The bolts backed out of the chain sprocket on the rear axle of my son's 250 V4S and destroyed the bearing housing. He spoke with V bike today and they said they had to look and he should call back Tuesday. Does anyone know where else I can find one, in case V bike says they have to order one from China.

 

The Jetmoto 250 had the same problem with the bolts coming lose and creating havoc. Looks like all Jet and V 250 owners should take steps to tighten and loc tite the bolts in place before theirs come out!
John at Racways might be able to help. I think V uses the same rear axle as many of the other Chinese atv's (not Jetmoto who uses their own design)
The Jetmoto 250 with the stock bolts:

After Bolt Change Out: