Alright guys, i have 2 07 yfz and im getting ready to go to sand mountain, nevada, Im hearing mixed responses where i live about running the stock needle, or getting the bike needle . i already have them both jetted, one w/ a dynojet needle and one w/ stock. im also hearing that the jetting can be the same at different altitudes if the air density is right ????? what do you guys think,,,,thanx for the help