My Chinese 50cc dead-sticked after 10 months of great flights. After landing, no compression, front bearing losing grease and very clanky at TDC…It was within warranty, and the dealer said he would be happy to look at it for me…After tearing it down, he found some bearings were shot and the hole in the con rod for the wristpin bearing was a little out-of-round…Even though the piston/cylinder was in good condition, he gave me a short block assembly, reused my carb and muffler, converted to RCexl ignition w/ BPMR6A plug, test-ran it, and priority-mailed it back to me…He doesn’t even carry that line of engine any more (XYZ)…That’s my story about Ron Nesler at http://www.southeastrcengines.com/…He’s a stand up guy, great email communicator, and goes way above and beyond the call of duty for customer service…Ken