Fork oil needs to be changed more frequently than you probably think. For my full write up visit https://ulteriormoto.com/blogs/how-to-replace-fork-oil-and-springs
After pouring out your old oil you will definitely understand why. As the spring scrapes against the tube it creates particles of steel which contaminate your oil. It is surprisingly easy to change the oil yourself with just a few inexpensive fork service tools and some knowledge. In this video, I demonstrate the process step by step on 2005 Suzuki GSX-R 600 and 750 forks. Bear in mind, not all forks are the same.
Be sure to check out @CatalystReactionSBW for an incredible wealth of motorcycle suspension knowledge.
0:00 Intro
1:28 Remove Fork Cap
3:18 Initial Fluid Drain
4:00 Compress Spring
5:55 Remove Rebound Rod
7:48 Disassembly
9:07 Final Fluid Drain
10:40 Cleaning Components
17:00 Initial Reassembly
17:34 Fill Oil
19:52 Purging Air from Rebound Rod
22:07 Measuring Oil Height
23:50 Reassembly