50cc , 2007 speedfight?

hi there just bort speedfight 2007 , non runner m hi got one black key no red key.it turns over ok all light ect work ok.but no signs of fighering up. iv been looking at coments on imobilizers ,, thing is not shore wot one is if sor it ? dont get me wrone i no basik . pluss it as plenty of spark from plug ...iv chect plugs / all wireing. just wonderd if somone can tell me how i can tell if it as a imobilizer, and how to tell if thats the problem?? thanks