uneven chain tightness

[keratos]

No, the only thing that is likely to will fall out is a load of crud which is thrown off by the chain and is stuck inside the cover.

Cover is only to protect us from the rotating bits and the operating mechanism for the clutch.

Any oil in there is from the lubrication used for the chain unless there is an oil leak from the sprocket seal, the clutch pushrod seal or a broken crankcase  :lol

cheers pal; I am doing a chain+sprocket kit fit in a few weeks. I'm also bought the upgraded nut+new lock washer for the front as per yamaha service bulletin. probably dont need it but it was cheap enough for peace of mind. thanks pal