I have RTK 827 kit with 250 miles on it. yesterday it seized. I rode it aroung the neighborhood earier that day and it has always ran great. My plugs have always looked great. I let it warm up for about 5 minutes then went around the parking lot a few times. It had been ran for at least 10 minutes. I know it was warmed up and it sounded great and everything seemed fine. Then I started up the trail and made it 20 minutes and it locked up. I took it home and opened it up. It looked like a cold seize. The piston and rings were melted together and the cylinder is scared pretty bad too. The damage was only on the intake and exaust sides of the piston. There is no signs of air leaks. I am running the jetting Kelsey at RKT told me to put in. I was riding at cub river were Kelsey rides all the time so he knows were to jet them. I am bummed out. If it is a cold seize then why did one side go down hard and the other look perfect. Any ideas? Thanks guys.