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1981 Honda CB900F Clutch Lock Nut

This 1981 CB900F hardware route contains a genuine Honda 16mm lock nut, sold individually. Its description covers clutch and oil-filter-rotor uses across several models, so verify the exact location and reference for your fitted assembly rather than assigning every listed use to the Supersport.

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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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1981 Honda CB900F Supersport · Clutch Lock Nut Buying guide

Confirm the lock nut by location and reference

The nut is identified as Honda 90231-KCS-651 with several superseded references. Match the parts diagram and actual assembly before ordering, especially if the engine or clutch has been changed.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Genuine Honda 16mm lock nutHonda 90231-KCS-651, sold individually; verify the exact service location.View part

A broad application needs a precise location

The product spans several models and mentions clutch-basket and oil-filter-rotor applications. Those uses are not automatically both present on the CB900F. Check the appropriate parts diagram or service information before choosing the nut, keeping its reference tied to the assembly actually being serviced.

Check the mating parts and locking method

A replacement nut cannot restore a damaged shaft thread or an incorrect assembly stack. Confirm the exact location in the parts information, inspect the mating components and use the Honda service procedure for holding, tightening and locking. The broad clutch-and-filter-rotor product description spans other Honda designs.

Buying questions

Can I use the broad oil-filter-rotor description to identify a CB900F filter nut?

No. The original F has a paper-element oil filter in a center-bolt housing. Confirm this nut’s required location and reference in the fitted clutch assembly; do not transfer centrifugal-filter-rotor uses from other motorcycles to this one.

Will a new lock nut fix damaged mating threads?

No. Inspect the shaft threads, nut engagement and associated locking parts before assembly. A damaged thread or incorrect stack of parts needs correction first. Follow the Honda holding and tightening procedure instead of using extra force to make the nut secure.

What changes after an engine or clutch swap?

Identify the actual assembly and check its parts information for the required nut and locking method. The original CB900F year and the general 16mm description cannot verify hardware in a different clutch or engine.

Not sure which part you need?

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

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