I just purchased a larger jet for my CRF 450R, I went from a 175 to a 178 for the colder weather. I just went to my dealer and asked for a keihin 178 jet... now it has the same stampings in the same location as the stock jet, but a 178. I now read that CRF jets are numbered differant? Is this true? The jet went in fine and runs great, just confused how the numbering can be differant. Any help is very appreciated.