The other day, we were riding my buddies rm125 around in the field. We had just replaced the piston and rings. After riding it, we let it sit for a few days, as there was a rain storm. Today, we went to start it. As my friend kicked the starter, it made a sound that is different from usual, which is a sort of metal-on-metal sound, and didn't even attempt to start. After kicking it for a few more seconds, not thinking anything was really wrong, the kickstart siezed and would not budge. The only way to get it to move is to put the bike in gear, pull it back as hard as possible, so that the back tire moves a little, and then try kicking it again. However, it usually siezes after 1 or 2 kicks again. I really have no idea what it might be except something to do with the crank. Unless the piston turned sideways and siezed somehow haha... HELP!