My sons 99 Banshee is blowing the small rad hose that runs to the top right side of the radiator. The bike has been running fine. but after awhile the hose will pop off or burst spewing the coolant. Why am i getting a high pressure here? what is the problem? suggestions and ideas welcome.

 

Could be a bad radiator cap not venting excess pressure,or the plastic water pump vanes are shot,and its overheating. does it spew any coolant out the overflow before this happens? if not, then I would look at the cap.