I recently rejeted on my 450x 05. 170 mj 55 leak, stock pilot, and ncvs needle. Over the weekend when racing my friend on a dirt road im going fast already I pinned it and it started missing. I backed off throttle slightly and it accelerated. What needs to be adjusted? Fuel mixture ,too big main.I have a r cam 05. aftermarket can, and air box is opened. Temp was 75 to 80 deg sunny lower humidity. This was the first chance I had to really open up the bike since rejetting.When I backed off throttle slightly it ran very strong pulling hard.