Yamaha YZ450F Owner's Service Manual page 49

Oil ring
Dimensions (B  T)
End gap (installed)
Crankshaft
Width A
Runout limit C
Big end side clearance D
C
Balancer
Balancer drive method
Clutch
Clutch type
Clutch release method
Clutch lever free play
Friction plate thickness
Wear limit
Plate quantity
Clutch plate thickness
Plate quantity
Warpage limit
Clutch spring free length
Minimum length
Spring quantity
Push rod bending limit
Transmission
Transmission type
Primary reduction system
Primary reduction ratio
Final drive
Secondary reduction ratio
Operation
Gear ratio
1st
2nd
3rd
4th
5th
B
T
C
D
A
ENGINE SPECIFICATIONS
1.50  2.55 mm (0.06  0.10 in)
0.20–0.50 mm (0.0079–0.0197 in)
61.95–62.00 mm (2.439–2.441 in)
0.030 mm (0.0012 in)
0.150–0.450 mm (0.0059–0.0177 in)
Gear
Wet, multiple-disc
Inner push, cam push
7.0–12.0 mm (0.28–0.47 in)
2.92–3.08 mm (0.115–0.121 in)
2.85 mm (0.112 in)
8 pcs
1.10–1.30 mm (0.043–0.051 in)
7 pcs
0.10 mm (0.0039 in)
48.00 mm (1.89 in)
47.00 mm (1.85 in)
6 pcs
0.10 mm (0.0039 in)
Constant mesh 5-speed
Spur gear
2.609 (60/23)
Chain
3.692 (48/13) (USA) (CAN) (AUS) (NZL) (ZAF)
3.769 (49/13) (EUR) (JPN)
Left foot operation
1.929 (27/14)
1.533 (23/15)
1.300 (26/20)
1.091 (24/22)
0.952 (20/21)
2-6