Zenoah G300PUM Owner's Manual page 14

11. Maintenance
3) MAINTENANCE SPECIFICATIONS
Items
Cylinder Bore (mm)
Diameter (mm)
Piston Ring
Groove width (mm)
Piston
Piston Pin Hole (mm)
Clearance between
Piston and
Cylinder (mm)
Clearance between
Groove and
Piston Ring (mm)
Piston End Gap (mm)
Ring
Width (mm)
Piston Pin Diameter (mm)
Connecting Rod Small end (mm)
Crankshaft Dia. at Main Bearing (mm)
Eccentricity (mm)
Axial Play (mm)
Main Bearing
14
G300PUM
Standard Limit
ø36 Plating damaged
ø35.97 ø35.87
1.01 1.11
ø8.01 ø8.05
0.03~0.06 0.15
0.02~0.04 0.1
0.05~0.25 0.5
0.98 0.93
ø8 ø7.98
ø11 ø11.05
ø12 ø11.98
— 0.07
— 0.5
Gritty or
—
Feels Flat Spot
Measuring Device
Eye Checking
At the skirt end and the right
Micro Meter
angle to the piston pin.
Thickness Gauge
Cylinder Gauge
Micro Meter
Cylinder Gauge
Thickness Gauge
When inserted in a new cylinder.
Thickness Gauge
Micro Meter
Micro Meter
Cylinder Gauge
Micro Meter
Dial Gauge
Thickness Gauge
—
Remarks