jpfieber
Well-known member
- Joined
- Jun 13, 2008
- Messages
- 46
- Reaction score
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- LOCATION
- Mequon, WI
Please forgive my ignorance, I'm pretty new at the boat motor thing. I have 2 motors for my 12 foot tin, a 1954 Mercury Mark 20, and a 1982 Mercury 7.5. From what I've found, I should be using 50:1 for the 1982, but I'm uncertain about the Mark 20. My mechanic said 32:1. I found a doc on the web that seemed to suggest Mercury motors of that size and time period were 20:1. Anyone know for sure? What would happen if I ran the wrong mixture through the motor? I'd love to simplify and have one tank that works for both, any ratio that would satisfy both?