You can't run that with half a float. A float is a part that is specifically designed a certain way and size to match the needle . If your float is wrong it will either open to much or not enough the needle valve causing a flooded carb or a carb with not enough fuel to run. I'd check eBay for one or find find a matching carb on eBay ( make sure the mm's are the same as far as the intake side and exhaust side and if the throttle cable slide is in the same location it will work.if its one of those funny named Japanese bikes like a bms or sum thing they got a bunch of those on eBay .
SOURCE: Atomik Pit Bike
After hunting around the web for a few, it sounds like the spring is from the timing chain tensioner. It looks like there is a button on the end of the cylinder, that end goes in first, then the spring. See if the spring is the same on both ends, the picture looks like it's smaller at one end and that end goes into the tensioner, not the bolt. I'll include a screen shot of the picture.
Good luck!
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