Recently my exhaust fell off but because I had to get to work and had no other way of getting there I had to continue to use it until my new exhaust came. Anyway, a couple of days before exhaust came I started having problems. It started to pull up when I was riding it, slowing down then speeding up erratically. Now the exhaust is on but the problem has got worse. When I try to start it won't start unless I shake it violently side to side and then it kicks in, but even then not convincingly, and it also seems to help when I tap the side of it with my foot, around where the timing hole cap and fan cover is, that seems to help with it starting to. Any ideas what the problem might be? Please help!
