hadn't ridden the bike in like two weeks, took it out the day before and it was running like a champ, than yesterday i had to start it twice for it to turn on no biggy, than i was out riding it for a good 30 min than stopped at walmart when i left there the bike sounded real rough like it didn't have power(fuel or air) u could def tell in the sound of the exhaust stopped at heb and when i came back bike wouldn't turn on that it killed the battery, got a jump and after like 3 min finally got the bike running was running good again than like 5 min later sounded rough again and even tho i gave it full throttle it would speed up just maintained speed than it started steadily going down in speed till it finally shut off and i pushed it home

any ideas?