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1978 Honda CB550K Chain Cover Replacement Choices

Compare the two black plastic chain-guard choices with the guard and swingarm actually fitted. Their reference descriptions are useful starting points, but changed brackets or rear suspension need an additional check. Confirm any mounting hardware required before treating the guard as a complete replacement package.

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Currently viewing License Plate / Grab Bar / Chain 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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1978 Honda CB550K · License Plate / Grab Bar / Chain Guard Buying guide

Check the mounting pattern before selecting a chain cover

Both choices are described as black plastic chain guards for the listed CB550K application. Compare the old outline and attachment points, then confirm which retained fasteners and brackets will be used with the replacement.

Parts to consider

1971-78 Honda CB550K / CB500K Chain Cover Guard ~ Replaces 40510-323-000B Japan-made black plastic chain guardBlack plastic replacement guard referencing 40510-323-000B and described as made in Japan. Compare the retained guard pattern and mounts before choosing it.View part

Related parts: Alternative aftermarket chain case

Compare references alongside the existing shape

One guard lists 40510-323-000B, while the other lists 40510-323-000 and cross-references the B version. Both are described as black plastic replacements. Use those references together with the old outline and attachment points, rather than assuming that a reference alone covers a changed mounting arrangement.

Account for earlier rear-end changes

The aftermarket guard notes call for checking swapped swingarms, modified shocks and custom rear suspension setups. Inspect those parts before ordering, and confirm any missing guard mounting hardware independently. The descriptions do not turn a guard purchase into a complete collection of brackets and fasteners.

Common questions

Is either chain guard a metal part?

Both current guard choices are described as black plastic. One is also described as made in Japan. Compare their listed reference patterns and photographs with the guard and swingarm fitted before choosing the replacement.

Are guard mounting bolts included?

The descriptions do not itemize a complete fastener package. Inspect the retained guard brackets and bolts, then confirm what additional hardware is needed rather than assuming every mounting piece accompanies the plastic guard.

Which check matters most on a custom rear end?

Compare the actual guard attachment points and nearby swingarm and shock arrangement. The aftermarket listing expressly calls for this check on changed rear ends; the motorcycle model does not identify custom brackets or mounts.

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