We have found the Timbersled vent kit :
http://www.timbersled.com/VentingKits.htm
along with a vented Headlite Elimintaion kit has been the key to resolving this. Clutches stay cool to the touch & you can actually grab the belt, even in deep powder & really getting after it.....
BDX has one available now I believe....
http://bd-xtreme.com/pro-liteseriesheadlighteliminationnon-vented-1.aspx
We tried other things in the past, however this seems to take car of the problem.
I assume it keeps the powder out?? The mesh looks pretty big in the picture. I have always run a florite in the shock tower, but this definately looks like more air!!