My bike won't start at all. I think it might be flooded. In the past week I've had my dad knock it over on accident and leave it on it's side for a day but I was able to get it to start and run. Then a couple of days later it died on the trail while I was riding it. I could not get it to start after. I cleaned the air filter then it would start. Now my brother rode it, stalled it, couldn't get it to start and pushed it home. When he was pushing it home he never turned off the gas and was opening the throttle accidentally when he was pushing it home. Now it won't start at all. This was a couple of days ago. New spark plug?