Okay so I bought this MINT stock '07 crf50 with a tb 88 kit on it. Was riding it and then all the sudden the bike bogged out and stalled. Now it doesn't start up. I'm pretty sure I blew it up but the kickstarter isn't locked up and if I try to roll start it it wants to start but is still bogged and died. Now how can I tell if I have a race head or not becuase I want to get a new piston for this thing asap. And what else should I look for that could have caused this?