Fork Oil Seals

The fork oil seal allows a fine film of oil to lubricate the fork sliding surface.

The oil film is more visible after continuous high-speed compression and rebound movement.
Due to greater lubrication needs, larger forks have a greater amount of oil film than smaller forks.

Check Oil Leak

Observe oil ring.
Wipe fork clean.
Ride motorcycle over bumpy road or complete six braking events.
See Unresolved graphic link. Check fork slider tube for oil.
1. If a normal oil/dust film (1, 2) is present, there is no leak.
2. If an oil run or drip (3) is present, perform procedure two or three more times to confirm oil leak.