Yamaha YZF-R125 Service Manual page 28

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Limit
Valve-stem-to-valve-guide clearance (intake)
Limit
Valve-stem-to-valve-guide clearance (exhaust)
Limit
Valve stem runout
Cylinder head valve seat width (intake)
Limit
Cylinder head valve seat width (exhaust)
Limit
Valve spring
Free length (intake)
Limit
Free length (exhaust)
Limit
Installed length (intake)
Installed length (exhaust)
Spring rate K1 (intake)
Spring rate K2 (intake)
Spring rate K1 (exhaust)
Spring rate K2 (exhaust)
Installed compression spring force (intake)
Installed compression spring force (exhaust)
Spring tilt (intake)
Spring tilt (exhaust)
Winding direction (intake)
Winding direction (exhaust)
Cylinder
Bore
Wear limit
Taper limit
Out of round limit
Piston
Piston-to-cylinder clearance
Limit
Diameter D
ENGINE SPECIFICATIONS
4.550 mm (0.1791 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.080 mm (0.0032 in)
0.025–0.052 mm (0.0010–0.0020 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.6 mm (0.06 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.6 mm (0.06 in)
41.71 mm (1.64 in)
39.62 mm (1.56 in)
41.71 mm (1.64 in)
39.62 mm (1.56 in)
35.30 mm (1.39 in)
35.30 mm (1.39 in)
23.54 N/mm (134.41 lb/in) (2.40 kgf/mm)
36.58 N/mm (208.87 lb/in) (3.73 kgf/mm)
23.54 N/mm (134.41 lb/in) (2.40 kgf/mm)
36.58 N/mm (208.87 lb/in) (3.73 kgf/mm)
140–162 N (31.47–36.42 lbf) (14.28–16.52 kgf)
140–162 N (31.47–36.42 lbf) (14.28–16.52 kgf)
2.5°/1.8 mm
2.5°/1.8 mm
Clockwise
Clockwise
52.000–52.010 mm (2.0472–2.0476 in)
52.110 mm (2.0516 in)
0.050 mm (0.0020 in)
0.005 mm (0.0002 in)
0.015–0.048 mm (0.0006–0.0019 in)
0.15 mm (0.0059 in)
51.962–51.985 mm (2.0457–2.0466 in)
2-5