I finally found a cherry 2001 yz 426, brand new clarke tank, frame guards, devol radiator guards and a msr kickstand... No engine mods or pipe.. The previous owner has been running it stock..This bike was hardly used at all.. I want the pipe to stay as quiet as possible, and I need a u.s.f.s. spark arrestor so I can run amuck in the desert... Is there a tip which will let it breathe better and be legal in the forest??? I was going to do a uni filter, a pipe mod as described above and the bk mod to assist in starting...This is a bone stock yz, any other free mods I can do?? Once I get it jetted properly and starting well, I will dual sport it for connecting trails here in AZ.