Crankshaft, Crank Case and Pistons - Honda CX and GL twins

For more information about the crankcase, crankshaft and pistons check out our articles below!




CMS-Japanese Motorcycle Supply Parts


Crankshaft

Here's a photo of a Honda CX500 crankshaft.

Specifications and Tolerances - CX500 Crank

Item Spec Service Limit
Main journal oil clearance 0.020-0.060mm
0.0008-0.0023"
0.085mm
0.0033"
Main journal oil clearance 0.020-0.060mm
0.0008-0.0023"
0.085mm
0.0033"
Crankpin oil clearance 0.028-0.052mm
0.0011-0.0020"
0.080mm
0.0031"
Conrod side clearance 0.150-0.350mm
0.0059-0.0138"
0.06mm
0.024"

Primary Drive Gear(s)

The primary drive gear setup is a split gear for the 500 variants - Turbo included - where it moved to a solid gear for the 650s and the split gear was moved to the clutch for those models.

Bearings

Crankshaft damage examples

Crank Case

Specifications and Tolerances

Item Spec Service Limit
Cylinder Internal Diameter
Cylinder Warpage No warpage 0.1mm
0.004"

Crankcase Breather

Crank Plate

Pistons





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CMS-Japanese Motorcycle Supply Parts