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    Overboard stream modification-60hpRude&John

    Does anyone have a copy of modification buletin for 50, 60, & 70HP Johnson and Evinrude from 1985 and newer. I know overboard stream needs to be moved from lower part of exhaust chamber to top to eliminate air pocket which causes two top cylinders to overheat causing engine damage. Seems not all...
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    Johnson Horsepower Question (50,60,70)

    I have a technical question on 1985 and newer 3 cylinder Johnson and Evinrude- 50HP, 60HP, 70HP. All three horsepowers use the same pistons, rings, rods, cranks, and reed valves. How do they get a 20HP difference with the same parts. Is it carbs, carb jets, port timing, or a combination of...
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