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Have you looked into Suzuki for tips? The Qingqi 200 engine is based on the Suzuki 200cc engine as Qingqi is the OEM for Suzuki's small engines. We have had several discussions on what people did to their Qingqi bikes--look around in the search for the brand name (in the US) 'Qlink XF 200' as that is who imported the bikes to the US. Other regional brands' names should show up, too.