Honda motorcycle parts
Choose your model and year to see parts listed for your bike.
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1984 Honda CB125S · Tools and Hardware Buying guide
The Honda lock nut and two clutch-nut tools are separate purchases. Match the fastener location first, then compare tool engagement and driver connection. The related helmet-holder lock belongs to a different repair.
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
24 mm clutch nut tool24 mm inside diameter with a 3/8-inch driver connection.View part
Dual-ended clutch nut tool20 mm and 24 mm ends, used with a 1/2-inch drive extension bar.View part
Related parts: Helmet-holder lock with keys
Genuine Honda nut 90231-KCS-651 is sold each for compatible clutch and oil-filter rotor applications. Identify the nut’s position in your assembly before ordering. The broad application list does not mean this motorcycle uses it at both locations, and its 16 mm description is not the tool engagement size.
The standard tool is described with a 24 mm inside diameter and 3/8-inch drive; the premium version lists 20 mm and 24 mm ends with a 1/2-inch drive connection. Compare engagement with the installed nut as well as your driver. Those measurements do not substitute for assembly identification.
Identify the installed fastener and service location first. If a replacement nut is needed, match its reference; then compare the tool working end and your driver. A matching nominal size alone does not establish both purchases.
These descriptions refer to different measurements. Do not choose the tool by equating those numbers; compare its working end with the actual slotted nut and use the matching service information to confirm engagement.
The related helmet-holder lock comes with keys, but matching it to your existing motorcycle key is not specified. If one-key operation matters, confirm that requirement before ordering the replacement lock.
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