Yamaha YXR70FX Service Manual page 42

Item
Valve-stem-to-valve-guide clearance
Intake
Exhaust
Valve stem runout
Valve spring
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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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 kgf, 38.44 ~ 44.29 lb)
171 ~ 197 N
(17.44 ~ 20.09 kgf, 38.44 ~ 44.29 lb)
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Clockwise
Clockwise
2 - 7
SPEC
Limit
0.080 mm
(0.0031 in)
0.100 mm
(0.0039 in)
0.040 mm
(0.0016 in)
38.36 mm
(1.51 in)
38.36 mm
(1.51 in)
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2.5°/1.80 mm
(2.5°/0.071 in)
2.5°/1.80 mm
(2.5°/0.071 in)
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