what is the pre mix for a 1974 yamaha dt enduro?

[felix]

what is the fuel to oil ratio?

 

[Rango]

Those bikes had oil injection, but if the pump is plugged or bypassed then 50:1, use the best oil you can buy.

 

[Dimo J]

I had a 1974 DT175, ran it for over dozen years. You do not pre mix gasoline.

 

[guardrailjim]

If the oil pump has been removed, 32:1