Hello. I recently got kawasaki zxr 400 (1992) and it was always bit slow to start. I haven't ridden for 2 weeks and now it's not starting. I recharged the battery and it sounded bit stronger, but still wouldn't fire up. It sometimes tried to start and stays on for split second, but won't stay on. Yesterday I got one loud pop from the exhaust. What could I do? I'm really noob when it comes to mechanical stuff.