RPM for a Johnson 65 hp motor

Trains1938

Petty Officer 3rd Class
Joined
Jun 30, 2015
Messages
75
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.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
36,045
When a motor will not run properly the first thing to do is a " no money spent " compressopn test.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
When it sounds like it does not reach it's max RPM it's tached with ear or tach gauge ?

Happy Boating
 

jimmbo

Supreme Mariner
Joined
May 24, 2004
Messages
12,944
The engine was rated at 5000. WOT range was 4500 - 5500. Best overall performance will be obtained by propping for the 5300 - 5500 range
 
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