I assume the weight limit is for the bike as a whole. There are plenty of overloaded DBs running around, just make sure your tires, bearings, axles, etc, are in good condition. Wouldn't hurt to inspect the frame real good occasionally, even though DBs don't seem to be prone to frame failure like the large Bajas are. IIRC,
@Strigoi is a pretty big guy who's had multiple DBs, he may chime in.
The only parts that concern me on DBs and other small frame Chinese minibikes are the 12mm axles and 10mm steering head bolts. I haven't seen anything about problems with them, they just seem puny to me.
As a side note, the 212 probably increased the bike's weight by around 15 lbs., so now the rider weight limit is 135!