Yamaha YFM45FAR Service Manual page 16

GEN
FEATURES
INFO
4WD
When the 4WD mode is selected, the gear motor is operated, and the drive clutch 2 moves to the
right and engages with the left differential side gear 3. Accordingly, power is transmitted as follows:
ring gear 5 → differential pinion gear 4 → left differential side gear 3 → drive clutch 2 → adapter
1 → left front constant velocity joint.
Meanwhile, power from the differential pinion gear 4 is transmitted to the right front constant
velocity joint via the right differential side gear 6.
The ring gear 5 and the drive clutch 2 are not engaged at this time. Therefore, the rotational
difference that occurs between the right and left wheels, while the handlebar is being turned, is
absorbed by the difference in the rotational speeds of the ring gear 5 and the left differential side
gear 3.
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