So when I cleaned my carb yesterday i managed to bend the needle, which is apparently made of cheese, btw..., and ordered a new one. When I was on ordering stuff, i noticed there were six or seven different ones, with no explanation of the differences. I ordered the standard one, but should I have? can someone demystify this? http://www.bikebandit.com/houseofmotorcycles/2005-yamaha-wr450f-wr450ft/o/m145334#sch521169 part number 13; DUP-K, DUR-K, etc.