i have reason to believe this is the polini 40cc 3 port motor
1.) water pump, stock polini water pump is rear wheel driven, only other two 50cc motors are the banshee and the z1
banshee is a 50cc polini replica, z1 is a bzm replica
now unless china slapped on the banshee head (which could be a possibility), i dont think the rear wheel driven water pump would be sufficient for cooling the 50cc motor
2.)carb...14/14 sha carb on a 50cc?

, seems weird to me.
to me, every part on the bike reminds me of a 911 replica motor (water pump, carb, rad)
i dont know guys, im interested as to what you think. especially you banshee and 911 owners.
* note the pic * 14mm carb