um UXPW125 - Page 4

UXPW 125 ENGINE SERVICE MANUAL AND EFI DIAGNOSTIC
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1.1 Maintenance Parameters：
Item
S tandard
Service Limit
Engine oil
Specification
SJ 10W/40
1.2 L
Capacity
when filter is not
removed
1 L
when filter is removed
1.1 L
when engine is completely
dry
1.2 L
Valve
Clearance
Inlet
0.04-0.06mm
0.10mm
Exhaust
0.04-0.06mm
0.15mm
Spark Plug
Standard
CPR8EA-9(NGK)
Long hours at high RPM
CPR9EA-9(NGK)
Electrode clearance
(0.8-1.0) mm
Engine idle speed
1400±100rpm
1.2 Cylinder Head and Valves unit：mm
Item
Standard
Service Limit
Valve Clearance
Inlet
0.04-0.06
Exhaust
0.04-0.06
Valve Stem Diameter
Inlet
4.975-4.990
4.92
Exhaust
4.955-4.970
4.90
Valve Guide Internal Diameter
Inlet
Exhaust
5.000-5.012
5.04
Valve/Valve Guide Clearance
Inlet
0.010-0.037
0.07
Exhaust
0.030-0.057
0.09
Width of valve sealing strip
0.9-1.1
1.5
Valve Spring Free Length
In
38.5-39.5
37.8
Outer
41.5-42.5
40.8
Rocker arm hole diameter
10.000-10.012
10.1
Rocker shaft diameter
9.973-9.984
9.91
Clearance between Rocker arm and rocker shaft
clearance
0.016-0.039
0.10
Camshaft
Cam Height
Inlet
31.830-31.930
31.8
Exhaust
31.559-31.659
31.5