If your asking about pre-mix oil that you mix with the gasoline, they recommend Yamalube "R" (Yamalube racing 2-cycle oil) Mixing ratio : 30:1 or Castrol A747
For the transmission and gearbox, Yamalube 4 (10W-30) or SAE 10W-30 type SE motor oil.
Anything that is high performance 2 stroke oil that's what i use and it works great.
The YZ250 only needs about three quarters of a liter of oil. This equates to about .79 quarts, or a little over 3 cups.
625ml
32:1
Any premium 2 cycle oil.
transmission oil capacity is 0.75 liters
24:1 or 32:1 the richer the longer the life i like 24:1 for my 1993 yz250
No a yz 250 2 stroke does not but a YZ250F does.
750cc's on a ratio cup.
If its a 2-stroke I believe its 750ml
750 Ml or 0,75 Liters
I belive that the forks on a 250f are the same so that would make it 100mm for a person who would weigh inbetween 160-190lbs.