Zenoah 966669901, Owner'S Manual

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12
MAINTENANCE
3) MAINTENANCE SPECIFICATIONS
G240RC G270RC G290RC
Items Standard Limit Standard Limit Standard Limit Measuring Device Remarks
Bore (mm) ø32 Plating damaged ø34 Plating damaged ø36 Plating damaged Eye Checking
Diameter (mm) ø31.97 ø31.87 ø33.97 ø33.87 ø35.97 ø35.87 Micro Meter
Piston Ring
0.81 0.91 1.01 1.11 1.01 1.11 Thickness Gauge
Groove width (mm)
Piston Pin Hole (mm) ø8.01 ø8.05 ø8.01 ø8.05 ø8.01 ø8.05 Cylinder Gauge
Clearance between
Piston and 0.03~0.06 0.15 0.03~0.06 0.15 0.03~0.06 0.15
Cylinder (mm)
Clearance between
Groove and 0.02~0.04 0.1 0.02~0.04 0.1 0.02~0.04 0.1 Thickness Gauge
Piston Ring (mm)
End Gap (mm) 0.05~0.25 0.5 0.05~0.25 0.5 0.05~0.25 0.5 Thickness Gauge
Width (mm) 0.78 0.73 0.98 0.93 0.98 0.93 Micro Meter
Piston Pin Diameter (mm) ø8 ø7.98 ø8 ø7.98 ø8 ø7.98 Micro Meter
Connecting Rod Small end (mm) ø11 ø11.05 ø11 ø11.05 ø11 ø11.05 Cylinder Gauge
Crankshaft Dia. at Main Bearing (mm) ø12 ø11.98 ø12 ø11.98 ø12 ø11.98 Micro Meter
Eccentricity (mm) — 0.07 — 0.07 — 0.07 Dial Gauge
Axial Play (mm) — 0.5 — 0.5 — 0.5 Thickness Gauge
Gritty or Gritty or Gritty or
Main Bearing — — — —
Feels Flat Spot Feels Flat Spot Feels Flat Spot
At the skirt end and
the right angle to
the piston pin.
When inserted in
a new cylinder.
Piston
Cylinder
Piston
Ring
Micro Meter
Cylinder Gauge