350twin24

Hey guys and Gals I just bought a 2002 banshee and I noticed that sometimes when i start it, it will run great and then Ill let it sit for like 2-3 days and it will foul the plugs out really easy. Also it seems that sometimes it is getting starved for fuel. Because it will start and then if i rev it up it will run and then i let off and it will die. I am new to 2-strokes so any help would be appriciated. Also it is all bone stock. I also forgot to mention that it is going through spark plugs really quick and i wanna get it figured out.