Haven't seen one. I don't know how well chrome will hold up on the hot cylinder and head.
Sickbikeparts and some other vendors sell polished engine covers for the 2 strokes.
With a little work, those little Chinese motors can look pretty cool.
Just get yourself some sandpaper in grits from 150 through 600, some 0000 steel wool and a tub of metal polish. Pop in a movie, and get to work!
Start with the 150 grit paper, then work your way up to 600. (It's best to use a sanding block on the flat surfaces.) Once your done with the sandpaper, buff the metal with the steel wool. Then, go at with a soft cloth and some metal polish.
And....Wah-La! (that's french for "TA-DA!").....shiny motor!