when I turn it on it starts to stall and then it turns off?

What is your question?

I got it used, I changed the sparkplugs, I put in new rotor, distributor cap and wires. I took the old wones out but I forgot to write down where each one was supposed to go on the distributor cap. I that why it's not running well?? I pushed the rotor as much as I can and its making contact. before while I rode it it would start to turn off until i would put it in neutral at the light or as long as I was giving it gas....I really need your help.