Recently had the bike with me when i went camping. Started spitting and sputtering so i let it sit. Brought it home and cleaned the carb and air filter. Changed the spark plug. also changed the tranny oil. I put her all back together and tried to kick her for half an hour and gave up. If i push start it, it will run for about 10 seconds really rough and then die out. I put on a new coil just for shits and giggles but still nothing. What would cause no spark? And why would it do this all of a sudden?