hey everyone i just bought a 94 ninja and it has been running great for the first month untill the last few days. it will not start, i drained one battery trying to start it, replaced the battery and had the same problem. it backfired a day before when it started up. everything is stock, i have the manual and tried opening the throttle all the way, still nothing. I am gonna look into replacing the spark plugs, and try jump starting it. Any ideas on what this could be? the battery dies down untill the engine wont start. thank you.