Yamaha WR426F(N) Owner's Service Manual page 80

MAINTENANCE SPECIFICATIONS (WR426F)
Piston rings:
Top ring
Type
Dimensions (B T)
End gap (installed)
Side clearance (installed)
2nd ring
Type
Dimensions (B T)
End gap (installed)
Side clearance
Oil ring
Dimensions (B T)
End gap (installed)
Crankshaft:
Crank width "A"
Runout limit "C"
Big end side clearance "D"
Small end free play "F"
Balancer:
Balancer drive method
Decompression device:
Type
Cable free play
Air filter oil grade:
Item
T
T
B
T
Standard
B
Barrel
1.2 3.5 mm (0.05
0.20 ~ 0.30 mm
(0.008 ~ 0.012 in)
0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in)
B
Taper
1.00 3.35 mm (0.04
0.35 ~ 0.50 mm
(0.014 ~ 0.020 in)
0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in)
2.0 2.9 mm (0.08
0.2 ~ 0.5 mm (0.01 ~ 0.02 in)
61.95 ~ 62.00 mm
(2.439 ~ 2.441 in)
0.03 mm (0.0012 in)
0.15 ~ 0.45 mm
(0.0059 ~ 0.0177 in)
0.4 ~ 1.0 mm (0.02 ~ 0.04 in)
Gear
Manual
5 ~ 9 mm (0.20 ~ 0.35 in)
Engine oil
2 - 7
SPEC
Limit
----
0.14 in) ----
0.55 mm
(0.022 in)
0.12 mm
(0.005 in)
----
0.13 in) ----
0.85 mm
(0.033 in)
0.12 mm
(0.005 in)
0.11 in) ----
----
----
0.05 mm
(0.002 in)
0.50 mm
(0.02 in)
2.0 mm
(0.08 in)
----
----
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