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At the base of your motorbike damper's body is a hard metal cover around the main shock shaft - this end cap seals the area out to the cylinder bore of the shock body. It isn't actually sealing the shock absorber pressure in - there is an oil seal head assembly behind it - but it protects that delicate seal case from rock strikes & corrosive mud build up plus transfers the force of bottoming out on hard landings.
Your bump stop thumps pretty hard, so check regularly for cracks or deformation of the cap, especially if you're racing hard offroad or have reduced suspension travel from shock lowering spacers - because they are hidden away these bottom covers often get neglected, leading to bigger rebuilds later.
At the base of your motorbike damper's body is a hard metal cover around the main shock shaft - this end cap seals the area out to the cylinder bore of the shock body. It isn't actually sealing the shock absorber pressure in - there is an oil seal head assembly behind it - but it protects that delicate seal case from rock strikes & corrosive mud build up plus transfers the force of bottoming out on hard landings.
Your bump stop thumps pretty hard, so check regularly for cracks or deformation of the cap, especially if you're racing hard offroad or have reduced suspension travel from shock lowering spacers - because they are hidden away these bottom covers often get neglected, leading to bigger rebuilds later.
These solid lower stopper caps helps reinforce shock bodies too, allowing for thinner casting walls and better heat transfer. Your shock absorber gets much hotter than you'd think - watch our WR250R Shock rebuild video to find out - so anything that helps cool a shock gives more consistent damping and a better predictable ride.
We offer OEM Kayaba suspension parts for most KYB factory motorcycle rear coilovers - have a look in our special shock tools section to help you service yours.
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