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Few more HP's out of a 35?

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I have a 1985 Evinrude 35...It has been a great engine and is still running strong...Is there anything I can do or modify to the engine to pick up a few more ponies???
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Is it the 20 cu twin or a 3 cyl.? You can always polish out the ports a little and relieve back pressure by drilling a few larger holes in the exhaust housing, but that engine has been everything from an 18 to a 35 HP and it is near the limit because of displacement.

Frank_S
 

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Discussion Starter · #4 ·
I am guessing it is a 20 cu in twin. I defiantly know it is not a 3 cyl. I havent ever heard of anybody doing anything to really hype up smaller motors and figured I would ask. It would defiantly be cool to pick up some hp's though. I need to find out what the right prop is for the boat. I got one that seems to do fine until the boat is slam loaded and got one that does great loaded, but runs to high of rpms when its light.
 
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