Hi lariseos,
I'm assuming that you are talking about keeping the bike cool yes?
Buy the fan kit that bolts onto your bike, this will keep the bike from boiling over. I have not heard of anyone who has boiled their bike over after installing this fan kit.
Next, use a good header wrap like DEI titanium header wrap
http://www.designengineering.com/catego ... technology to help keep the heat out of the gas tank.
DEI also makes this material
http://www.designengineering.com/catego ... flect-gold to put onto your gas tank to help keep the heat out of it as well.
CV4 also makes this tank blanket
http://www.cvproducts.com/Powersports/P ... =Fuel+Kool
If you are not running the Husaberg hard parts aluminum gas cap, and are still running the stock plastic cap, disassemble the cap and remove the little ball check valve to keep pressure from building up inside the thank.
On my 09 FE570 I just run the DEI header titanium header wrap, and the factory fan kit. I do plan on putting on some of the DEI stick on barrier.
In some extreme cases I have boiled the fuel a little on my bike but most of the time it is not an issue. I ride in conditions ranging from -8C to 40C. Last summer I did a bunch of very tight technical riding, 1st and 2cnd gear mainly, at high elevation (3000 meters +) at 25 to 29C and the fan never had a problem keeping the bike from boiling over, in fact it would cycle on and off. The fuel did percolate once I was parked on the side of the trail, but as long as I kept moving it was fine.