DIY Electric Bike Conversion: Using a Starter Motor

Transforming a traditional bicycle into an electric bike can be an exciting project for DIY enthusiasts. In this guide, we'll walk you through the steps to create an electric bike using a starter motor from a car, providing a powerful and cost-effective way to electrify your ride.

Step 1: Acquire a Starter Motor and Battery
Firstly, you'll need a starter motor, which is designed to jump-start a car's engine. These motors are robust and capable of providing the necessary torque. Ensure that the motor is in good working condition. You will also need a suitable battery to power the motor, preferably a 12V battery to match the starter's standard operating voltage.

Step 2: Choose the Right Bike
Select a bicycle that is sturdy enough to handle the additional weight and torque of the motor. The frame should have enough space to mount the motor and battery securely.

Step 3: Mount the Motor
The starter motor will need to be mounted to the bike frame, usually where the bottom bracket is located. Custom mounts can be fabricated or purchased to secure the motor in place. Ensure the motor's drive can engage with the bicycle's chain or wheel.

Step 4: Install a Throttle
You will need a throttle to control the motor's power. Throttle kits can be bought online and are typically easy to install on the handlebars.

Step 5: Set Up the Drive Mechanism
The starter motor needs to be connected to the bike's drivetrain. One method is to use a chain or belt to connect the motor's output shaft to the rear wheel sprocket. Adjust the tension so that there is no slippage, but not so tight that it causes undue strain.

Step 6: Connect the Electronics
Wire the motor to the throttle and battery, ensuring all connections are secure and insulated to prevent shorts. Use a fuse between the battery and motor for added safety.

Step 7: Testing and Tuning
Carefully test the electric bike in a controlled environment. Make necessary adjustments to the motor alignment, chain tension, and throttle response.

Safety Note:
Please be aware that converting a bike with a starter motor can result in high speeds and torque. It's essential to implement proper safety measures like speed controllers and to use this ebike in accordance with local laws and regulations.

Building an electric bike with a starter motor is a challenging but rewarding project that can give a second life to both the motor and a conventional bike. Remember to always wear protective gear and ride responsibly.