Oil/gas mixture

hey i just got a 71 or 72 ts 250 today and it doesnt have a oil injector on it i was wondering what the correct oil gas mixture would be would it be 20:1 or 30:1? any comments would be great thank you-daniel
 
As I recall the TS 250 had a Posi-Force lubrication system to mix the fuel and oil, and a small (2.2 pint?) oil tank on the right hand side under the plastic cover. Is your missing these items?
 
is there any way i can just run a line to the hole that goes to the berring or do i have to have the whole system......i dont trust the oil pumps and i like to pre mix the gas and oil .....thanks -daniel
 
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