Just purchased a Gamefisher 15 hp from a little old lady.(REALLY) The motor is spotless. I pulled the plugs they looked new no visable wear on the motor whatsoever. So I plunked down $400 and took it home. First things first, Tried to pull the lower to replace the impeller. removed the four bolts and it only would pull down about an inch. Tapped on it with a rubber mallet and it would not budge. Also I removed 2 screws over the exhaust pulled the plastic cover off and found a corroded mini thermostat. the serial number is OE141896. Anyone know how to get this lower off and what year it is. I'm assuming it's a force. I know I violated the prime directive and bought a motor that wasn't running but gee wiz it sure does look nice.