I was riding my rancher up a slight hill and it just quit. I checked several things and found that its not getting fire to the plug. In the shed where I keep it the mice are terrible and they had built nests in the battery compartment and also between the gas tank and breather. I checked and none of the wires are excessively chewed. Its just strange to me that it just quit like it did with no warning. What are some more things that I can check?