Yamaha BIG BEAR 4X4 Owner's Manual page 158

MODEL
Spark plug:
Type/manufacturer
Gap
Clutch type
Transmission:
Primary reduction system
Primary reduction ratio
Secondary reduction system
Secondary reduction ratio
Transmission type
Operation
Gear raito:
Reverse gear
Chassis:
Frame type
Caster angle
Trail
Tire:
Type
Size: Front
Size: Rear
DR8EA / NGK
0.6–0.7 mm (0.024–0.028 in)
Wet, centrifugal automatic
Spur gear
76/24 (3.166)
Shaft drive
28/24 × 24/18 × 33/09 (5.703)
Constant mesh 5-speed forward, 1-speed reverse
Left foot operation
1st 40/12 (3.333)
2nd 34/18 (1.888)
3rd 30/22 (1.363)
4th 25/26 (0.961)
5th 19/27 (0.703)
22/17 × 35/15 (3.019)
Steel tube
°
4
21 mm (0.83 in)
Tubeless
AT25 × 8-12
AT25 × 10-12
10-3
YFM400FW