i ride a honda sportrax 400ex, so yesterday i was riding my quad with my buddies down there road. and we decided to gun it. but when i pushed in the accelarator i noticed my quad wasnt going any faster. and then it started bogging down real hard and i heard a loud noise from my quads engine. now when i go to start it up it turns over but wont catch and start up. what could i have blown?