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1972 Honda CB350K4 Oil-Filter Rotor Lock Nut

Choose the 1972 CB350K4 rotor lock nut by its actual position in the centrifugal oil-filter assembly. The genuine Honda replacement is sold individually and lists the earlier rotor-nut reference. Inspect the nut and surrounding hardware before treating it as a routine replacement during service.

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Honda CB1100 CB1000 CB900 CB750 16mm clutch oil filter rotor lock nut 90231-KCS-651

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651

$10.95 USD
99-5383
This genuine Honda 16mm lock nut is used on compatible Honda CB clutch basket and oil filter rotor assemblies. It is a small hardware...
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1972 Honda CB350K4 · Oil-Filter Rotor Nut Buying guide

Identify the centrifugal rotor nut before ordering

This is replacement hardware for the oil-filter rotor. The K4 clutch’s external circlip is a different retaining arrangement, even though the product title covers clutch applications on other Honda models.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Genuine Honda rotor lock nut16 mm lock nut sold each. The replacement list includes original rotor-nut reference 90231-200-010.View part

Match the replacement list to the original part

The genuine Honda nut carries current reference 90231-KCS-651, and the product’s replacement list includes 90231-200-010. Use the original rotor position and that reference when checking the order. A broad clutch/oil-filter title does not make every named location applicable to the K4.

Inspect the surrounding rotor hardware

The nut is sold each. Check the rotor, special angled washer and tool-engagement surfaces during service, using the Honda manual for assembly requirements. The nut’s nominal size is not sufficient to select a socket, and a damaged nut should not be forced with an ill-fitting tool.

Buying questions

Is this the nut at the center of the K4 clutch?

Honda’s K4 clutch uses external circlip retention. The relevant application here is the centrifugal oil-filter rotor nut, so identify that location before ordering from the broader product title.

How many nuts are supplied?

The genuine Honda lock nut is sold individually. Order for the rotor position being renewed rather than assuming a package of several fasteners.

Does 16 mm mean I should use a standard 16 mm socket?

No. The 16 mm description does not establish the external tool engagement. Match the proper lock-nut tool to the nut and follow the service manual for removal and installation.

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