Under seat the back black tank is for gas. The white tank in the front of the black tank is the 2 cycle oil.
In most cases you should not mix oil into the gas of your 1979 Yamaha 50 cc moped. This type of moped had its own oil reservoir. If it is not marked on the gas You do not need to oil with the gas.
The gas oil mixture for that sled is 24:1 according to the tag on my 79 srx.
No it does not mine just started I am by passing the oil injection pump because its broken but it started on just gas no oil
what is the oil gas mixture for a ysr50
I believe Yamaha came out with oil injection. You do not mix the oil with the gasoline - the oil is in its own reservoir and mixes automatically.
32:1 gas to oil mixture
3.7
2.0l
Yamaha's Yamalube, 2 stroke oil is a good choice.
30 liters of gas to 1 liter of oil
Crankcase oil, gas needs to be premixed
It should be oil injected with a separate oil resivoir.