Yamaha WR250F 2022 Owner's Service Manual page 56

Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve seat contact width limit (intake)
Valve seat contact width limit (exhaust)
Valve stem diameter limit (intake)
Valve stem diameter limit (exhaust)
Valve guide inside diameter (intake)
Valve guide inside diameter (exhaust)
Valve-stem-to-valve-guide clearance limit
(intake)
Valve-stem-to-valve-guide clearance limit
(exhaust)
Valve stem runout
Valve spring
Free length limit (intake)
Free length limit (exhaust)
Cylinder
Bore
Wear limit
Piston
Piston-to-cylinder clearance
Diameter
Measuring point (from piston skirt bottom)
Piston pin bore inside diameter limit
Piston pin outside diameter limit
Piston-pin-to-piston-pin-bore clearance
Piston ring
Top ring
End gap limit
Ring side clearance
Side clearance limit
Crankshaft
Crank assembly width
Runout limit
Clutch
Clutch type
Clutch lever free play
Friction plate 1 thickness
Wear limit
Plate quantity
Friction plate 2 thickness
Wear limit
Plate quantity
Clutch plate thickness
Plate quantity
Warpage limit
ENGINE SPECIFICATIONS
0.12–0.19 mm (0.0047–0.0075 in)
0.17–0.24 mm (0.0067–0.0094 in)
1.6 mm (0.06 in)
1.6 mm (0.06 in)
4.945 mm (0.1947 in)
4.430 mm (0.1744 in)
5.000–5.012 mm (0.1969–0.1973 in)
4.500–4.512 mm (0.1772–0.1776 in)
0.080 mm (0.0032 in)
0.100 mm (0.0039 in)
0.020 mm (0.0008 in)
34.94 mm (1.38 in)
33.82 mm (1.33 in)
77.000–77.010 mm (3.0315–3.0319 in)
77.060 mm (3.0339 in)
0.030–0.055 mm (0.0012–0.0022 in)
76.955–76.970 mm (3.0297–3.0303 in)
4.0 mm (0.16 in)
16.043 mm (0.6316 in)
15.971 mm (0.6288 in)
0.002–0.022 mm (0.0001–0.0009 in)
0.50 mm (0.0197 in)
0.030–0.065 mm (0.0012–0.0026 in)
0.115 mm (0.0045 in)
55.93–56.00 mm (2.202–2.205 in)
0.030 mm (0.0012 in)
Wet, multiple-disc
7.0–12.0 mm (0.28–0.47 in)
2.70–2.90 mm (0.106–0.114 in)
2.60 mm (0.102 in)
2 pcs
2.72–2.88 mm (0.107–0.113 in)
2.62 mm (0.103 in)
6 pcs
1.50–1.70 mm (0.059–0.067 in)
7 pcs
0.10 mm (0.004 in)
2-3