Motorcycle fork leaking oil: dirty or worn fork seal
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Applies to: All conventional and USD forks (All brands, Yamaha, Kawasaki), All years
Symptoms
- Oil ring on the fork tube
- Oil on the brake caliper
- Soft or bouncy front end
Why it happens
Dirt gets under the seal lip and lets oil past. A nicked or pitted fork tube ruins new seals.
How to fix it
- Clean under the seal lip with a seal cleaning tool; this sometimes stops it.
- Check the fork tube for nicks or pitting.
- Replace fork seals and dust wipers.
- Refill fork oil to the manual's level and weight.
Tools and parts
- Seal cleaning tool
- Fork seal driver
- Fork seals and wipers
- Fork oil
What the factory service manual covers
Front fork: disassembly, oil level and weight. The full procedure, specs and wiring diagrams are in the factory service manual for your machine.