Originally Posted by 2door
Don't put any holes in those covers. They keep dirt and moisture out of critical moving parts. There is absolutely no cooling benefit.
I'm not sure where you saw pictures of the covers with holes but they were not on the bikes built by experienced builders.
uhhh, i put some holes in my clutch cover. a few small ones drilled on the side in the front and rear, hoping to cool down my clutch by passing airflow through it.
i dunno if it helped.
BUT the bike is totally modified and the stock clutch pucks don't work with the power, and after trying every adjustment, etc i could think of, i drilled the holes.
now i'm just gonna get some real friction material for the pucks.