Yamaha YBR125ED 2005 Service Manual page 21

Item
Valve stem runout
Valve seat width (cylinder head side)
Intake
Exhaust
Valve springs
Free length
Intake
Exhaust
Installed length (valve closed)
Intake
Exhaust
Spring rate
Intake (K1)
Exhaust (K1)
Intake (K2)
Exhaust (K2)
Compressed spring force (installed)
Intake
Exhaust
Spring tilt
Intake
Exhaust
Winding direction (top view)
Intake
Exhaust
ENGINE SPECIFICATIONS
Standard
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0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
0.90 ~ 1.10 mm (0.0354 ~ 0.0433 in)
47.06 mm (1.85 in)
47.06 mm (1.85 in)
25.6 mm (1.01 in)
25.6 mm (1.01 in)
8.01 N/mm (0.82 kg/mm, 45.74 ft · lb)
8.01 N/mm (0.82 kg/mm, 45.74 ft · lb)
9.33 N/mm (0.95 kg/mm, 53.27 ft · lb)
9.33 N/mm (0.95 kg/mm, 53.27 ft · lb)
160.0 ~ 184.0 N
(16.32 ~ 18.76 kg, 35.97 ~ 41.36 lb)
160.0 ~ 184.0 N
(16.32 ~ 18.76 kg, 35.97 ~ 41.36 lb)
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Clockwise
Clockwise
2 - 5
SPEC
Limit
0.010 mm
(0.0004 in)
1.6 mm
(0.06 in)
1.6 mm
(0.06 in)
44.71 mm
(1.76 in)
44.71 mm
(1.76 in)
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2.5°/2.1 mm
(2.5°/0.08 in)
2.5°/2.1 mm
(2.5°/0.08 in)
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