5. Maintenance
3) MAINTENANCE SPECIFICATIONS
Items Standard Limit Measuring Device Remarks
Compression (kg/cm
2
) 8.8 7.3 Compression Gage
Bore (mm) ø32 Plating damaged Eye Checking
Diameter (mm) ø31.97 ø31.87 Micro Meter
Piston Ring
1.01 1.11 Thickness Gauge
Groove width (mm)
Piston Pin Hole (mm) ø8.01 ø8.05 Cylinder Gauge
Clearance between Micro Meter
0.03~0.06 0.15
Piston and Cylinder (mm) Cylinder Gauge
Clearance between
0.02~0.04 0.1 Thickness Gauge
Groove and Piston Ring (mm)
End Gap (mm) 0.05~0.25 0.5 Thickness Gauge
Width (mm) 0.98 0.93 Micro Meter
Piston Pin Diameter (mm) ø8 ø7.98 Micro Meter
Connecting Rod Small end (mm) ø11 ø11.05 Cylinder Gauge
Crankshaft Dia. at Main Bearing (mm) ø12 ø11.98 Micro Meter
Eccentricity (mm) — 0.07 Dial Gauge
Axial Play (mm) — 0.5 Thickness Gauge
Gritty or
Main Bearing — —
Feels Flat Spot
At the skirt end and
the right angle to
the piston pin.
When inserted in a
new cylinder.
Piston CylinderPiston Ring
4) CARBURETOR
Items Standard Limit Measuring Device Remarks
Metering Lever set (mm) 1.65 ± 0.16 Vanier
Inlet Valve Opening Pressure (kg/cm
2
) 1.3~2.3 Leak Tester
Inlet Valve Closing Pressure (kg/cm
2
) 0.7~1.7 Leak Tester
6
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