What's the proper compression for my motor

[thunnus69]

Just ran a compression test on the Evinrude 3.3 HP 1947-51 outboard I inherited. Both cylinders read 80#psi. Is this a good range? Would like to know before I continue on.
Thanks,
Joe

 

[tashasdaddy]

Re: What's the proper compression for my motor

sounds decent to me. i would continue.

 

[freddyray21]

Re: What's the proper compression for my motor

that will run fine at that compression. Does it have a fuel valve that you use a screwdriver to open or does it have a knob. I am told 49 and older had the screw driver valve 50 and newer had a knob.

 

[thunnus69]

Re: What's the proper compression for my motor

Thanks for the replies. Freddyray I'm not sure about the fuel valve. Haven't gotten that far yet. I am in the process of building two stands for the outbaords I plan to disect and hopefully get running. I ran out of screws for the stands and decided to tinker with one of the motors. I started with the easiest.
Take Care,
Joe

 

[wbeaton]

Re: What's the proper compression for my motor

His motor is a 1948. The fuel shut off is (probably) a screw located at the rear of the motor accessed from underneth. 80 psi is fine.

The operator's manual should be in your email inbox.

 

[hawkerjv]

Re: What's the proper compression for my motor

Hi,
My 3.3 HP has about the same compression. I found a parts listing of the motor that someone posted on http://www.aomci.org/ in the ask a member section. Someone on this site may be able to help also. My primer is shot (parts n/a) and I am trying to retrofit a primer from another small engine. Interesting carburation.
Jim in Dodgeville

 

[thunnus69]

Re: What's the proper compression for my motor

Thanks again for all the replies. Thanks Jim for hooking me up with the Antique Outboard Club.
-Joe

 

[hawkerjv]

Re: What's the proper compression for my motor

BTW-AOMCI.org is currently having technical difficulties.
Jim in Dodgeville