Fastwins get locked up all the time. Don’t know why the power heads do that. Maybe the carbon seal on the bottom of the crank has let go. Maybe the head gasket is leaking a bit. Maybe the exhaust cover is leaking, although I never really saw that one on an FD/Fastwin, even in salt water. IS yours in salt water? If so, it could be the water jackets are failing. Speculation. First, divide and conquer: Pull off the lower unit and make sure it’s not the LOWER unit that is binding….Then report back.
Long live American manufacturing!
