whats the part anyway? also on a lot of yamaha parts the last 2 sets of numbers are like option numbers like color, how many teeth some gears have and are sometimes just left 00-00 as a default. the set of four numbers or letters tell what the part is exactly. either it's a numerical code or the part is spelled out in english. on very few things the first two digits of this number are the year the part was made. Parts that are the same but have changed appaerance regularly have this number and an abreiviation of the part after it in leters. some parts can be back oredered with this info. also the first three numbers of the set of four will be the first three digits of the vin # only if the firts three part numbers are something else, the vin #'s will be followed by a 2 number catagory code. the first three set of numbers are like a family catagory, really general, sled fourwheeler, sled accesory, clothing, general parts. a few years ago Yamaha re- sorted their part numbers. many of the older numbers before 01 i beleive will not work. you'll either have to go yamaha's web site or your dealer and tell the the name of the part you need. this is may not be alot of use to you, but i have not seen anyone else write about this so i thought i'd get it out. hardware like nuts and bolts odnt have regular part #'s either ie: 12345-67890-00