Originally Posted by 
ZUL8TR
				
			 
			Strange rat engine combination on that engine with a non standard Phelon mag. The 25ss engines originally came with CD ignition that IMO was far more reliable and accurate than points. Appears somebody adopted an early (probably 1970  -72) Merc 200 powerhead (padded cylinders?) on a 25ss tower and gear case. Does that engine have the correct fixed jet KC16A carb? The first Merc 25ss with CD came out in 1973 (that's when I bought mine for APBA racing) and the last 25ss built were in the mid 80's when the 25xs came out with the looped charged engine that was much faster than the 25ss and made them obsolete for racing the stock outboard class.