How much oil per liter for 501 2 stroke engine?

For a 501 2-stroke engine, the typical oil-to-fuel ratio is usually around 50:1. This means you would mix approximately 2.5% oil with your fuel, which translates to about 20 mL of oil per liter of fuel. However, it's always best to consult your engine's specific manual for the manufacturer's recommended oil ratio, as it can vary.