Yamaha YFM4FAR Service Manual page 31

*
Tilt limit
Direction of winding
(top view)
Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Piston offset
Offset direction
Piston pin bore inside diameter
Piston pin outside diameter
Piston rings:
Top ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
MAINTENANCE SPECIFICATIONS
Item
IN
EX
IN
EX
H
D
T
Standard
Clockwise
Clockwise
0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in)
84.445 ~ 84.460 mm
(3.3246 ~ 3.3252 in)
5 mm (0.20 in)
0.5 mm (0.0200 in)
Intake side
20.004 ~ 20.015 mm
(0.7876 ~ 0.7880 in)
19.991 ~ 20.000 mm
(0.7870 ~ 0.7874 in)
B
Barrel
1.2 × 3.1 mm
(0.04724 × 0.1220 in)
0.20 ~ 0.40 mm
(0.0079 ~ 0.0157 in)
0.03 ~ 0.08 mm
(0.0012 ~ 0.0031 in)
2 - 7
SPEC
Limit
2.5°/1.6 mm
(2.5°/0.06 in)
2.5°/1.6 mm
(2.5°/0.06 in)
----
----
0.150 mm
(0.0059 in)
----
----
----
----
20.045 mm
(0.7892 in)
19.971 mm
(0.7863 in)
----
----
0.65 mm
(0.0256 in)
0.13 mm
(0.0051 in)