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I think that the 250 engine may be based on the honda crf230.
The wiki for the 250gs gives actual displacement at 230cc. Other research shows it has a filter screen like the other honda based enginges and a PZ27 carb like the honda engines.
As for the vibes. Check all the motor mounts and make sure they are tight. Worn chain and sprockets or poorly mounted tires would cause vibes too.
As for that I don't think its a bad bike. Not alot of info on them, but zong is one of the better manufacturers.
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