1975 25HP evinrude Wont run at full throttle

[Michael77]

I have a 1975 25hp Evinrude. It runs really smooth and starts right up but there is one problem, at full throttle after a couple of seconds the engine sounds like its revving really high almost as if its in neutral but its not jumping out of forward gear. I just put in a brand new clutch dog and forward and reverse gear. It runs fine at about 85% throttle but once i go for full throttle it seems to rev high and then i have to back off the throttle. Any suggestions anyone?

 

[14ftgrumman]

Re: 1975 25HP evinrude Wont run at full throttle

If the motor rev's and you don't go, look for a spun prop.

Remove the prop, mark a line accross the back of it with a marker, put it back on. Go for a ride and check the lines when you get back. I'd almost bet that they won't line up.

 

[Daviet]

Re: 1975 25HP evinrude Wont run at full throttle

I agree, sounds like a spun prop hub to me also.

 

[Michael77]

Re: 1975 25HP evinrude Wont run at full throttle

Even though the prop is pretty much brand new? u Think its on wrong? Or is it something else?

 

[Michael77]

Re: 1975 25HP evinrude Wont run at full throttle

Even though the prop is pretty much brand new? u Think its on wrong? Or is it something else?