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If the engine has 'ZS' serial number it was made my Zongshen.
the China manufactures will just license out and build there own brand from outsourced parts.
Heck even the American brand Janus motorcycles us the CG250. mostly due to cost and the EPA emissions criteria.
The reliability after that comes down to the rest of the bike qualities or lack thereof.
The triangle of performance/reliability/cost will factor each other try to excel in any 1 and you typically impact the other 2 detrimentally.
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