hello, ive been struggling with the clutch cable not sliding properly. i cant pull the clutch in to engage a gear and have it snap back like it used to. i drained the oil about 6 weeks ago when i took the motor out of the frame and i just refilled it 3 days ago. ive read several old threads but i still cant get it working and im getting pretty frustrated. i have the cable off the bike now and i cant slide the cable by hand. is this cable no longer good?