I'm going to be replacing the left side engine cover on my R6. Is there any trick to it? The Yamaha parts CD does not indicate that there is a gasket to go with the cover. Should I use some silicone and some other gasket sealant? Does the manual call for torque specs? I'm surprised that there is no gasket as I'm sure there is oil beind the cover. Do I need to drain the oil? Thanks guys!