Whats the fuel-oil mix ratio on a 1999 Honda CR125?

You want around 125 ml of oil to one imperial gallon of fuel. 4 ounces to one gallon gives you 32:1 most people run that but for more power but also more wear you can run less oil say 3.2 gives you 40:1 and i think 2.5 ounces gives you 50:1 but as long as you run good oil you should be fine (hp2 oil is pretty good )