I opened the cover for the clutch cylinder and noticed that the fluid is dark/dirty looking. Is that common or should I drain out the fluid and pour in new fluid?

Thanks

 

If you never changed it, then change it now. Buy one of those "speed bleader" check valve tools, and just pump a clean fluid through. just be careful not to let the level drop too much in the resovoir, or else your gonna have to hassle with air in the line

 

Suck out the old with a turkey baster and wipe out all the greenish black gunk. Fill with new fluid and bleed. Just open the bleeder and add fluid as it goes down- don't pump it.