A few days ago, I DROVE my recon into the shop to simply replace the head gasket and repair the boot intake take off the carburetor. I got both of those fixed within two days and put the head back together. Today, I tried to crank it and instead of sucking air through the air box, the four wheeler blew air out. After an hour so, I discovered that there was a bent valve. Any ideas what could've caused this? Thanks in advance.