My quad has been sitting for about a week because of all the rain we've been having. I woke up this morning thinking I was going out to go for a ride, and tried to start it up and it tried but it wont. The neutral light does come on when I flip the key. I can hear it trying to turn over but its struggling. What could be the problem? Also its got a full tank of gas and the carb was rebuilt/cleaned back in march.