Originally Posted By: jdhunter2011
Not sure about the 4 strokes never owned one but I would think the 60hp would be about like mine. If I ever have any engine work done, the 50hp has the same block as the 75 opti its just carburated different. Essentially Ive been told you can re-card a 50 to make a 75
a 50hp is a carb motor, a 75 opti is a direct injected motor. you could 75 hp carbs on a 50, but you couldn't make it rich enough to run right. It'll eventually sling apart. Plus the port timing is different because their two different blocks.