[Thumper]

An adult may have reasons to spend more for the perfect bike, with every desired feature. Kids are much more flexible and can learn about their bikes working on them. They will be very happy with a good bike, and WHEN they break it, it won't be as big of a deal if you choose a less expensive model!

They will get that with ALL of these bikes, including the more expensive ones. Look around on this site, and even the more expensive models have failures, need maintenance and work now and then.

People have been tuning carbs for decades. It is not rocket science. And you are not stuck with the lean running conditions of the stock enrichment curve. Nothing wrong with a carbed Chinese bike.

ALSO regarding the Zongshen engines (also applies to Loncin, Lifan, depending on the model)- The 229cc ZS engines are pushrod valve actuated. The 249cc ZS engines have overhead cams. Both styles are dependable, OHC are more efficient and powerful. OHC heads suffer less valve lash variation due to heat expansion. But adjusting valves is a useful skill to have. Your kids can both learn how to do this.