Best Small Motor For Bike: Compare 7 Electric and Gas Kits

#1 · Best Overall

1. Haeweypf Brush DC High-speed Motor

• Voltage: 24 V DC
• Wattage: 350 W
• Weight: 2.6 kg
• Material Type: Aluminum, Copper

Best for: Compact 24V brushed-kit builds.

Why it ranks #1: This 24V, 350W kit includes a controller, throttle, sprocket, chain, and freewheel, plus a stated weight of 2.6 kg.

A complete 24V brushed package makes the Haeweypf MY1016 practical for buyers who need more than a bare motor: it includes a controller, throttle, sprocket, chain, and freewheel. Its 350W rating and 3000rpm rated speed give the kit a defined operating class for a matching electric-bike build.

The 24V DC, 350W motor is rated at 3000rpm, while its 25H 11-tooth motor sprocket, 80-tooth chain sprocket, chain, and freewheel spell out the supplied drivetrain parts. That bundle can simplify parts planning for a compatible build, but the 25H specification needs to match the intended drivetrain. The aluminum body and copper coil are listed construction details, and the controller is described as having heat dissipation and multiple protections.

Skip it if you need a 48V electric kit; Unndysrt Brushed Motor Kit is rated for 48V and includes an LED throttle display.

Pick this kit for a 24V build where the included controller, throttle, and 25H drivetrain parts suit the bike. Its 350W rating and chain specification set clear electrical and mechanical fit boundaries.

Listed on Amazon as: 24V 350W Brushed Electric Motor Kit, Speed Controller, Throttle with Key

#2 · Best 48V Kit

2. Unndysrt Brushed Motor Kit

• Voltage: 48 V

Best for: Adjustable-speed 48V conversions.

Why it ranks #2: Its 48V, 1000W brushed motor kit includes a controller, chain, and throttles with LED display, and supports infinitely adjustable speed.

Infinitely adjustable speed control is the defining feature of Unndysrt’s 48V, 1000W brushed motor kit, letting riders modulate acceleration and deceleration from the throttle. The included LED display makes speed information visible at the controls, while the motor, controller, chain, keys, and throttle pair provide core conversion components.

The 26A controller and infinitely adjustable throttle let riders select speed rather than rely on a single setting, and the non-slip throttle supports comfortable hand control. Its 48V rating identifies the electrical system this kit is intended for, while the included LED display keeps information at the handlebars. The supplied chain is specified for an 8mm T8F sprocket, so buyers can assess drivetrain compatibility before installation; the 5cm mounting-bracket length is another useful fit detail.

Skip it if you need a 24V replacement motor; Vevitts YZ011 is rated for 24V systems.

Choose this kit if you want a 48V brushed setup with adjustable throttle control and an at-hand LED display. Check the 8mm T8F chain and 5cm bracket dimensions against your bike before committing to the installation.

Listed on Amazon as: 48V 1000W Brushed Motor Kit, Electric Dc Motor Kits 3000rpm with 26A Infinitely Adjustable Speed Controller Throttles with LED Display for Scooters Go Karts Motorized Bicycle E-Bike

#3 · Best Gas Conversion

3. H-YEEU 80cc Bicycle Gas Engine Motor Kit

• Material Type: Metal

Best for: Gas-powered standard-bike conversions.

Why it ranks #3: This complete 80cc bicycle engine kit is listed for most 26- or 28-inch bikes, with specified frame-clearance and tube-diameter requirements.

The H-YEEU 80cc two-stroke kit converts a compatible bicycle into a gasoline-powered motorized bike, with the listing stating speeds up to 45km/h. Its fit guidance targets most 26- or 28-inch bikes with a standard V-frame, giving buyers specific frame measurements to check before starting the conversion.

The kit includes the engine and needed installation hardware, which gives a converter core components for a bicycle build rather than a standalone replacement motor. Fit is specific: the frame needs 9–11 inches of clearance between the bottom bracket and top bar, with frame tubes 25–29mm in diameter. The listing describes fuel consumption of 2.5 litres per 100km and a metal engine body, helping buyers weigh operating needs and construction alongside the stated speed.

Skip it if you lack a standard V-frame or the specified clearance; IMAYCC 2STROKE Engine 80CC KITS also targets 26–28-inch bikes.

Consider this kit for a gasoline-powered conversion when your 26- or 28-inch bicycle meets the stated V-frame, clearance, and tube measurements. Its engine format and frame requirements make it a poor match for bikes outside those fit limits.

Listed on Amazon as: 2 Stroke 80cc Cycle Bicycle Gas Motorized Gasoline Engine Motor Kit

#4 · Best Installation Guidance

4. IMAYCC 80cc Motorized Bike Kit

• Wattage: 2.1 KW
• Weight: 26.4 lb

Best for: Hands-on 80cc bike converters.

Why it ranks #4: The 80cc two-stroke kit is specified for 26- to 28-inch bikes; its listing advises allowing 2–4 hours for installation and fine-tuning.

The IMAYCC 80cc two-stroke kit includes an installation commitment as well as an engine: the listing calls for basic hardware skills and about two to four hours for installation and fine-tuning. Its fit range covers 26–28-inch mountain, cruiser, and road bikes, giving several bicycle styles a stated conversion target.

The 80cc single-cylinder gasoline engine comes as a complete kit, so buyers can approach it as a conversion package rather than a standalone motor. The listed 2.1kW output identifies its power class, while the 26–28-inch fit range covers mountain, cruiser, and road bikes. Installation requires basic hardware skills and approximately two to four hours of work and tuning; the manufacturer also points first-time installers to its instructions and an installation video for guidance.

Skip it if you want a 24V electric motor rather than gasoline conversion; Vevitts YZ011 is a 24V DC replacement motor.

This kit fits hands-on converters with a 26–28-inch bike in a listed style and time for installation and tuning. Its gasoline engine format and stated skill requirement are important boundaries for choosing it.

Listed on Amazon as: IMAYCC Bike Motor Kit 80cc Motorized Bike Kit 2 Stroke Gas Bicycle Engine Conversion Kit Fit for 26-28" Bikes Red

#5

5. Vevitts 350W Electric Motor

• Voltage: 24 V DC
• Wattage: 350 W-hours
• Weight: 4.5 lb
• Material Type: Aluminum

Best for: 24V replacement motor buyers.

Why it ranks #5: This 24V, 350W replacement motor has an 8mm shaft and is listed as compatible with Razor MX350, MX400, and E300 scooters.

A reversible 24V motor makes the Vevitts YZ011 a focused replacement option for compatible electric scooters, including Razor MX350, MX400, and E300 models. Its aluminum body and copper coil are paired with natural air cooling, while clockwise operation is specified as the correct running direction for normal use.

The 8mm shaft and 3000rpm rated speed give buyers concrete dimensions and operating information for assessing a replacement, and the product listing specifically names Razor MX350, MX400, and E300 compatibility. Its 24V DC rating suits a matching electrical system. The motor can run in reverse by rotating counterclockwise, but that direction turns 200–300rpm slower than clockwise operation, a practical distinction when planning the control setup or expected performance.

Skip it if you need a complete bicycle conversion kit; H-YEEU’s 80cc Silver Bicycle Gas Engine Motor Kit includes conversion hardware.

This is for riders replacing a 24V motor in a listed compatible scooter or another setup matching its shaft and electrical specifications. Treat the lower counterclockwise speed as a boundary if reverse operation matters to your application.

Listed on Amazon as: Vevitts Small Brushed Permanent Magnet Electric Motor for E Scooter Drive Speed Control 24V 350W 3000RPM

#6

6. Kunray BY1020 Brushless Motor Kit

• Voltage: 48 V
• Wattage: 2000 W
• Weight: 6 kg
• Material Type: Aluminum

Best for: High-output 48V brushless builds.

Why it ranks #6: The 48V kit delivers up to 2000W peak power and includes a controller and throttle, but its high output is less suited to a small-bike setup.

A 2000W peak brushless motor sets the Kunray MY1020 apart for riders seeking a high-output 48V drive system. The kit pairs the motor with a 33A controller and LCD throttle, and its aluminum body, copper winding, and natural air cooling describe the motor’s construction and cooling approach.

The 48V rating and 42A maximum current are important electrical-system figures for planning a compatible build, while the included 33A controller and throttle provide core control components. At no load, the motor’s rated speed is 4300rpm, and the supplied T8F 11-tooth sprocket chainwheel identifies the drivetrain interface to check. The brushless design and natural air cooling define its operating approach; wiring changes can reverse its running direction.

Skip it if you need a 24V motor system; Haeweypf MY1016 is rated for 24V DC.

This kit suits a high-output 48V build where the motor, controller, throttle, and T8F sprocket match the rest of the setup. Check voltage, current, and drivetrain requirements carefully before installation.

Listed on Amazon as: Electric Brushless DC Motor Kit,48V 2000W Motor,33A Controller,LCD Throttle

#7

7. Kunray KR5V 5000W Motor Kit

• Voltage: 72 V
• Wattage: 5000 W
• Weight: 5.5 kg
• Material Type: Aluminum

Best for: High-power 72V brushless builds.

Why it ranks #7: Its 72V, 5000W brushless kit includes a 100A controller and #35 chain components, but the listing does not identify a bicycle-specific fit.

The Kunray KR5V combines a 72V, 5000W brushless motor with a 100A Fardriver controller, making its high-voltage electrical requirements the first fit consideration. The kit also includes a #35 chain and sprocket, while its five-pair V-magnet rotor and rear-cover Hall sensor are notable motor details.

The included 100A controller pairs the motor with a substantial current specification, so buyers should plan the electrical system around the listed 72V kit rather than treating it as a small replacement motor. The supplied #35 chain and sprocket establish the drivetrain format to check against the bike. Kunray says the five-pair V-magnet rotor can improve brushless motor performance, and the Hall sensor sits in the back cover, where the listing says it is less prone to burning out than an internal placement.

Skip it if you are assembling a 48V drive; Kunray BY1020 is rated at 48V and includes a controller and throttle.

Choose the KR5V for a build planned around its 72V rating, 100A controller, and #35 drivetrain. It is not a small-voltage replacement; confirm that the bike’s electrical and chain setup suits these specifications.

Listed on Amazon as: Kunray KR5V 72V 5000W Electric Brushless DC Motor Kit Temperature Sensing