um UXPW125 - Page 5

UXPW 125 ENGINE SERVICE MANUAL AND EFI DIAGNOSTIC
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1.3 Cylinder and Piston unit: mm
Item
S tandard
Service Limit
Cylinder
Inner diameter of cylinder
Φ52.400～φ52.410
Φ52.5
Cylindricity
0.004
0.10
Planeness of cylinder face
0.03
0.10
Piston, Piston
Rings and
Piston Pin
Outer diameter of piston
Φ52.38～φ52.39
Φ52.3
Inner diameter of piston pin hole
φ14.002～14.008
φ14.04
Closure clearance of
piston ring
Top
0.1～0.25
0.35
Second
0.15-0.30
0.4
Oil
0.2～0.7
0.85
Piston Ring/Groove
Clearance:
Top
0.02～0.06
0.10
Second
0.02～0.06
0.10
Piston/Cylinder Clearance
0.01～0.03
0.07
Outer diameter of piston pin
φ13.994～φ14
φ13.96
Clearance between piston pin and piston
pin hole
0.002～0.014
0.04
Small End of
Connecting
Rod
Inner diameter
φ14.015～14.028
φ14.06
Clearance between small end of
connecting rod and piston pin
0.015～0.03
0.10