I started my YAMAHA DRAGSTAR 650 after Three Months. It did start after a couple of Cranks. It idles alright but the Engine dies when I rev it. What could be the problem ? I can only think of two reasons. 1. The little Black Box (Relay, Ignition Coil ?) in between the Battery and the plugs is not throwing enough current (But then why does it idle alright?) 2. Carburator fuel jets may be clogged. PLEASE HELP.