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I'm the guy with the worn oil pump chain. The only counterbalanced engine I've opened up is my Lifan 200 pushrod engine which has a gear driven balance shaft and chain driven oil pump. I assume other manufacturers use a similar design. The non counterbalanced pushrod engines have a gear driven oil pump as does the original Honda CG125 that these engines are cloned from. My other 2 Chinese CG clone engines without the balance shaft have no chains at all.
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