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1971 Honda CB350K3 Oil Filter Rotor Nut

Identify the centrifugal oil-filter rotor retaining nut before ordering for your 1971 CB350K3. This genuine Honda 16 mm lock nut is sold individually, with the original 90231-200-010 reference in its replacement list. Match the assembly location and check any previous engine changes.

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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 CB350K3 · Oil Filter Rotor Nut Buying guide

Identify the rotor fastener before buying the nut

The important checks are the nut’s location and replacement reference. Use the centrifugal oil-filter rotor diagram to confirm the job, and keep its retaining hardware separate from the alternator rotor and clutch components.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Genuine Honda Oil Filter Rotor NutGenuine Honda 16 mm lock nut, sold each; replacement reference includes 90231-200-010.View part

Use the replacement reference for identification

The genuine Honda replacement is 90231-KCS-651, and its stated replacement list includes 90231-200-010. Use that relationship alongside the oil-filter rotor location when identifying the part. An engine assembled from different components needs checking against the hardware actually fitted.

Inspect the associated hardware separately

The lock nut is sold each. Check the condition of the rotor’s washer and nearby components during the same inspection, using the parts diagram to identify any additional needs. Follow the service manual for assembly order and tightening rather than treating the nut as a generic fastener.

Buying questions

Is this a set of nuts for the engine?

No. The genuine Honda lock nut is sold individually. Identify the centrifugal oil-filter rotor position and order the required replacement nut, checking other hardware separately rather than assuming a mixed fastener set.

Does 16 mm describe the tool drive size?

The product is identified as a 16 mm lock nut. Do not use that label to select a socket; check the nut’s engagement pattern and the service-tool requirements for the centrifugal oil-filter rotor.

How do I check it against an older part number?

The replacement list includes original reference 90231-200-010. Compare that reference and the rotor assembly location with your parts diagram, particularly if the engine’s previous repairs or component changes are unknown.

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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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