Motor Top End Specifications

S Series S1, KH250 S2 S3, KH400
  Standard Service Limit Standard Service Limit Standard Service Limit
Bore Diameter 45.106mm
1.772in.
45.15mm
1.778in.
53.000-53.019mm
2.0866-2.0873in.
53.15mm
2.0925in.
57.0-57.019mm
2.2441-2.2448in.
57.15mm
2.250in.
Bore Taper and out-of-round. (Max) 0.05mm
0.002in.
  0.05mm
0.002in.
  0.05mm
0.002in.
 
Piston Skirt Diameter
(5mm from bottom of skirt at right angle to piston pin
44.975mm
1.7707in.
+0.005/-0.025mm
+0.0002/-0.001in.
52.975mm
2.0856in.
+0.005/-0.025mm
+0.0002/-0.001in.
56.934mm
2.2415in.
+0.005/-0.025mm
+0.0002/-0.001in.
Piston-to-Cylinder Clearance
*Eng# 0~04593
0.012-0.020mm
0.0005-0.0008in.
*0.021-0.029mm
*0.0008~0.0011in
0.027-0.035mm
0.0011-0.0014in.
  0.078-0.086mm
0.0031-0.0034in.
 
Top Piston Ring-to-groove Clearance 0.09-0.13mm
0.0035-0.0051in.
0.17mm
0.0067in.
0.09-0.13mm
0.0035-0.0051in.
0.17mm
0.0067in.
0.09-0.13mm
0.0035-0.0051in.
0.17mm
0.0067in.
Bottom Piston Ring-to-groove Clearance 0.05-0.09mm
0.0020-0.0035in.
0.12mm
0.0047in.
0.05-0.09mm
0.0020-0.0035in.
0.12mm
0.0047in.
0.05-0.09mm
0.0020-0.0035in.
0.12mm
0.0047in.
  Thickness Width Thickness Width Thickness Width
Top Piston Ring Dimensions 1.47-1.49mm
0.0579-0.0595in.
2.0-2.2mm
0.0787-0.0866in.
1.47-1.49mm
0.0579-0.0595in.
2.2-2.4mm
0.0866-0.0945in.
1.47-1.49mm
0.0579-0.0595in.
2.3-2.5mm
0.0905-0.0985in.
Bottom Piston Ring Dimensions 1.47-1.49mm
0.0579-0.0595in.
2.0-2.2mm
0.0787-0.0866in.
1.47-1.49mm
0.0579-0.0595in.
2.2-2.4mm
0.0866-0.0945in.
1.47-1.49mm
0.0579-0.0595in.
1.9-2.1mm
0.0747-0.0827in.
  Height Depth Height Depth Height Depth
Top Piston Ring Groove Dimensions 1.58-1.60mm
0.0622-0.0630in.
2.466-2.566mm
0.0971-0.1010in.
1.58-1.60mm
0.0622-0.0630in.
2.4-2.6mm
0.0945-0.1024in.
1.58-1.60mm
0.0622-0.0630in.
2.591-2.641mm
0.1019-0.1040in.
Bottom Piston Ring Groove Dimensions 1.54-1.56mm
0.0607-0.0615in.
2.466-2.566mm
0.0971-0.1010in.
1.54-1.56mm
0.0607-0.0615in.
2.4-2.6mm
0.0945-0.1024in.
1.54-1.56mm
0.0607-0.0615in.
2.591-2.641mm
0.1019-0.1040in.
  Standard Service Limit Standard Service Limit Standard Service Limit
Piston Ring End Gap 0.2-0.3mm
0.008-0.0120in.
0.8mm
0.031in.
0.2-0.3mm
0.008-0.0120in.
0.8mm
0.031in.
0.15-0.35mm
0.006-0.014in.
0.7mm
0.028in.
Top Ring Free End Gap 6.0mm
0.24in.
  6.5mm
0.256in.
  6.0mm
0.24in.
 
Bottom Ring Free End Gap 6.0mm
0.24in.
  6.5mm
0.256in.
  8.5mm
0.335in.
 
Wrist Pin Bearing Radial Clearance 0.003-0.022mm
0.00012-0.00088in.
0.10mm
0.0039in.
0.003-0.022mm
0.00012-0.00088in.
0.10mm
0.0039in.
0.003-0.022mm
0.00012-0.00088in.
0.10mm
0.0039in.
Connecting Rod Side Clearance 0.40-0.50mm
0.0157-0.0197in.
0.70mm
0.0276in.
0.40-0.50mm
0.0157-0.0197in.
0.70mm
0.0276in.
0.40-0.50mm
0.0157-0.0197in.
0.70mm
0.0276in.
Connecting Rod Radial Clearance 0.025-0.035mm
0.0001-0.0014in.
0.10mm
0.004in.
0.025-0.035mm
0.0001-0.0014in.
0.10mm
0.004in.
0.024-0.034mm
0.00095-0.00134in.
0.10mm
0.0039in.
Crankshaft Runout Less than 0.04mm
0.0016in.
0.10mm
0.0039in.
Less than 0.04mm
0.0016in.
0.10mm
0.0039in.
Less than 0.04mm
0.0016in.
0.10mm
0.0039in.

 

H Series H1, KH500 H2
  Standard Service Limit Standard Service Limit
Bore Diameter 60.0-60.019mm
2.3622-2.3629in.
60.15mm
2.3681in.
71.0-71.019mm
2.7953-2.7960in.
71.15mm
2.8012in.
Bore Taper and out-of-round. (Max) 0.05mm
0.002in.
  0.05mm
0.002in.
 
Piston Skirt Diameter
(5mm from bottom of skirt at right angle to piston pin
59.975mm
2.36122in.
  70.946mm
2.79314in.
 
Piston-to-Cylinder Clearance 0.062-0.700mm
0.0022-0.0028in.
  0.070-0.078mm
0.0028 -0.0031in.
 
Top Piston Ring-to-groove Clearance 0.09-0.13mm
0.0035-0.0051in.
0.17mm
0.0067in.
0.09-0.13mm
0.0035-0.0051in.
0.17mm
0.0067in.
Bottom Piston Ring-to-groove Clearance 0.05-0.09mm
0.0020-0.0035in.
0.12mm
0.0047in.
0.05-0.09mm
0.0020-0.0035in.
0.12mm
0.0047in.
  Thickness Width Thickness Width
Top Piston Ring Dimensions 1.47-1.49mm
0.0579-0.0595in.
2.4-2.6mm
0.0944-0.1024in.
1.47-1.49mm
0.0579-0.0595in.
2.9-3.1mm
0.0114-0.122in.
Bottom Piston Ring Dimensions 1.47-1.49mm
0.0579-0.0595in.
1.8-2.0mm
0.0708-0.0788in.
1.47-1.49mm
0.0579-0.0595in.
2.6-2.8mm
0.102-0.110in.
  Height Depth Height Depth
Top Piston Ring Groove Dimensions 1.58-1.60mm
0.0622-0.0630in.
2.6-2.8mm
0.1024-0.1102in.
1.58-1.60mm
0.0622-0.0630in.
3.13-3.33mm
0.1233-0.1311in.
Bottom Piston Ring Groove Dimensions 1.54-1.56mm
0.0607-0.0615in.
2.6-2.8mm
0.1024-0.1102in.
1.54-1.56mm
0.0607-0.0615in.
3.13-3.33mm
0.1233-0.1311in.
  Standard Service Limit Standard Service Limit
Top Ring End Gap 0.2-0.3mm
0.008-0.012in.
0.8mm
0.031in.
0.2-0.4mm
0.008-0.016in.
0.8mm
0.031in.
Bottom Ring End Gap 0.2-0.3mm
0.008-0.012in.
0.8mm
0.031in.
0.2-0.4mm
0.008-0.016in.
0.8mm
0.031in.
Top Ring Free End Gap 7.0mm
0.276in.
  8.0mm
0.315in.
 
Bottom Ring Free End Gap 9.5mm
0.374in.
  8.0mm
0.315in.
 
Wrist Pin Bearing Radial Clearance 0.003-0.022mm
0.00012-0.00088in.
0.10mm
0.0039in.
0.003-0.022mm
0.00012-0.00088in.
0.10mm
0.0039in.
Connecting Rod Side Clearance 0.40-0.50mm
0.0157-0.0197in.
0.70mm
0.0276in.
0.40-0.50mm
0.0157-0.0197in.
0.70mm
0.0276in.
Connecting Rod Radial Clearance 0.025-0.035mm
0.00098-0.00138in.
0.10mm
0.0039in.
0.025-0.035mm
0.00098-0.00138in.
0.10mm
0.0039in.
Crankshaft Runout Less than 0.04mm
0.0016in.
0.10mm
0.0039in.
Less than 0.04mm
0.0016in.
0.10mm
0.0039in.

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