Okay so I was out on my 2005 yz450f yesterday with my buddy and his cousin came out on a quad & while going down a steep hill she rear ended me & my handle bars nearly went inside my thigh & missed my sack by like 2 inches. She was okay & her quad was fine & so was I for the most part & I thought my bike was okay as well. Upon starting it back up it backfired like crazy all the way back to my truck & so now it won't idle at all. It idles fine with the choke on & I even tried messing with the idle knob on the side of the carb (the big black knob) & this did almost nothing either way I went. The bike almost died instantly with the choke off almost like a kill switch. The idle knob adjusted fine while the choke was on but I'm not gonna ride around with ma dam choke on.. I know it's not a clogged jet because it's a 2 month old jet & I was running fresh gas & the bike was taken out both days prior to wrecking. What's the deal?