Clutch Issue, Won't Run! HELLPP!

I have just replaced my clutch pads, and now my motorbike won't start. When I ride it while the clutch is disengaged it is as it should be, but when I engage the clutch, it sounds like its trying to start but then, it'll start to sound like the clutch is halfway out and doesn't try to start anymore. Did I adjust anything incorrectly when I was putting it all back together?

Well to let you all know, I got it running, wooooo! The issue was that I had the wierd screw looking thing holding the clutch plate on to loose. But now there's another issue. When I start it, it'll start like normal, but there is a loud noise that sounds like something inside the motor is hitting it, however, it only does this when the clutch is engaged. If it is idling with the clutch disengaged it will run perfectly. I did switch from a regular chain to a heavy duty one, but if i coast without the clutch engaged and the motor running, there is no noise, so it is only when it is engaged. What is this noise?! Help!

I don't know how, but it appeared that the heavy duty chain I bought was hitting somthing without making a mark, so thanks for your help.