Getting ready to put a new top-end on my 250xc...what is the proper way or tips that you suggest cleaning the powervalve? This is the only thing that I do not have experience doing so I want to get some inside info before I go ahead. Q-tips and a can of brake cleaner? Or do I need to disassemble everything? thanks ahead as I learn the fine art of 2-stroke maintanence coming from a yz 4t.