Bubba,

Welcome to the forum. I had two versions of this bike (the enduro model) in China and took it over some crazy roads with no signs of cracking. I think the problem may be the motards could use a painted plastic which is prehaps a little more brittle. Check for over tightened screws.

The enduros use an extremely strong and felxible color-in-plastic. If you can replace the back plastic from one of the enduro models, you may solve your problems although the colors may not be the same (hard to go wrong with black though).

Let us know how it goes!

CC