A little over three weeks ago I purchased an 03 Wr450, I rode it about 11 miles, went to go kick it when it back fired ripped a hole in my leg and the right side crank case and the outer primary case. Ok, no big deal its under warranty, bring it to the dealer to fix. 2 weeks later its ready, assured that it was properly "tuned" by the service manager. I took the bike filled it up with gas, warmed it up and rode for about a mile, just bursting around a little. I was standing on the pegs and I heard a noise from the right side of the engine, looked down heard the bike backfire and watch the kicker go forward rip a chunk of plastic out of the gas tank and snap off and hit the ground. I looked a little closer at the engine and sure enough the outer primary cracked. Should I keep this bike?