I have a 220 bayou that we put new rings and gaskets in the top end . I rode it for about 2 hours and when i went to start it again it was locked up. Let it set for about two years and decided to tear it apart and all it was is the timing chain. Put it back together and it has no compression so i tore it back down thinking i was 180 degrees off but i wasnt. What else could make it lose compression?