First off, I do know how to search and have been reading a lot of posts on the matter. My problem is that I live in Mexico and can't run to the local Yami dealer if I don't have the right part. I'm heading to the states next week and need to order parts asap so that they are at my parents house when I get there. BTW- I just bought a '06 YZ450 today which I'll pick up at the same time. Ok, so I'm switching from an 04 WR450 to an 06 YZ450. First question, will the JD jet kit (jets and needles) I have for my WR work with my YZ? If so I could put the stock needle back in my WR and use it for the YZ. Or is there a better needle because I read about a (shoot what was it) NFLR or NLFR something like that? What are the stock jets 160 mn 42 pj? So to make sure I have everything I need to play around with the jetting...what all do you recommend for my scenario? I live in Mazatlan, Mexico which is sea level + 5 feet (as I'm staring at the ocean as I type this). The winter is around 60-80 with moderate humidity and the summers are around 90 with high humidity (I try to do more riding in the winter and more surfing in the summer 'cuz it is sticky!!! SO what all jets do you recommend just to be safe and what else such as needles? I have some jets from my WR if they fit. Thanks!