I have had my 300 xplorer for at least 4-5 years now and I love it. This past summer I went out and got a 2004.5 sportsman 500HO loved the independent suspension but kind of missed my old 2 stroke so I sold it again. The quad is in great shape but the motor was getting low on compression so I am in the process of doing a complete rebuild. I am using a Wiseco Piston, Hot Rods connecting rod, and of course all new bearing seals and gaskets. I don't think there's any power to be made extra with them but I am planing on adding a pipe and jet kit plus ???. The problem is I don't see alot for them AAEN has some and just found RCR (ricks cycle racing) but mostly for the 250cc and 400cc very little for mine. On top of that there's not alot of them around here so none with mods to compare I just trail ride it and plow snow any ideas what parts I should use?