Motorcycle Fork Top Caps

If your motorbike has modern "Separate Function Forks", you probably have a comp adjustment clicker on one top cap & reb on the other, but for many adjustable designs both caps have compression damping adjusters - learn more about open or closed chamber front forks. If you've never adjusted your dampers, read our clickers article - they're like opening or closing a tap for more or less suspension oil to flow.

Adjuster assemblies are compact but complex, with one of these top caps being the only part you can see outside. These units come pre-assembled with all internal parts.
They are sealed around the upper fork tube with an o-ring, the clicker & an access port on the face. An oil fork port will be an emulsion bleed bolt so you can drain out any frothy mess, or if your bike has air forks it will be a Schrader (tyre) valve so you can hand pump them to the right pressure.

A centre shaft is screwed underneath with a free piston sliding up & down it, with inner & outer seals plus bushes to prevent oil getting past. An Inner Chamber Spring presses between the top cap & this floating piston - helping set the initial fork plushness - so changing how strong the ICS is will make the forks feel softer or firmer at the beginning of the stroke.

At the end of the center rod are the comp valving piston parts - a specific set of shims & washers assembled either side of a piston and locked onto a base valve "tower" with a locknut. A pushrod slides inside the centre shaft, pressing harder or softer on the valves depending on your clicker adjustments, compressing or loosening the stack.

If you can't find what you are after, we have a collection of small clicker parts in our Fork Adjuster Parts category - plus we have some great aftermarket parts for comp assemblies like clicker knobs and super strong billet alloy free pistons.