1960 evinrude 40hp motor running 1/3 power

[Dickinson]

Hey all, I need some help. I have a 1960 40hp evinrude and when i have it at full throttle it seems like it is only running about 1/3 speed or power. Any thoughts? Thanks for your help!

 

[samo_ott]

Re: 1960 evinrude 40hp motor running 1/3 power

Sounds like you're running on one cylinder. Do a spark test with a good tester. Or remove the plug wires one by one when it is running. If running on only 1 cylinder then 1 wire will do nothing and the other will kill the engine.

 

[R.Johnson]

Re: 1960 evinrude 40hp motor running 1/3 power

49 years old, do a compression test along with the spark.

 

[samo_ott]

Re: 1960 evinrude 40hp motor running 1/3 power

49 years young!

 

[Dickinson]

Re: 1960 evinrude 40hp motor running 1/3 power

good compression and motor's running on both cylinders.

 

[R.Johnson]

Re: 1960 evinrude 40hp motor running 1/3 power

Is the carb going to full open, and ignition plate going to full advance?

 

[dawsonbec]

Re: 1960 evinrude 40hp motor running 1/3 power

Im Having the same problem with my 1996 48 Johnson. So if u pull off one plug and nothing happens and then u put it back on and then pull the second plug and it dies that means its running on one cylinder?