That is a heavy machine, for under 300 cc's.
Unless they've found a magic way to get killer hp out of a small motor like these rice burner cars on the road these days with 400 hp doing 10 sec 1/4 mile.
Doubt it.
Anybody have this Rock Quad to tell about it?

 

Very heavy, and there has got to be a lot of power loss in the 4wd drive system compared to a simple 2wd chain system. 50 mph has to be an exaggeration. My old Taotao 250 would indeed do 50 mph with factory gearing but it weighs less than half as much.