125-200cc Engine seized.....need help

First off I'm new to the site, so HI! With that being said I have a 2006 CR125 that has locked up. I was riding it at a MX track and riding it pretty hard as usual and I heard a loud pop and found myself being tossed over the bars. I push the bike back to the pits and notice the spark plug was loose. Would a loose spark plug cause a lean condition at high rpm's and produce a piston seziure?? Also now that the motor is seized how would I go about getting the piston out? A good recommended place to buy parts for it would be nice too.

Thanks

Never mind! Tore down the motor and the rod was broke at the crank! But thanks for all the help!

sorry for you mate,where are you?usa or ????im in uk n could help you out with a working bottom end for the right price.steve

Thanks but I'm in the USA. Nothing to rebuild whole motor is trashed the rod tore up everything but the transmission. Know anyone with a complete motor??