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Please confirm the battery level, whether the battery is installed correctly, and whether the shrapnel is installed backwards. If the shrapnel is not in good contact with the battery, it will not be able to start without power.
Please check whether the order of the gear combinations in the gearbox is wrong or reversed according to the instructions.
Usually the operation is not smooth because the burrs are not trimmed cleanly. Check whether the burrs of the parts are completely cut according to the instructions.
You can contact our online customer service for supplementary matters