ENGINE SPECIFICATIONS
2-5
Limit
4.550 mm (0.1791 in)
Valve-stem-to-valve-guide clearance (intake)
0.010–0.037 mm (0.0004–0.0015 in)
Limit
0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance (exhaust)
0.025–0.052 mm (0.0010–0.0020 in)
Limit
0.100 mm (0.0039 in)
Valve stem runout
0.010 mm (0.0004 in)
Cylinder head valve seat width (intake)
0.90–1.10 mm (0.0354–0.0433 in)
Limit
1.6 mm (0.06 in)
Cylinder head valve seat width (exhaust)
0.90–1.10 mm (0.0354–0.0433 in)
Limit
1.6 mm (0.06 in)
Valve spring
Free length (intake)
41.71 mm (1.64 in)
Limit
39.62 mm (1.56 in)
Free length (exhaust)
41.71 mm (1.64 in)
Limit
39.62 mm (1.56 in)
Installed length (intake)
35.30 mm (1.39 in)
Installed length (exhaust)
35.30 mm (1.39 in)
Spring rate K1 (intake)
23.54 N/mm (134.41 lb/in) (2.40 kgf/mm)
Spring rate K2 (intake)
36.58 N/mm (208.87 lb/in) (3.73 kgf/mm)
Spring rate K1 (exhaust)
23.54 N/mm (134.41 lb/in) (2.40 kgf/mm)
Spring rate K2 (exhaust)
36.58 N/mm (208.87 lb/in) (3.73 kgf/mm)
Installed compression spring force (intake)
140–162 N (31.47–36.42 lbf) (14.28–16.52 kgf)
Installed compression spring force (exhaust)
140–162 N (31.47–36.42 lbf) (14.28–16.52 kgf)
Spring tilt (intake)
2.5°/1.8 mm
Spring tilt (exhaust)
2.5°/1.8 mm
Winding direction (intake)
Clockwise
Winding direction (exhaust)
Clockwise
Cylinder
Bore
52.000–52.010 mm (2.0472–2.0476 in)
Wear limit
52.110 mm (2.0516 in)
Taper limit
0.050 mm (0.0020 in)
Out of round limit
0.005 mm (0.0002 in)
Piston
Piston-to-cylinder clearance
0.015–0.048 mm (0.0006–0.0019 in)
Limit
0.15 mm (0.0059 in)
Diameter D
51.962–51.985 mm (2.0457–2.0466 in)
YamahaR125.COM
Summary of Contents for YZF-R125
Page 1: ...5D7 F8197 E0 YAMAHAR125 COM SERVICE MANUAL YZF R125 ...
Page 6: ...YamahaR125 COM ...
Page 8: ...YamahaR125 COM ...
Page 52: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 29 1 2 3 4 YamahaR125 COM ...
Page 70: ...CABLE ROUTING 2 47 YamahaR125 COM ...
Page 73: ...YamahaR125 COM ...
Page 102: ...ELECTRICAL SYSTEM 3 29 YamahaR125 COM ...
Page 105: ...YamahaR125 COM ...
Page 172: ...CHAIN DRIVE 4 67 YamahaR125 COM ...
Page 181: ...ENGINE REMOVAL 5 6 2 2 4 1 3 YamahaR125 COM ...
Page 263: ...THROTTLE BODY 7 8 YamahaR125 COM ...
Page 264: ...AIR INDUCTION SYSTEM 7 9 EAS27040 AIR INDUCTION SYSTEM 1 2 3 YamahaR125 COM ...
Page 268: ...AIR INDUCTION SYSTEM 7 13 YamahaR125 COM ...
Page 271: ...YamahaR125 COM ...
Page 283: ...CHARGING SYSTEM 8 12 1 AC magneto 3 Rectifier regulator 4 Main fuse 9 Battery YamahaR125 COM ...
Page 285: ...CHARGING SYSTEM 8 14 YamahaR125 COM ...
Page 295: ...SIGNALING SYSTEM 8 24 YamahaR125 COM ...
Page 299: ...COOLING SYSTEM 8 28 YamahaR125 COM ...
Page 323: ...FUEL INJECTION SYSTEM 8 52 YamahaR125 COM ...
Page 327: ...FUEL PUMP SYSTEM 8 56 YamahaR125 COM ...
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Page 354: ...YamahaR125 COM ...