post the model number or year please. It's most likely 50:1, but you want to be sure....
Post the serial number. Older models had a two part serial number, the first part being the relevant model number The numbers should be on a plate on the transom bracket
Do you know the age.
Generally anything from 1964 onwards will run on 50:1. I think all 6 hp models are after that year. ( except for a couple from the 1920s)
6203 is the model number. It makes it a 1972 model
50:1 fuel mix then using a TCW3 2 stroke outboard engine oil
That's near enough 1 pint in 6 gallons
more precisely
2.56 fluid ounces per US Gallon
3.2 fluid ounces per UK (Imperial ) Gallon
20mls per litre anywhere in the world except the USA
2% if you are a mathematician