Fork seal replacement. How to replace the fork seals on a motocross bike. This is Part 1 of our 2 Part video which covers the disassembly of the fork. Part 2 covers the reassembly of the fork and adding the correct measurement of oil into each fork leg. This instructional video of the rebuild of the Cartridge type fork which is commonly seen on late model dirt bikes. Replacing your leaking fork seals is easy and we'll show you how to do it! Get all the parts and tools you need @ www.rockymountainatvmc.com!