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1971 Honda CB175K1 Clutch/Rotor Lock Nut

An internal lock nut should be selected from the assembly being serviced, particularly on a replacement engine. This 16 mm item is sold individually under Honda reference 90231-KCS-651. Confirm the specified location and part number before deciding it belongs in the repair order.

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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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1971 Honda CB175K1 · Clutch/Rotor Lock Nut Buying guide

Identify the assembly before selecting its lock nut

The catalog describes clutch-basket and oil-filter-rotor uses across several motorcycles. That broad description is not a location map for this exact engine; use the fitted assembly and its documented reference.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 16 mm clutch/rotor lock nutGenuine Honda lock nut, sold individually under reference 90231-KCS-651; match the specified assembly and service location.View part

Use the reference with a parts diagram

This genuine Honda nut is sold under reference 90231-KCS-651. The documented supersessions include 90231-200-010, 90231-028-000, 90231-030-000, 90231-703-000, 90231-KCS-920, 90232-700-000 and 90231-200-000. Match the required reference and service location to the fitted assembly before ordering.

Keep quantity and tooling distinct

The nut is sold individually. Count the hardware required for the identified repair rather than treating the general quantity note as an exact engine-wide requirement. Check the tool’s engagement profile separately; the 16 mm description is not a complete thread or tooling specification.

Buying questions

Is this genuine Honda or a replica nut?

It is a genuine Honda part sold individually as 90231-KCS-651. Match the original or superseded reference to the identified assembly, then order the quantity required for that repair.

Can I choose it just because the old nut measures 16 mm?

No. Match the part reference and assembly as well as the visible dimensions. The nominal 16 mm description does not provide a complete thread specification or establish the locking nut’s engagement profile.

Does the catalog confirm its exact location on my engine?

It names clutch-basket and oil-filter-rotor uses across compatible applications. Confirm the location in the appropriate parts diagram or service information, especially if the engine or internal assembly has been changed.

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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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