I was wondering if another starter motor from a different year will fit onto my 1973 Mercury (200) 20hp . The serial no: I have for this motor is 8003457A.
Seloc Manual under Cranking motor. There are two motors used, the larger motor is used on 35 & 40hp motors and " The smaller motor is used on all other units when a cranking motor is installed"
If youve got or can get hold of a Seloc manual it tells you how to test, dismantle & repair the starter motors. Are you sure it needs replacing.
As long as its the smaller type and not off a 30-40hp according to the Seloc book they should fit. The part number is 50 47216 later changed to 5097949AJ.
Take visit to USBoat Supply theyve got the mechanical, electrical diagrams and part numbers, you may the site usefull.