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1984 Honda CB125S Lock Nut Hardware

The hardware choice here is a Honda slotted lock nut, described as 16 mm and supplied individually. Before ordering it for your 1984 Honda CB125S, identify the nut on the assembly being serviced and compare the replacement reference with your parts information.

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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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1984 Honda CB125S · Lock Nut Hardware Buying guide

Identify the slotted nut before replacing it

A small locking fastener needs more than a visual resemblance. Match its reference and position in the assembly, then check the separate tool needed to engage the slots without assuming that nominal sizes describe the same measurement.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Honda 16 mm rotor and clutch lock nutGenuine Honda lock nut 90231-KCS-651, sold individually. Confirm the assembly location and reference before choosing this slotted replacement.View part

Use the reference with the assembly drawing

Genuine Honda nut 90231-KCS-651 is individually supplied and has several listed earlier replacement references. Locate the nut in the assembly you are servicing before choosing it, especially on a replaced engine or clutch. Keep the required service position clear when comparing those references.

Plan the tool and replacement separately

A slotted nut and its service tool are separate purchases. Compare the tool’s engagement dimensions with the installed fastener, and check whether your driver has the required connection. Use the matching Honda procedure for service details; the product size is not a tightening specification.

Common buying questions

How should I calculate the lock-nut order quantity?

Each purchased item supplies one nut. Identify the positions your repair will renew and count those separately; the product’s broad “commonly one” note is not a complete bill of parts for every listed motorcycle.

Does the 16 mm description tell me which tool drive to use?

No. The nut’s nominal size and a tool’s drive connection describe different features. Match the tool’s working end to the slotted fastener, then check the drive size needed for your own equipment.

Can I choose this nut for an assembly changed by a previous owner?

Identify that assembly and its fastener reference first. The motorcycle application does not establish the hardware in a substituted clutch or engine, so resolve a mismatch before relying on the original frame year.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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