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1975 Honda CB400F 16mm Lock Nut

This is the nut, not a socket. It is genuine Honda, 16mm, sold each. Fitment names the 1975-77 CB400F along with several other CBs. The note says quantity required is commonly one where it is used.

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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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1975 Honda CB400F · Fasteners & Hardware Buying guide

One nut, two jobs it may cover

Use it on a clutch basket or an oil-filter rotor that takes this 16mm nut. It is sold each. Do not order it as a tool.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 16mm lock nutGenuine Honda, sold each. For clutch basket and oil-filter rotor applications. Replaces 90231-KCS-651. Names the 1975-77 CB400F. The text says one is common where the nut is used.View part

Nut, not the socket that turns it

The 24mm clutch tool is a different product. This 16mm nut is the hardware those jobs sometimes replace. Match 90231-KCS-651, or one of the superseded numbers printed on the product, to the nut you removed.

Commonly one is not a promise for every engine

The product says quantity required is commonly one where used. If your clutch nut and your rotor nut are both this part, that is two positions, and each purchase is still one nut. The text does not say this Supersport uses two.

Lock-nut questions

Is it sold each?

Yes. It is one genuine Honda nut per purchase. The note says one is common where the nut is used.

Which number does it replace?

90231-KCS-651, and the product also lists 90231-200-010, 90231-028-000, and other superseded numbers. Fitment includes the 1975-77 CB400F.

Is it a clutch tool?

No. It is the 16mm nut. The clutch center-nut sockets are separate tools.

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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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