Yamaha 2000 YFM400FWA Service Manual page 29

Stem runout limit
Valve seat width
Valve spring:
Inner spring
Free length
Set length (valve closed)
Compressed pressure
(installed)
Tilt limit
*
Direction of winding
(top view)
Outer spring
Free length
Set length (valve closed)
MAINTENANCE SPECIFICATIONS
Item
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
Standard
----
1.2 ~ 1.4 mm
(0.0472 ~ 0.0551 in)
1.2 ~ 1.4 mm
(0.0472 ~ 0.0551 in)
39.9 mm (1.57 in)
39.9 mm (1.57 in)
33.6 mm (1.32 in)
33.6 mm (1.32 in)
104.9 ~ 120.6 N (10.70 ~
12.30 kg, 23.58 ~ 27.11 lb)
104.9 ~ 120.6 N (10.70 ~
12.30 kg, 23.58 ~ 27.11 lb)
Counterclockwise
Counterclockwise
43.27 mm (1.70 in)
43.27 mm (1.70 in)
36.6 mm (1.44 in)
36.6 mm (1.44 in)
2 - 7
SPEC
Limit
0.01 mm
(0.0004 in)
----
----
37.9 mm
(1.49 in)
37.9 mm
(1.49 in)
----
----
----
----
2.5˚/1.6 mm
(2.5˚/0.06 in)
2.5˚/1.6 mm
(2.5˚/0.06 in)
----
----
41.27 mm
(1.62 in)
41.27 mm
(1.62 in)
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----