Im thinking about purchasing a backup motor for my boat. Currently I have a 1967 Merc 650 (65hp 4cyl) that needs some tweaking. Found the same motor, only it is a 1966 model year. Not sure what the differences would be between them. I would appreciate all the comments/sugggestions/advice...thank you
Will the '67 match up with my existing wiring harness and controls???
1. fuel/oil mix (50:1 vs 40:1)
2. external wiring harness (will each motor hook up correctly on the same harness)