I have a 2004 Predator 50 that is hard to start when using the electrical starter. Most of the time it will not even start with the starter. It will start very easily with the kick start. My eight year old son it not big enough to use the kick starter. I have replaced the starter, battery, and spark plug. Any ideas on what the problem might be?? It use to work fine with the electrical starter but recently it will not work. Any help is greatly appreciated. Thank you!!