I've had this issue since I got the bike. The plates are flat, no grooving in the clutch basket, changed oil, checked clutch lifter mechanism, but still the clutch plates seem to stick together. If the bike is in gear and I pull the clutch, I still can't roll the bike. What's going on? The only thing I can think of is that the fluid in there keeps the friction disks and the metal disks somewhat stuck together. My Honda service manual says to use SAE 10W-40 or equivalent, which I've used, and before that I believe gear oil was in it. Should I use a thinner oil like ATF, and maybe the plates will spin freely when no clutch pressure is applied?