A leaky fork seal can range from barely noticeable to a puddle on the ground when the bike is parked. A loss of fork oil will, at best, degrade the damping performance and cause a failed safety inspection. At worst, the fork oil can coat the front brake disc and tire leading to an unsafe motorcycle.
Replacing fork seals is a common job that has been with us for as many decades as the damping rod fork. All damping rod forks are essentially serviced the same way. The service becomes less straight forward when the level of suspension technology is more advanced.
For more tech tips on fork service, click here.
Link: Cyclepedia
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