G,day Jetcrew I went through this same dilemma two years ago , I brought a cheap quad put it together then junked it ( they do not turn too good) I ended up getting a couple of suzuki 50 (great kids bike) they were rode around for a while , but being second hand there was a fair it of maintenance involved . I ended up buying them two suzuki 50 four strokes LT 50 Z Key/pull start easily get 4-5 hrs out of a tank , and believe me they get filled up twice a day . But another good thing is that to start them you have to engage the park brake and engage the lock mechanism to start them ,which means you have a hand that is big and strong enough to activate the brakes , and the smarts to to do it , by the way my girls were three and five when the new bikes came , and the youngest could not start her bike without supervision where they ride is a private property and you can see them ride from the comfort of camp . As you were alluding to in your original post a quality jap bike is trouble free and the resale makes them worthwhile . Just my two cents as a owner operator cheers Graham