Stainless Steel Shim
Fitment - Aprilia motorcycle range
The shim is a small disk that sits under the valve bucket and acts as a spacer.
There is supposed to be a set amount of space between the bottom of the cam and the top of the valve bucket but as the valves wear out over time, the clearance changes and a different shim needs to be placed under the bucket to keep the correct amount of clearance.
If there is too much or too little valve clearance, it can result in poor performance or a rough idle because the engine can't breathe normally and operate at peak efficiency. Too much clearance means the valves will likely clatter and, over the long term, cause damage to the valves, camshaft lobes or rocker arms
Shims are available on request and if you know the size you need please get in touch.