else was fixed with PB Blaster, WD 40, and lemon juice to boil the carb), the engine fired immediately, first crank. The boat screams, 40+ mph without breaking a sweat.
I love this engine. I want a couple more. I wish I knew exactly what it is. Anybody have any ideas?
It was certified by Ski Supreme, the boat builder, and Pleasure-craft, the engine marinizer, as having 140 HP. It does this with a 2 barrel Rochester marine carb and point distributor. It has an oil pan that only matches the Starion oil pan, at least as far as autos go. It has a starter that only matches the Starion starter (9 tooth), at least as far as autos go (I found matches to the starter on Onan generators, Ford tractors, and several Japanese built fork lifts). Today I took the valve cover off, and see that the engine has no Jet valves in the head.
This motor is a marvel. The boat had been partially submerged several times in the past 5 years to the point that at one time the oil filter rusted through. When I got it, the oil pan was rusted through, the starter looked like it was filled with Georgia red mud, and the fuel pump had something that looked like Martian soil in it. The sea water pump was rusted solid, and the carburator was rusted and corroded with major calcium deposits. When I dropped the oil pan there was no rust or water damage anywhere. After fixing all this (which cost only $25 for an electric fuel pump, everything else was fixed with PB Blaster, WD 40, and lemon juice to boil the carb), the engine fired immediately, first crank. The boat screams, 40+ mph without breaking a sweat.
I love this engine. I want a couple more. I wish I knew exactly what it is. Anybody have any ideas?