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Underengineered stuff can be repaired, or rather "repaired", with spare parts from any local hardware store, like hammer, wire, zip ties, WD40, etc. You can't really fix a fuel injection on the side...

Extra oil is better not only during the break-in. In worst case, it will foul the plug, but if you have a spare, as Zorge, suggests, that's not a problem. And you may need to clean/change exhaust...