ka CHUNK ka CHUNK ka CHUNK....
thats how they be "chunky".
cheap chains are crud. dispose of and replace with HD bmx chain or something similar...
as crassius said...check the rollers engage the sprocket nicely.
make sure the chain isnt so wide its grinding on the engine case or cover.
tension at the tightest point.
a new chain should be perfect, they start getting rough after about 10,000 km in my case...
make sure that rear sprocket is dead concentric. yep, barely 1mm makes for 3.1 mm on the circumference, remember.
side to side wobble, while minimizing it is good, it can tolerate some slop... depends on chain width really.
no point running wide chains on narrow sprockets as the chain "tilts", makes point contact only, wears out fast...