hi, ive just bought the 2002 model of the 125 kymco zing. I bought it off a friend and its not working, im pretty sure is the spark plug but i cant locate it as Im still learning about bikes, i was also wondering if anyone could tell me how to change the oil? i know these things are fairly simple but i dont want to go to a garage because its alot of money. anyone that could help please do, my e-mail adress is: magicjazz@hotmail.co.uk. thanks very much