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1978 Honda CB750K Clutch Lock-Nut Hardware

This route contains one Honda lock-nut listing, described as 16mm and sold each. Its application list spans several motorcycles and assembly types. Identify the nut in the parts information for your actual engine before ordering it as replacement clutch hardware.

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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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1978 Honda CB750K · Fasteners & Hardware Buying guide

Order the nut by reference and assembly location

The listing names Honda reference 90231-KCS-651 and includes the CB750K application. Use that reference with the installed assembly, especially if the engine or clutch was replaced during the motorcycle’s history.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Honda 16mm lock nutSold individually; the listing identifies Honda reference 90231-KCS-651 and advises checking the part number and assembly location.View part

Keep the broad application separate from your repair

The description mentions clutch-basket and oil-filter-rotor uses across its broad Honda fitment list. That does not establish both locations on your particular motorcycle. Confirm the required reference and location in the relevant parts information before selecting this nut for the job.

Count the hardware actually needed

The item is sold each, and the listing says commonly one is required where used. Use the assembly’s parts information to establish your quantity. The description does not provide a complete thread specification, so avoid matching a replacement solely from the stated 16mm label.

Buying questions

Is this a clutch-nut removal tool?

It is replacement hardware, not the service socket used to remove a nut. Check the appropriate tool listing separately if the repair requires one, and confirm that its working end matches the installed nut.

Does one order include a set of nuts?

The listing states sold each. One item is an individual lock nut, not an engine or clutch hardware set. Determine the quantity needed from the assembly being serviced before placing the order.

Does 16mm provide all the dimensions needed to identify it?

The listing uses the 16mm description but does not provide a complete thread specification. Match the Honda reference and assembly location. Do not infer pitch, wrench engagement or universal interchange from that dimension alone.

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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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