There are a lot of different ways to get more torque, but a 1000w motor won't help you.. Probably the easiest is to get a Xiongda 2-speed motor and controller set. You can get them by emailing Bonnie Xiong at
bonnie@xiongdamotor.com.cn. The controller, LCD and motor cost about £250 including shipping.
Assuming that you have a 36v battery, email like this.
Can you supply me qty 1 36v 2-speed front motor, qty 1 LCD, qty1 36v controller and ship to UK?
The motor automatically changes down to a lower gear, like a winch when it starts to struggle up a hill. It's not very fast in climbing mode at about 6 mph, but it can manage anything. In high gear, it will do about 22 mph unless you set the 15 mph speed limit in the LCD.
The motor is suitable for rim brake wheels. It might be a bit wide if you have a disc brake. You have to build it into a wheel yourself or get a bike shop to do it for you, so you need to add about £30 for rim and spokes. Maybe Xiongda can supply the motor already spoked. You have to ask.
You'll need at least one torque arm if you have aluminium forks.
Ebike Motor Double-speed Motor for Front Wheel, US $ 120.00 - 120.00 / Piece, 24V,26V,48V, Brushless, > 400w.Source from Suzhou Xiongda Motor Co., Ltd. on Alibaba.com.
xiongdamotor.en.alibaba.com