dead in the water

[JARVIS518]

last week i went to take out the bike (3rd time of the year) started right up but sounded a bit off, let it sit for a second sound went back to normal. put it in gear still normal, twist the throttle a little and it dies and wont start back up. i keep trying it til i kill the battery, a few backfires but nothing. put it back on the trickle charger and try it again the next day still nothing. this week i change the plugs and clean the air filter, plug everything back in and still nothing. at this point i am completely lost and just want to burn the thing to the ground. any ideas would be helpful