Yamaha YZ426FP Manuel D'atelier Du Proprietaire page 79

Valve seat width
Valve spring:
Free length
Set length (valve closed)
Compressed pressure
(installed)
Tilt limit *
Direction of winding
(top view)
Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Piston off-set
Piston pin bore inside diameter
Piston pin outside diameter
MAINTENANCE SPECIFICATIONS
Item
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
H
D
Standard
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
41.36 mm (1.63 in)
43.60 mm (1.72 in)
32.87 mm (1.29 in)
35.38 mm (1.39 in)
112.8 ~ 129.8 N
(11.5 ~ 13.2 kg, 25.35 ~ 29.10 lb)
116.3 ~ 133.9 N
(11.9 ~ 13.7 kg, 26.23 ~ 30.20 lb)
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Clockwise
Clockwise
0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in)
94.945 ~ 94.960 mm
(3.738 ~ 3.739 in)
9 mm (0.354 in)
1 mm (0.0394 in)
19.004 ~ 19.015 mm
(0.7482 ~ 0.7486 in)
18.991 ~ 19.000 mm
(0.7477 ~ 0.7480 in)
2 - 6
SPEC
Limit
1.6 mm
(0.0630 in)
1.6 mm
(0.0630 in)
39.3 mm
(1.55 in)
41.4 mm
(1.63 in)
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----
----
----
2.5˚/ 1.8 mm
(2.5˚/0.071 in)
2.5˚/1.9 mm
(2.5˚/0.075 in)
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----
0.1 mm
(0.004 in)
----
----
----
19.045 mm
(0.7498 in)
18.971 mm
(0.7469 in)