1-those leaks typically heat-related in conjunction with a motor that has spent alot of time at or near red-line.
2-an inoperative cooling fan or an ecm that has been dicked with and fan logic set to something stupid like minimal or no run-time
3-a cooling fan saturated with rear cylinder oil that now refuses to operate and the motor runs ever hotter
4-like most everything else extremely challenging to fix by yourself if you've never worked on an XB model buell. involves engine rotation, dismantling, parts replacement.....it's not for novices.
5-James "top-end" gasket repair kit part # JGI-17049-07-X contains all you'd need and circumvents having to go thru the dealer pipeline. James top quality and complete kits.