Yamaha XT660R Service Manual page 32

Item
Valve-stem-to-valve-guide clearance
Intake
Exhaust
Valve stem runout
Valve seat width
Intake
Exhaust
Valve springs
Free length
Intake
Exhaust
Installed length (valve closed)
Intake
Exhaust
Compressed spring force (installed)
Intake
Exhaust
Spring tilt
Intake
Exhaust
Winding direction (top view)
Intake
Exhaust
ENGINE SPECIFICATIONS
Standard
0.010 ~ 0.037 mm (0.0004 ~ 0.0015 in)
0.025 ~ 0.052 mm (0.0010 ~ 0.0020 in)
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1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in)
1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in)
40.38 mm (1.59 in)
40.38 mm (1.59 in)
35.00 mm (1.38 in)
35.00 mm (1.38 in)
171 ~ 197 N
(17.44 ~ 20.09 kg, 38.44 ~ 44.29 lb)
171 ~ 197 N
(17.44 ~ 20.09 kg, 38.44 ~ 44.29 lb)
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Clockwise
Clockwise
2 - 6
SPEC
Limit
0.08 mm
(0.0031 in)
0.10 mm
(0.0039 in)
0.010 mm
(0.0004 in)
1.6 mm
(0.06 in)
1.6 mm
(0.06 in)
38.36 mm
(1.51 in)
38.36 mm
(1.51 in)
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2.5°/1.8 mm
(2.5°/0.071 in)
2.5°/1.8 mm
(2.5°/0.071 in)
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