Compression for 72 9.5hp johnson

trita306

Seaman Apprentice
Joined
Jan 16, 2014
Messages
32
What should the compression be around for a 72 johnson? I know they run a little lower than expected but I am curious what is acceptable.
 

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: Compression for 72 9.5hp johnson

As you know, they are low compression motors. You wont be getting any 100 psi plus readings. Depends on your gauge, but 70 to 95 or so? They should be even.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: Compression for 72 9.5hp johnson

Have you checked yours yet and what is it ??
 

ultra353

Petty Officer 1st Class
Joined
Jun 21, 2009
Messages
387
Re: Compression for 72 9.5hp johnson

On every 9.5 that I've had 60-75lbs is all I ever saw. The all ran well.
 

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: Compression for 72 9.5hp johnson

It should run on that but do a good de-carb on it once you get it running.
 
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