hey great site...........
nothin to hard bout the pw50( if it yamaha) my 5 year old kids got an o5 model. (bought him 93 model but sold it after a month to a mate for twice what i paid for it then i chucked in xtra 400 bucks and got him a newbie) simple petrol goes in carby to motor to spark plug makes power.
check if fuels at carby first then pull carby apart blow clean with air.
put it back together and it should start, if it dont check the spark . only thing that wont give spark is broken ignition module, they real cheap in australia, should b cheaper there to.
It is hard to kill one of them, only problem adults find is the clutch wont lock up with much weight on the seat.