My 2002 ZR500 CCE went down yesterday. Younger brother and I were out hitting the trails to celebrate my 40th Birthday. I was on my F7 and my brother was on my wife's '02 500. I was stopped at a trail marker and he came up to me and it sounded like his sled was running on one cylinder. We stopped at a watering hole and I decided to pull the plugs. The left one looked great and the right one actually had a piece of metal stuck near the gap. Clearly the right cylinder went down. Got it on the trailer and called it a day. What are the costs associated with this fix and who has done this before? Is it something that is preventable in the future? I have read about shim spacers for the apv valves. I tried a search on this site but it came out pretty weak. Any help is appreciated.