I am having scooter which I sparingly use as I my regular use vehicle is a motor cycle. Today, I gave my motor cycle for servicing and I had the problem of starting my scooter. When I took it to mechanic, he examined and on enquiry with me about its use, told me that we should not leave petrol in the vehicle which is not in use for a long time. Instead, he suggested to fill the petrol as and when required and use it. He said that the evaporation of petrol coupled with degradation of lubricating oil which will be mixed with it during filling leads to this starting problem.
Another problem I find with battery start vehicles is discharge of battery.
This is a lesson learned today.