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1985 Honda CB125S Service Fasteners

Replacing a worn lock nut starts with identifying the assembly it belongs to. This 1985 Honda CB125S route contains a 16 mm nut described for clutch and oil-filter rotor applications. Compare the reference and location, then determine any accompanying parts separately.

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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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1985 Honda CB125S · Service Fasteners Buying guide

Identify the nut by its service location

Genuine Honda reference 90231-KCS-651 identifies the individually supplied 16 mm lock nut. Use the engine assembly and service location to confirm the purchase, especially if a replacement clutch or engine has been fitted.

Parts to consider

Honda CB 16mm Clutch / Oil Filter Rotor Lock Nut ~ Genuine Honda 90231-KCS-651 ~ Replaces 90231-KCS-651 Clutch or oil-filter rotor lock nutA 16 mm lock nut sold individually. Genuine Honda reference 90231-KCS-651.View part

Distinguish supply from requirement

One ordered unit supplies one lock nut. The product describes a commonly required quantity, which is not a model-specific inventory of your assembly. Use the relevant diagram to establish the nut count and any separate washers or locking components needed for your repair.

Check an altered engine carefully

A changed engine or clutch can alter the hardware required. Record the installed assembly and compare its parts reference before ordering. The replacement-number list identifies the offered nut’s applications; it does not establish which accompanying washers, locking parts or service tools your particular assembly needs.

Questions before ordering

Is this lock nut sold individually?

Yes. The current product description specifies each, meaning one nut per ordered unit. Determine the number needed from the particular assembly you are servicing, along with any separate washers or other associated hardware.

What does “commonly one” mean for a larger service order?

It is general application guidance, not a count for every location in this CB125S engine. The nut is sold each. Establish the required locations and quantity from the installed assembly before ordering additional pieces.

Does the 16 mm size specify the service-tool drive?

No. The nut nominal size and the service tool drive are different specifications. Compare the required tool engagement and drive equipment with the applicable service instructions before choosing a tool or attempting the repair.

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