I recently purchased a boat, motor and trailer. It is a 1970 S' sail wind, 14ft, fiberglass with a 28 Hp Johnson. The numbers on the motor are RXE-10C and serial # is 345432. Looked online and cant find the model number anywhere. I have no information about this motor at all. Here's the thing -- It starts and runs OK, but needs to have the choke about 90% on to keep running, and will stall if you throttle back to far. (carb kit)? Had it out today and it seems to putt around but is pretty slow. I understand that this boat is not a rocket, but was expecting more. What can you expect for $350. Any help is appreciated.