Well its been 3 months and it still needs a new prop shaft (source found thanks to this site)but after mag ,carb,fuel tank and impellor over haul a 16 to 1 tcp 3 oil mix she started right up with a belch of blue smoke.After some minor tweeking of needle valves she came up to full power.YEAH !!!Question..with needle valve bearings,why is 8 0z to gal the recommended ratio??Why wont this engine run at 25 to 1 like a Johnson or even 40 to 1 like most air cooled ,bronze bushed con rods garden equipment..kelly
This is a 1951 engine, not a newer 60's or 70's model. The 16:1 ratio was for the inferior oils they had at the time. With good oil you can thin it to 32:1 without problems (reduces the rainbow oil slick this leaves behind), but it's better to err on the side of more oil since parts are scarce on these old mercury Wizards.
ok..thanks for reply..I will run the gal of 16 to 1 than switch to 25 to 1..k