Bought the bike about 3 weeks ago, rode it home, but i had a holiday booked, so i haven't been able to start it for 2 weeks, got back home, tried to start it, battery is low, connected it to the car, for a kick start,but the engine won't start, was thinking maybe it's the spark plugs? But for some reason the whole battery is drained, and i am unable to get the bike started, haven't tried jump starting it in 2nd gear pushing it yet, really weird since it was working when i bought it, now the engine won't start not even some backfire. Any ideas what's wrong with it? I am a beginner when it comes to the mechanics of it, but i know the obvios stuff, really don't want to spend money getting it checked by a mechanic since when i bought it it was working. Any tips/idea on where the problem is?