Low oil like that is very bad for the 200X topend.
Normally, the 200X valvetrain is known for being a bit noisy or "ticky" even when freshly rebuilt. It really all depends on how noisy it is in regards to whether or not it's an issue.
You're probably not going to want to hear this, but....
Having owned several of those, if I bought one and it had that little of oil in it, I would probably tear down the topend at the very least. Those engines are known to melt down cam lobes, rocker pads, and cam journals as soon as the oil supply runs out of topend and there's no telling how long the previous owner ran it with so little oil in it. The topend is always the first to starve for oil when it's low. I'd also pull the clutch cover and clean out the oil pump rotor body thing and don't forget to pull the oil screen out from behind the drain plug and clean it thoroughly as well. Make very sure to reinstall the screen in the correct direction (consult manual)
They are highly reliable motors until they've been run without oil for too long (which is not very long at all) and then they need attention. I've been inside twenty or more 200X motors and low oil to the topend is the most common engine damage I've seen inside of one of these by far.
You may not have to pull the whole topend. Id take the valve cover off and inspect the cam lobes, journals, and rocker pads. You'll need to remove the camshaft completely inspect those journals correctly. Look for scratches and obvious heavy wear. The side edges of the cam lobes will have a 'lip' from excess wear if it's worn heavily. If it checks out all good, then you can reassemble without buying anything because the valve cover doesn't even use a gasket. Use a VERY thin layer of sealant when you reinstall the valve cover and you're gtg
Here's a free manual download to help you along
https://threewheelermanuals.com
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