Crankshaft, Crank Case and Pistons – Honda CX and GL twins – Honda CX500, GL500, CX650, GL650

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

Crankshaft

Here's a photo of a Honda CX500 crankshaft.

Specifications and Tolerances – CX500 Crank

ItemSpecService Limit
Main journal oil clearance0.020-0.060mm
0.0008-0.0023″
0.085mm
0.0033″
Main journal oil clearance0.020-0.060mm
0.0008-0.0023″
0.085mm
0.0033″
Crankpin oil clearance0.028-0.052mm
0.0011-0.0020″
0.080mm
0.0031″
Conrod side clearance0.150-0.350mm
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

ItemSpecService Limit
Cylinder Internal Diameter
Cylinder WarpageNo warpage0.1mm
0.004″

Crankcase Breather

Crank Plate

Pistons

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