Yamaha YZ250F(E) Owner's Service Manual page 49

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
Limit
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
Shifting mechanism
Shift mechanism type
Shift fork guide bar bending limit
Shift fork thickness
Decompression device
Device type
C
D
A
ENGINE SPECIFICATIONS
55.95–56.00 mm (2.203–2.205 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)
2.90–3.10 mm (0.114–0.122 in)
2.80 mm (0.110 in)
9 pcs
1.10–1.30 mm (0.043–0.051 in)
8 pcs
0.10 mm (0.0039 in)
45.00 mm (1.77 in)
44.00 mm (1.73 in)
5 pcs
0.10 mm (0.0039 in)
Constant mesh 5-speed
Spur gear
3.353 (57/17)
Chain
3.846 (50/13)
Left foot operation
2.143 (30/14)
1.750 (28/16)
1.444 (26/18)
1.222 (22/18)
1.042 (25/24)
Shift drum and guide bar
0.050 mm (0.0020 in)
4.85 mm (0.1909 in)
Auto decomp
2-6