you have no idea how many times people come into the shop and say "The battery is fine but the starter won't work", and it's actually a bad battery. Make sure you check the battery with a load tester. A lot of the time if you just use static voltage check the battery will be 12v but under load it drops. The next most common issue is the starter relay. Not sure where it's located off the top of my head on a Vitality, on the people 50 it's in the front by the horn. A little 4 wire black box about an inch tall and 1/2 inch wide. You can test it by jumping the two large wires coming into it with a paperclip or jumper wire. Possibly the previous owner did not know how to start it and toasted the starter motor, but this is not common with such a small engine. Start with a load test on the battery, otherwise you will be chasing your tail diagnosing the other items.