Yamaha YZF-R1 Kit Manual page 48

Recommended oil level
After engine warm-up (water temperature
of 75 to 80 degrees), while using the racing
(rear) stand, check whether the oil level is
in the range of the upper limit of the oil pan
upper window (at the right side of vehicle)
and the lower limit of the engine crank case
oil window (at the 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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