Yamaha GYTR YZF-R1 Manual page 51

Recommended oil level
After engine warm-up (water temperature of
75 to 80 degrees), while using the racing (rear)
stand, and check that the oil level is within a
range of the upper limit of the oil pan window
(right side of the vehicle) to the lower limit of
the engine crank case oil window (left side of
vehicle).
If it is out of range, adjust the oil level.
<Oil pan window (right side of vehicle)>
<Engine crank case oil window (left side of vehicle)>
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