I have a PEUGEOT vivicity 50 cc scooter no spark?

Hi i wonder if you can help me, here is my problem. I have a peugeot vivicity 50 cc scooter with the imobalizer. I have the master red key for the ignition. When i purchased the bike the old owner told me that it worked one day then nothing the next. He kept it for a year before deciding to sell it to me. When i recieved the scooter the battery was totally dead and upon examination totally dry , so i purchased a new one. since fitting the battery the indicators work the horn works the engine starter works as in turns over but No Spark.
When i turn the bike on the red light (imobalizer light) comes on for about 2 seconds then goes off and flashes twice which shows there has been 2 keys at one time. I have replaced the ht lead with no joy and also tried another spark plug still no joy. Do you have any ideas of the problem and how to fix it. The bike has been topped up with fuel and oil just no spark Thankyou