My bike still has the factory clutch fluid. I didnt want to change it because in the 10 years I've never once had issues with my master or slave cylinder, like many of you report, and I was worried that if I mess with it, I'm going to have issues. But now it's been 10 years, and I really though I ought to.. The Factory service manual says to use fork oil, but does not state weight. Magura says to never use anything other than their Magura Blood mineral oil. Which do I use? I've never had good luck with Magura Blood in the HyMec systems on my other bikes. On my other bikes, once the slave heats up from engine heat, it thins out the Magura Blood so much that it lets in a tiny amount of air (assuming by the master's piston?) and over time it accumulates to where I have to bleed my clutch probably every 2 months. On my Husky, I've never once needed to bleed the clutch in the 10 years. I don't know if this is attributed to the factory using (thicker?) fork oil, or the slave is just a better design than the HyMec slave on my other bikes. Let me know what you guys run, and if it's fork oil, then what weight?
Just bled mine and used Maxima fork oil 10w, seems to be working fine. Dont have any long term info though
I have used motul mineral oil with good luck. You can use atf or if you really want to save some money, singer sewing machine oil works. Can be bought for $3 at most stores. Personally I’ve never tried fork oil. When back bleeding the slave cylinder, I’ve always found it easiest to disconnect the line where it connects to the the master cylinder until you have no air, then reconnect and continue bleeding. I would always get a spongy feel in the lever unless I did it this way.
