My son's lt80 not runing right.It will start fine but when he is riding it for about 5 min it starts to bogged down.When you push the gas it starts bogging down and then it cut off.We had it for about 3 years and no problems.I dont know much about atv's so I was hoping it is a easy fix or I will have to take it in.Anyone has any idea what I should look at.