So I've got a few tanks through the beast. Time to start thinking about regular maintenance. Is there something in the clutch area I should be oiling? I just noticed today that when the clutch is disengaged, the rear wheel doesn't spin as freely as before. The difference is subtle, but it's there. You can hear a slight grinding coming from inside the "driveshaft" (not sure if that's the proper term... the part in-between the gear and the clutch. I know it's not the clutch not disengaging properly-- I took the cover off and the grinding is coming from inside. I am waiting for the thing to cool down so I can pull out the plug and look further, but I don't really know what I'm looking for. Any advice?