1991 50 hp force only runs 10 min

[murph88]

I bought a 1991 force 50 hp , I put it on boat, run it in water for 10 or 15 mins , plenty of water shooting out exhaust. Took boat to lake , ran it fast for about 5 mins, backed it down, ran it fast again ,backed it down ,shifted into neutral, tryed to shift into forward and it died. tryed starting and shifting a few more times , wont stay running. tryed turning up idle but it didnt want to stay running and pretty soon wouldnt start at all (used trolling motor to get to shore)

Took boat home checked thermostat, seemed messed up, left it out. Put motor back in barrel , fired it up ( had to adjust idle back down) ran motor jn barrel over half an hour shifting in and out of gear, no problem.

Took boat back to lake and the same thing, goes for about 10 min then doesnt want to run HELP

 

[roscoe]

Re: 1991 50 hp force only runs 10 min

Initial guess is that after running it hard, one of the coils starting to fail, and stops providing spark after the coil gets hot.

Try it again, then check for spark on both cylinders.

 

[murph88]

Re: 1991 50 hp force only runs 10 min

thanks Ill try that , and let you know how it goes