I purchased a "blown up" 09 RMK 800 cheap. The previous owner said the engine went down on a cold morning, after a short warm up. Had the motor rebuilt by the local dealer, only to have it go down again within 200 miles. Said it was warmed up proper the 2nd time, but the same cylinder scored piston on the exhaust side again. I am new to these newer engines, have built numerous pre 05 Polaris engines, with no trouble. Just wondering if anyone here can give me a couple of pointers of what to look for and things to do in particular for this engine. I see a ton of "fix it" kits available, are any better than the others. Any other things to do while it is apart as well. Any and all help is greatly appreciated. Thanks in advance.