OMG! Dude, that was definately his fucking arm being blown off. Look when he jumps away from the bike. Where is the black glove and hand on his left arm? Exactly, on the track. Gewwww!

 

Through the grapvine I heard that it was actully a nitrus backfire that ripped through the plastics and was not really a piston as a piston would go through the bottom or the side of the block not through the head, valves, cam, and covers. Also I beleive his hand is fine and that was plasics on the ground.

 

I'm with Rales on this one. No way a piston is coming thru the head. And it definitely looks like a notrous backfire. I slowed the video down and you can see his left hand (white gloves with black stripes) clearly on his arm when he ran off the bike. Sorry to burst you guys bubble.

 

either way. not fun