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It's a cheap, low performance bike, why use expensive fuel? I guarantee/have observed that in 3rd world countries, the fuel is much worse than even the 85 octane they sell in Colorado, and they're like cockroaches, you can't kill them.
It won't 'hurt' the engine, any hurt to one of these engines would be something you'd detect, something catastrophic. With the OHC motors, you change the oil and it'll probably outlive you, with the CGs, even if you don't change the oil, you'll be tired of it before it dies. If it's not pinging, even if a bit lean, you won't hurt it. Too rich is worse, as it causes the engine to carbon up more, and can potentially wash the lubricating oil off of the cylinder in extreme cases.
The pushrod engines were literally designed for the third world, with third world maintenance cycles, to boot.
Sure, they're jetted a bit lean, but more so lean for performance, not dangerously lean (unless you start modding it without changing jetting, but even still, you'd notice before something went bad). They want them to hold together.
This isn't some 80s 2t motor jetted so lean that if it's uncorked it'll seize a piston, they're safe to run as is.
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