Even local tech at a loss! My 1989 Mariner 115 hp, 4 cyl., 2 cycle doesn't like the water!
Started working on it 2 months ago. I replaced oil reservoir and the warning module. Replaced poppet valve and thermostat.
Compression: 120 all four cylinders. New battery. Spark only on #4. Replaced four spark plugs. Replaced rectifier. Stator tested ok on low speed, just a few volts off on high speed windings. Replaced one weak coil. Replaced pack, spark on all four. Cleaned all four carbs using 80# air. Inspected reed valves without disassembling. Inspected cylinders, all smooth, no scratches or burns. Rebuilt fuel pump. Replaced both fuel filters and fuel/water seperator. Replaced soft gas tubing clamps. Replaced primer ball. Installed new water pump kit. Had added oil to gas in tank, not sure if oil pump worked. Drained fuel tank, added sea foam and new gas. Timed carbs and timming per oem manual. adjusted carbs on water hose and it ran great. Took boat to lake and started it in water. Engine starts, sounds great from 750rpm up to 5000, but stops dead when popped into gear. Could only keep it running in gear using enrichment valve to rev engine then pop it in.
If I punched the enrichment valve, it would smooth out and rev up some, then go fall back. This is essentially the same problem I began having last summer before the pack failed. I believe it to be a problem in the fuel system, but can't identify it. The only things I didn't do, or check, on the fuel system is the two check valves at the crank case fed by the enrichment valve, which obviously work because the enrichment valve does feed them. I didn't clean the pulse hole behind the fuel pump when I rebuilt the pump, but the pump is obviously working. Even removed lower unit to make sure nothing had jamed. When I pop it into either gear, it's like someone jams a wedge into the gears. It stops that quick. This is my first post, so someone please help me out here. What else can I do? "The Mongose is Sea SICK!!"
Started working on it 2 months ago. I replaced oil reservoir and the warning module. Replaced poppet valve and thermostat.
Compression: 120 all four cylinders. New battery. Spark only on #4. Replaced four spark plugs. Replaced rectifier. Stator tested ok on low speed, just a few volts off on high speed windings. Replaced one weak coil. Replaced pack, spark on all four. Cleaned all four carbs using 80# air. Inspected reed valves without disassembling. Inspected cylinders, all smooth, no scratches or burns. Rebuilt fuel pump. Replaced both fuel filters and fuel/water seperator. Replaced soft gas tubing clamps. Replaced primer ball. Installed new water pump kit. Had added oil to gas in tank, not sure if oil pump worked. Drained fuel tank, added sea foam and new gas. Timed carbs and timming per oem manual. adjusted carbs on water hose and it ran great. Took boat to lake and started it in water. Engine starts, sounds great from 750rpm up to 5000, but stops dead when popped into gear. Could only keep it running in gear using enrichment valve to rev engine then pop it in.
If I punched the enrichment valve, it would smooth out and rev up some, then go fall back. This is essentially the same problem I began having last summer before the pack failed. I believe it to be a problem in the fuel system, but can't identify it. The only things I didn't do, or check, on the fuel system is the two check valves at the crank case fed by the enrichment valve, which obviously work because the enrichment valve does feed them. I didn't clean the pulse hole behind the fuel pump when I rebuilt the pump, but the pump is obviously working. Even removed lower unit to make sure nothing had jamed. When I pop it into either gear, it's like someone jams a wedge into the gears. It stops that quick. This is my first post, so someone please help me out here. What else can I do? "The Mongose is Sea SICK!!"