Oil to fuel ratio for a yamaha DT50 1980?

Question:
hi there would really like to know this as i need to put petrol in! the oil pumps broken and need to mix oil in with the fuel but how much do i put in per 5 litres of fuel?

Answers:

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It's always best to run a bit oily on field bikes, helps the engine last longer. 30:1 is a safe mix to run on most old offroaders That is about 170ml of 2 stroke oil to 5L of petrol.

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Use a good grade of two stroke oil at 40:1 ---- 3.2 ounces of oil per gallon of premium fuel.

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Good quality oil, approx 3 oz, cheap oil around 6 oz.

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