Yamaha 2001 YJ50RAP, Service Manual

Page: 25 / 228

2 - 3
SPEC
ENGINE SPECIFICATIONS
Piston
Piston-to-cylinder clearance 0.03 ~ 0.05 mm (0.0012 ~ 0.0020 in) 0.10 mm
(0.0039 in)
Diameter D 39.952 ~ 39.969 mm (1.5729 ~ 1.5736 in) ----
Height H 5 mm (0.2 in) ----
Oversize 1st ---- ----
Oversize 2nd ---- ----
Piston pin bore (in the piston)
Diameter 10.004 ~ 10.015 mm (0.3939 ~ 0.3943 in) 10.045 mm
(0.3955 in)
Offset 0 mm (0 in) ----
Piston pin
Outside diameter 9.996 ~ 10.000 mm (0.3935 ~ 0.3937 in) 9.976 mm
(0.3928 in)
Piston-pin-to-piston-pin-bore clear-
ance 0.004 ~ 0.019 mm (0.00016 ~ 0.00075 in) 0.069 mm
(0.0027 in)
Piston ring
Top ring
Ring type Keystone ----
Dimensions (B
×
T) 1.2
×
1.8 mm (0.05
×
0.07 in) ----
End gap (installed) 0.15 ~ 0.35 mm (0.006 ~ 0.014 in) 0.70 mm
(0.028 in)
Ring side clearance 0.03 ~ 0.05 mm (0.0012 ~ 0.0020 in) 0.10 mm
(0.0039 in)
2nd ring
Ring type Keystone ----
Dimensions (B
×
T) 1.2
×
1.8 mm (0.05
×
0.07 in) ----
End gap (installed) 0.15 ~ 0.35 mm (0.006 ~ 0.014 in) 0.70 mm
(0.028 in)
Ring side clearance 0.03 ~ 0.05 mm (0.0012 ~ 0.0020 in) 0.10 mm
(0.0039 in)
Item Standard Limit
D
H
B
T
B
T
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