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The engine makes it look like your ride is a Joyner Commando 650; maybe an early year model. The picture of the engine compartment on other websites is very, very similar to yours for the Commando. The same engine is used in the Joyner Sandspider and probably other rides. That should give you a start in searching for parts.

Ok Thank you Vaughn

The engine block casting process is pretty standardised, and would need to have some sort of piece to attach the coolant hose. So they used a typical thermostat housing. That way they don't have to engineer a hose nipple. Then pay to have it manufactured, which would only increase costs. The thermostat housing can be easily sourced. And it's common in any manufacturing industry to source common, non- propietary parts from elsewhere, and not manufacturing in- house. So it's natural to call it what it is, even though it doesn't actually contain a thermostat. That would be my guess. I'm sure that you could put one in there if it has the relief cut around the rim. So that the thermostat would properly seat, & seal. Although that wouldn't help your overheating problem. My guess would still be a water pump problem, or air in the system. Of course, not examining it personally, I can't totally rule out a blockage in the system, a clogged radiator or internally collapsed hose or something. But that seems extremely unlikely, and I trust that you've eliminated those possibilities.

I don't see how a thermostat missing would cause overheating. The thermostat is used to get the motor to heat up to operating temp, so you can run a heater, etc. Lack of a thermostat would cause it to run too cool. I'd look for other problems, like the water pump impeller running backwards. It has to push water in a certain direction, or it doesn't work right. I had a jeep that had this problem. The parts house gave me one to fit a serpentine belt. Which went underneath the bottom side of the pulley. Turning it the opposite direction. Or an air bubble in the system. Today's cooling systems have to be "burped" sometimes. Especially foreign cars.