Yamaha YFM660RN Service Manual page 28

Item
Stem-to-guide clearance
Stem runout limit
Valve seat width
Valve spring:
Free length
Set length (valve closed)
Compressed pressure
(installed)
*
Tilt limit
Direction of winding
(top view)
MAINTENANCE SPECIFICATIONS
IN 0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
EX 0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
----
IN 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
EX 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
IN 35.95 mm (1.42 in)
EX 37.75 mm (1.49 in)
IN 27.2 mm (1.07 in)
EX 30.7 mm (1.21 in)
IN 149 ~ 173 N (15.19 ~ 17.64 kg,
33.50 ~ 38.89 lb)
EX 165 ~ 191 N (16.83 ~ 19.49 kg,
37.09 ~ 42.94 lb)
IN
EX
IN Clockwise
EX Clockwise
2 - 6
SPEC
Standard
2.5°/1.6 mm
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Limit
0.08 mm
(0.0031 in)
0.10 mm
(0.0039 in)
0.01 mm
(0.0004 in)
1.6 mm
(0.0630 in)
1.6 mm
(0.0630 in)
34.15 mm
(1.34 in)
35.86 mm
(1.41 in)
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(2.5°/0.06 in)
2.5°/1.6 mm
(2.5°/0.06 in)
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