if you decide to buy chinese, it really doesn't matter which one, all the chinese quads use about 90% of the same off the shelf compoents, basicly the frames and plasic are the only differants.

 

Kazuma brand has not had many problems with frames cracking and like any other atv you should check all the major nuts and bolts anyway. Like I said Kazuma has been around a long time and the kids quads are pretty relaible. The sunl brand did have problems with frames but are better. If you go chinese go with kazuma, redcat or baja. You wont get many problems if any out of these.