I'm a believer in not fixing something that's not broken. There's been much discussion of replacing fork oil here, but I just wonder if it's really necessary unless there's a leaking seal. I modified the front forks just after getting my 650 new using Recetech springs and cartridge emulators with 15 wt. oil. I now have 15,000 mi. on the bike and don't see any reason to change the fork oil. Repairs like this always involve some risk like scratching the shock tubes. Unless there's another reason to tear down the forks, why replace the oil?