RPM for a Johnson 65 hp motor

[Trains1938]

Hi, I have a 1973 Johnson 65 hp OB motor I got when I bought my used boat. When I had it out on the lake it sounds like it does not reach it's max RPM. Since I don't know what the max rpm should be at W.O.T could somebody tell me? I think it is around 5000 rpm but I am not sure. Thanks for any help you can give me on this issue.

 

[ezmobee]

5000-5500 should be about right for WOT.

 

[Trains1938]

Hi ezmobee, Thanks for the come back. I will make a note of that.

 

[racerone]

When a motor will not run properly the first thing to do is a " no money spent " compressopn test.

 

[Sea Rider]

When it sounds like it does not reach it's max RPM it's tached with ear or tach gauge ?

Happy Boating

 

[jimmbo]

The engine was rated at 5000. WOT range was 4500 - 5500. Best overall performance will be obtained by propping for the 5300 - 5500 range