Yamaha YFM7FGPW Service Manual page 44

Item
Piston
Piston-to-cylinder clearance
Diameter "D"
D
Height "H"
Offset
Offset direction
Piston pin bore inside diameter
Piston pin outside diameter
Piston-pin-to-piston-pin-bore clear-
ance
Piston rings
Top ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
2nd ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
ENGINE SPECIFICATIONS
0.030 ~ 0.055 mm (0.0012 ~ 0.0022 in)
101.955 ~ 101.970 mm
(4.0140 ~ 4.0146 in)
H
10.0 mm (0.39 in)
0.50 mm (0.0197 in)
Intake side
23.004 ~ 23.015 mm (0.9057 ~ 0.9061 in) 23.045 mm
22.991 ~ 23.000 mm (0.9052 ~ 0.9055 in) 22.971 mm
0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)
B
T
Barrel
1.20 × 3.80 mm (0.05 × 0.15 in)
0.20 ~ 0.35 mm (0.008 ~ 0.014 in)
0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in)
B
T
Taper
1.20 × 4.00 mm (0.05 × 0.16 in)
0.75 ~ 0.90 mm (0.030 ~ 0.035 in)
0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in)
2 - 8
SPEC
Standard Limit
0.13 mm
(0.0051 in)
----
----
----
----
(0.9073 in)
(0.9044 in)
0.074 mm
(0.0029 in)
----
----
0.60 mm
(0.024 in)
0.12 mm
(0.0047 in)
----
----
1.25 mm
(0.049 in)
0.13 mm
(0.0051 in)