36V 1000W 3000RPM electric scooter motor. Powerful four brush permanent magnet electric motor design with 100% ball bearing construction. 15" long red and black power leads. Shaft rotation reversible by reversing power leads. Dimensions: 4-1/8" outside diameter x 5-1/2" long excluding shaft, 6-1/8" long including shaft. Includes factory installed 11 tooth sprocket for 8mm chain. This original sprocket can be replaced with 11 tooth sprocket for #25 chain (item # SPR-2511C), or 10 tooth sprocket for 8mm chain (item # SPR-810). Motor shaft starts out at 12mm OD and is stepped down to 10mm OD with two flat spots where the sprocket mounts, past the sprocket there is a threaded post for the nut and washer which hold the sprocket in place. Made by Unite. Weight 10 lbs.