Piston Dimensions & Clearances

Dimensional Specifications
Cylinder Bore Diameter and Piston Fit:
Standard Diameter:
Piston 80.985 mm
Bore 81.010 mm
1st Oversize Diameter:
Piston 81.485 mm
Bore 81.510 mm
2nd Oversize Diameter:
Piston 81.985 mm
Bore 82.010 mm
Deviation from Piston Dimension:
Maximum 0.04 mm (0.0015 inch)
Deviation from Cylinder Bore Dimension:
Maximum 0.08 mm (0.0031 inch)

Piston Ring:
End Gap:
Compression Ring:
New 0.20 to 0.40 mm
Wear limit 1.00 mm
Tapered Step Ring:
New 0.20 to 0.40 mm
Wear limit 1.00 mm
Oil Control Ring:
New 0.25 to 0.50 mm
Wear limit 1.00 mm
Side Clearence:
Compression Ring:
New 0.02 to 0.07 mm
Wear limit 0.15 mm
Tapered Step Ring:
New 0.03 to 0.06 mm
Wear limit 0.15 mm
Oil Control Ring:
New 0.02 to 0.06 mm
Wear limit 0.15 mm