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1969 Honda CB350K1 Oil Filter Rotor Lock Nut

The hardware choice here is a genuine Honda 16 mm lock nut for the specified oil-filter-rotor application. Check its location in the CB350K1 parts information and compare the removed hardware before ordering, particularly if the engine’s earlier repair history is unclear.

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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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1969 Honda CB350K1 · Rotor Lock Nut Buying guide

Identify the retaining nut at the oil-filter rotor

This individually supplied nut carries Honda reference 90231-KCS-651. Select it by the assembly and part reference, keeping oil-filter-rotor hardware separate from the clutch-center retaining parts.

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 Honda lock nut, reference 90231-KCS-651, sold individually for the specified assembly.View part

Use the actual assembly to identify the part

Honda’s CB350 workshop information identifies a 16 mm lock nut at the centrifugal oil-filter rotor. Keep that service location clear when ordering replacement retaining hardware. An engine or assembly change calls for checking the relevant parts information again before assuming the same nut applies.

Plan the retaining hardware with the service

This genuine Honda part is sold individually. Inspect the existing nut and the related retaining arrangement while planning the repair, then use the correct workshop information for the tool, locking details and tightening procedure. The nut’s size alone is not a fitting or torque instruction.

Oil Filter Rotor Lock Nut questions

Is this lock nut sold individually?

Yes. It is supplied as one genuine Honda lock nut. Order the quantity required for the identified assembly rather than assuming a multi-piece hardware set or a full engine’s retaining hardware is included.

Should I use it as the CB350K1 clutch-center nut?

The CB350 clutch center uses a circlip, while the oil-filter rotor uses a 16 mm lock nut. Confirm the exact assembly and part reference before ordering.

Is the 16 mm size enough to identify a replacement?

No. Match the part reference and assembly location as well. This is Honda reference 90231-KCS-651 with listed supersessions, and the correct choice still depends on the engine and components installed in the motorcycle.

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