Motorbike Coilover Shocks Main Shaft Sealing Head Washer

Motorbike shocks use a damping shaft that slides inside the main shock absorber body. To keep all the oil and nitrogen pressure inside the damper there is a lower seal head assembly between the two.

Rear dampers have multiple lines of defence in there - an oil seal deep inside, a dust wiper on the outside, a shaft bush to keep it all sliding concentrically, a rubber o-ring sealing around the outside and a rebound top out bumper facing inwards. That bump stop can either be a rubber ring or a small steel coil spring, and it's job is to make sure no damage happens if the shock piston bumps into the bottom casing (like when you jump the bike).

The shock lower body has a sealing head that acts as an oil lock, and a metal guide disc inside keeps all the flexible rubber seals and rod bushing held in the right place, concentric around the damping rod. We have genuine factory KYB and Showa spacer holding shims.

To service the coilover end case you will need to remove the shock spring, so read our article on how to do it safely. It's a perfect opportunity to swap springs to the right spring rate for your weight too. And once everything is rebuilt, keep in mind our suspension fluids section to refill the oil, and our regassing tools to gas it up.

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Motorbike shocks use a damping shaft that slides inside the main shock absorber body. To keep all the oil and nitrogen pressure inside the damper there is a lower seal head assembly between the two.

Rear dampers have multiple lines of defence in there - an oil seal deep inside, a dust wiper on the outside, a shaft bush to keep it all sliding concentrically, a rubber o-ring sealing around the outside and a rebound top out bumper facing inwards. That bump stop can either be a rubber ring or a small steel coil spring, and it's job is to make sure no damage happens if the shock piston bumps into the bottom casing (like when you jump the bike).

The shock lower body has a sealing head that acts as an oil lock, and a metal guide disc inside keeps all the flexible rubber seals and rod bushing held in the right place, concentric around the damping rod. We have genuine factory KYB and Showa spacer holding shims.

To service the coilover end case you will need to remove the shock spring, so read our article on how to do it safely. It's a perfect opportunity to swap springs to the right spring rate for your weight too. And once everything is rebuilt, keep in mind our suspension fluids section to refill the oil, and our regassing tools to gas it up.