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Specs: KV(RPM/V): 640 Lipo cells: 2~5s Max Watts(W): 550 Max. current: 30A (10 secs) No Load Current: 0.6A Intemal Resistance: 0.120 ohm Number of Poles: 14 Shaft Size: 4mm Dimensions(Dia.xL): 42 x 26mm Bolt Holes Spacing: 25mm Bolt thread: M3 Connector: 3.5mm bullet type connector Weight: 97g (motor only without adapters and screws)