Im totally sick right now. I feel like I am going to puke. I was just doing the normal routine winter maintainance installing iridium spark plugs. This machine is new to me 2007 and I got it with 1100 miles on it. As far as I know the plugs have never been touched. I was installing the plugs at 8400 miles. #1 and #2 were so seized up I couldnt hardly turn my 1 foot ratchet!! I kept after it by reversing them and working them but finally #2 had enough and twisted off the spark plug threads in the aluminum head. HOLY ****! NOW what do I do? This machine is out of warranty and I sure dont think I can pull the head. Oddly #4 came out just like it should.... I am totally freakin out here. Has anyone here ever heard or seen this problem before? Could this be something (praying) that the factory did? I sure cannot afford a $1000 dealership bill right now. OH THIS SUCKS