1976 70 HP Evinrude won't go past 2000 RPM
by Dave Luther
I have a 1976 &) HP Evinrude that was stored for 7 years. It only has 470 hours on it, as the previous oner kept a complete log of all the fuel used.
I replaced the water pump impeller, thermostate, etc and it starts right up. It runs smooth up to 1800 RPM, but won't go higer unless I advance the throtle very slowly, then it goes up to 2000 RPM. If I advance the throtle more the engine slows down. It has 100 psi on all three cylinders.