Not a bad deal!
http://www.ebay.com/itm/Yamaha-Banshee-Rear-Marvin-Shock-14-5-15-in-/330872143440?pt=Motors_ATV_Parts_Accessories&hash=item4d09843e50&vxp=mtr
You wont see the immediate effects of not running the cooler, but im willing to bet that if and when you have to dig into your motor again you will probably be snapping off some bolts, made brittle by excessive heat. ;)