Hey folks. I subscribed to this forum mainly to get this question answered. I bought an '06 zx10r early this year with 1300 mi on it. The bike was mint. I put about 1500 mi on it since then and just had catastrophic failure. I didn't baby the bike, but never really beat on it either. I pulled away from a traffic stop and going about 40mph I heard a backfire followed by loud pinging and more backfiring. I pulled over immediately. The bike struggled to continue running so I killed the engine. I called my longtime mechanic and he showed up with a trailer soon after. I started the bike so he could hear what it was doing and he suggested valve issues but was amazed with so little miles on the bike. He wasn't an authorized Kawi mech. but his cousin owns a dealership so we brought it there hoping to get some sort of warranty work done. Granted the warranty expired quite a while ago, but the bike had so few miles on it we gave it a shot. After breaking the bike down, we found one of the spring retainers had failed dropping the valve and allowing it to hit the piston. There was no damage to the piston or cylinder, but we could see another retainer on a seperate cylinder ready to fail as well. I've seen no other posts anywhere that have suggested this is a common issue; however, Kawasaki seems to know about it since the part has been updated. I've had zero help from customer service. I've always had GSXRs and CBRs in the past with no serious issues. Is this a fluke or should I ditch this P.O.S. and go back to Honda/Suzuki? By the way, my bill was $2,500 and Kawi didn't help with the cost of parts at all. Also, do I need to fear new issues with having had the motor apart? The guys doing the work seem very knowledgable. Thanks!