Clutch fluid is really nasty looking Rust and sludge in bottom of reservoir I plan to flush it and bleed it with new DOT4 fluid...can the crappy clutch fluid make the clutch act good sometime and crappy others? I know this is a dumb question. I bought the Bike used. the clutch engages at the end of handle release. ans sometimes will grind 2/3rd upshift or down.don't seem to be slipping maybe a little in high gear. I dont have a vac but hope to bleed it like a old brake system and make sure it dont get low during bleeding.