Late 70's 20hp No power

Arkman

Chief Petty Officer
Joined
Oct 22, 2008
Messages
400
I have a 20hp short shaft that I seems to die when I go 3/4 to full throttle. I have been doing some research and decided maybe I should replace the fuel filter and clean up the carb. I dont even know where to start, I'm a handy person but I've never really worked on engines like this. Anyone have any advice? Is there a service manual I can get somewhere for this bad boy? Any other thoughts about why this would happen?

I found this motor in some of my dads stuff about 12 years after he died so I have no idea what was done with it before he died.

Thanks!
 
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