I hope this is the right section: I just bought a 2007 WR450 and I'll be doing AIS, intake mod just as soon as I get the parts. However, my question is what is the stock main and pilot jets? The manual I got off the net states main: 162 and pilot: 45, however the guide from RMATV states main:150 and pilot: 70. Perhaps it is not necessary to know as I will be chaining them out when I get the AIS kit but I wonder if the jets with the AIS kit are the right ones for my riding area. I ride at ~4k-9,10k and wonder if the JD jetting kit will be a better choice. Sorry for all the questions intertwined but I just wanted to do all my research. Thanks everyone. Stock is 162 MJ and 45 pilot. I ride the same bike and year and elevation as you. I tried a bigger pilot 48 and had issues, too rich. I run a 160mj and 45 pilot and 50 leak jet with air box mod and a Lexx pipe. Seems about right. I replaced the stock needle with a NCVS 3rd clip and the mid is better then stock needle. Buy at boats.net for 10.00. I would also check the valves after the season, mine were off by one size. I adjusted, the bike was fairly easy to start before but know that the valves are in total spec it lights up in a half second on the magic button. Also make sure to get an after market brass fuel screw, well worth it. I like the merge racing one.