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1973 Honda CB500K Black Drive-Chain Cover Choices

For a 1973 CB500K chain-cover replacement, compare the mounting tabs and existing guard shape before deciding between the black plastic options. Both cover the drive-chain area. Changes to the swingarm, shocks or wheel can affect the comparisons needed around the new guard.

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Honda CB550K CB500K chain cover guard 40510-323-000B

1971-78 Honda CB550K / CB500K Chain Cover Guard ~ Replaces 40510-323-000B

$219.95 USD
73-0001
Restore the original look and protection of your motorcycle’s drive chain with this Chain Cover Guard, designed as a direct replacement for the factory...
Honda CB550K CB500K drive chain case chain cover guard 40510-323-000

1971-78 Honda CB550K / CB500K Drive Chain Case / Chain Cover Guard ~ Replaces Honda OEM 40510-323-000

$139.95 USD
51-7254
Aftermarket black plastic drive chain case / chain cover guard for select Honda CB500K and CB550K models. This replacement helps restore the factory-style look...
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1973 Honda CB500K · Drive-Chain Covers Buying guide

Compare the existing guard supports before choosing a cover

The two individual black plastic covers share the 40510-323-000 reference family. One is described as Japan-made; the other is an aftermarket chain case. Read their details and match the retained motorcycle’s mounting arrangement.

Parts to consider

1971-78 Honda CB550K / CB500K Chain Cover Guard ~ Replaces 40510-323-000B Japan-made black chain coverOne black plastic guard referencing 40510-323-000B, with a stated 1973 CB500K application. Confirm the guard supports and chain, tire and shock clearances.View part 1971-78 Honda CB550K / CB500K Drive Chain Case / Chain Cover Guard ~ Replaces Honda OEM 40510-323-000 Aftermarket black drive-chain caseOne plastic guard referencing 40510-323-000 and 40510-323-000B. Compare the existing cover style and mounting tabs; chain, sprockets and rear suspension are separate parts.View part

Use the reference alongside the mounting shape

The Japan-made guard references 40510-323-000B, and the aftermarket case references 40510-323-000 with the B suffix also noted. These references help identify the offered application but do not establish every modified swingarm’s mounts. Compare the fitted guard style and supports before selecting either replacement.

A cover does not service the chain drive

Both products cover the drive-chain area. Their listings do not include replacement chain or sprockets, and the source calls for clearance checks around the moving assembly. Inspect the retained drive components separately and use the appropriate service information rather than treating the guard as a complete final-drive repair.

Questions before choosing

How should I choose between the two black chain covers?

Both replace the 40510-323-000 reference family and are individually supplied. The first is Japanese-made; the alternate is described as aftermarket. Compare the original guard shape and supports, then choose one replacement rather than a two-cover package.

Will original chain-cover mounts still work after a suspension change?

The aftermarket listing calls out swapped swingarms, modified shocks and custom rear suspension. Compare its mounting tabs and bolt locations with the changed assembly; a stock-model application cannot establish fit on a different mounting arrangement.

Which surrounding parts need a guard-clearance check?

Check the chain, rear sprocket, shocks and tire through the suspension’s movement range. The guard’s fit depends on those clearances as well as its supports, and correct chain alignment, adjustment and lubrication remain separate requirements.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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