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Posted

Hey @Ellery Zandt welcome to Quadcrazy. FYI you should never post your email here. That line usually goes from the thermostat housing cover to a connection near the water pump. What its designed to do is allow some coolant to circulate through the system when the thermostat is closed. Its like a small bypass.  
I'm not sure on the Kazuma but if you can post a few more pics of the water pump area maybe we can help you out.  

Posted

Double check the reservoir for any connections, i doubt it bc its a pressurized system but you never know. 
The only other way to check is to put a pump on the  radiator  cap. Put pressure in the system and see where you have coolant coming out.  You will have to block off the port on the thermostat housing with a piece of hose with a bolt in it. They sell a multi pump for all types of radiators at Harbor freight that pressurizes  the system to help find leaks. I am sorry but i am not familiar with the Kazuma brand. 
I looked for the manual but don't see it in the library. 

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