The oil to gas ratio for an old Mercury 7.5 HP outboard is 50:1.
50:1 GAS/OIL MIXTURE
Gas (US Gals)| Oil (Ounces) | Oil (Pints) | Gas (Liters)| Oil (Liters)
0.37...............| 0.95.............| 0.06.........| 1.40...........| 0.03
0.5.................| 1.28.............| 0.08.........| 1.90...........| 0.04
0.66...............| 1.69.............| 0.11.........| 2.50...........| 0.05
1.0.................| 2.56.............| 0.16.........| 3.79...........| 0.08
2.0.................| 5.12.............| 0.32.........| 7.58...........| 0.15
3.0.................| 7.68.............| 0.48.........| 11.37.........| 0.23
4.0.................| 10.24...........| 0.64.........| 15.16.........| 0.30
5.0.................| 12.80...........| 0.80.........| 18.94.........| 0.38
6.0.................| 15.36...........| 0.96.........| 22.73.........| 0.46
10.0...............| 25.60...........| 1.60.........| 37.89.........| 0.76
15.0...............| 38.40...........| 2.40.........| 56.83.........| 1.14
20.0...............| 51.20...........| 3.20.........| 75.78.........| 1.52
Hope This Helps.
A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
2%
The 18 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 5.0 hp Mercury outboard, requires a 50:1 ratio, this works out to roughly one pint of 2 cycle oil, to six gallons of fuel.
2.5Oz per gallon of gas
If manufactured after 1965, an 80 hp Mercury outboard requires a 50:1 fuel, to 2 cycle oil ratio.
My 2003 3.3hp outboard motor is 50:1 mixture.
50:1 Oil to gas ratio
it's 50:1
mix 50:1
50:1
A 25 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.