I think I've found the manufacturer for the pitster/puzey.

http://chinaxingyu.ecvv.com/products/1329290.html

http://chinaxingyu.ecvv.com/products/1329286.html

They have the 250 water cooled loncin engine in them and the other xingyu models are in the puzey product listing (gy-400 explorer)

It looks like they make allot of stuff that gets rebranded, is it possible that make the galaxy brand too.