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Discussion Starter #1
i recently bought a 3.5 mariner OB.. what is a good gas oil mix ratio for this motor??? also there is a pick up tube behind the prop is this for cooling or just to muffle the exhaust???? :shrug:
 

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Discussion Starter #2
ttt
 

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Fishstik,

I used to have a 3hp gamefisher, I don't remember the ratio for oil...maybe..100/1. But I do remember that if I mixed it too rich it would foul out the plugs, everytime.

The tube on the back should be your exhaust. It goes below the water line just to muffle it. There was 2 holes drilled halfway down the exhaust tube(1/8 inch holes), and I was told that was to eliminate some of the backpressure.
 

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Discussion Starter #4
thanks andy, i have the same exhaust set up and i thought thats what it was for
 
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