Yamaha 5YF2-AE1, Service Manual

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SPEC
ENGINE SPECIFICATIONS
Piston
Piston to cylinder clearance 0.025 ~ 0.045 mm
(0.0010 ~ 0.0018 in) 0.15 mm
(0.0059 in)
Piston size “D” 38.960 ~ 38.975 mm
(1.5339 ~ 1.5344 in) ----
Measuring point “H” 5.0 mm (0.20 in) ----
Oversize 2nd 39.5 mm (1.56 in) ----
4th 40.0 mm (1.57 in) ----
Piston off-set 0.5 mm (0.02 in) ----
Piston off-set direction Intake side ----
Piston pin bore inside diameter 13.002 ~ 13.013 mm
(0.5119 ~ 0.5123 in) 13.043 mm
(0.5135 in)
Piston pin outside diameter 12.996 ~ 13.000 mm
(0.5117 ~ 0.5118 in) 12.976 mm
(0.5109 in)
Piston rings
Top ring
Type Barrel ----
Dimensions (B
×
T) 1.0
×
1.7 mm
(0.0394
×
0.0669 in)
----
End gap (installed) 0.08 ~ 0.20 mm
(0.0031 ~ 0.0079 in) 0.45 mm
(0.0177 in)
Side clearance (installed) 0.030 ~ 0.065 mm
(0.0012 ~ 0.0026 in) 0.12 mm
(0.0047 in)
2nd ring
Type Taper ----
Dimensions (B
×
T) 1.0
×
1.7 mm
(0.0394
×
0.0669 in)
----
End gap (installed) 0.05 ~ 0.20 mm
(0.0020 ~ 0.0079 in) 0.55 mm
(0.0217 in)
Side clearance 0.020 ~ 0.055 mm
(0.0008 ~ 0.0022 in) 0.12 mm
(0.0047 in)
Item Standard Limit
H
D
T
B
B
T