What is the maximum RPM for my 140 Johnson.

[77glasssv188]

Hello,

I have a 1977 140hp Johnson outboard model number 140TL77S. I am trying to find out the maximum rpm for the engine.

Thank you

[Rebel Sympathy]

You want it to turn at least 5000rpm with a normal load, and no more than 5500rpm. Of course, if it over revs you need a prop with more pitch and vice versa if it won't rev enough.

[77glasssv188]

Thank you,

Ill give it a shot and see what it revs to.