1st ride on my 09 WR450 - I was crying, it was so slow, I could hold the throttle wide open and was going nowhere (weird - cause the dealer did the free mods, but they also sold me the GYTR insert - Yuck). 2nd ride put a 09 YZ header and muff on - Oh Boy!!!! I was crying tears of joy after that death ride. Ever since that day I'm very respectful of the go faster twisty thing on the handlebars. Break-in = Ride it like you stole it for 20miles, change oil, Ride normal. Done!