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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...

1982 Honda CB900C Custom · Clutch Lock-Nut Hardware Buying guide

Identify the clutch lock nut and its locking hardware

The genuine Honda 90231-KCS-651 item is the listed 16 mm clutch lock nut for this application. Honda’s CB900C clutch procedure shows a lock nut and separate lock washer. Inspect the fitted clutch and its threads before ordering this individual replacement.

Keep the clutch nut distinct from rotor and filter hardware

The broad product title also names oil-filter rotors used on other Honda applications. The CB900C instead has a paper oil-filter element in a bolt-secured housing, and its alternator rotor has a retaining bolt. Do not transfer that broad rotor wording to either CB900C location.

Order hardware after inspection

The nut is supplied individually and does not include a clutch rebuild kit, lock washer or removal tool. Follow the Honda clutch procedure for the locking parts and assembly. A listed 16 mm nut size and a tool’s 24 mm engagement are different measurements.

Clutch Lock-Nut Hardware questions

Can this nut be used as the CB900C alternator rotor fastener?

Honda shows a retaining bolt at the alternator rotor. The listed nut is used for the clutch application here; the broad product title’s rotor wording does not establish an alternator-nut fitment for the Custom.

Does buying the nut also supply the clutch locking washer?

No. This is one genuine Honda nut. Honda shows the clutch lock washer separately, so inspect and identify that locking component and the mating threads while planning the repair.

Can a 24 mm clutch tool be rejected because the nut is listed as 16 mm?

Those dimensions describe different features. The tool’s engagement diameter is not the nut’s thread size. Match the specified castellated nut application and the tool’s driver connection instead of comparing the two numbers as though they measure the same part.

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