Best Motor Kit For Mountain Bike: Compare Gas and Electric Kits

#1 · Best Overall

1. Jeaieaiu 26-Inch Electric Kit

• Warranty Description: 2 years

Best for: 26-inch electric hub conversion.

Why it ranks #1: Its 48V 1000W rear hub motor explicitly suits mountain bikes and includes a pedal-assist sensor and thumb throttle for electric assistance.

A 48V, 1000W brushless gearless rear-hub motor makes this Jeaieaiu kit the roundup’s clearly specified electric conversion option. The package lists a pedal-assist sensor, thumb throttle, controller bag, and 26-inch motor wheel, giving buyers a defined set of components for an electric mountain-bike project.

The 26-inch motor wheel sets a clear wheel-size boundary, while the included pedal-assist sensor and thumb throttle provide two listed ways to operate the conversion. A controller bag is included to accommodate the controller, and the English manual supports the DIY workflow. The specifications also identify a seven-speed setup and linear-pull brake style, details a buyer can use when assessing how the kit relates to the existing bicycle configuration.

Skip it if you have a wheel size other than 26 inches; the BAFANG RM G020 kit lists several wheel-size options.

Choose this for a 26-inch-bike owner who wants an electric hub conversion with both pedal assist and a thumb throttle. Its specified motor wheel is 26 inches, so other wheel sizes fall outside the listed configuration.

Listed on Amazon as: 26-Inch Electric Bike Conversion Kit, 48V 1000W Brushless Gearless Rear Hub Motor (440 RPM), with PAS Sensor, Thumb Throttle, and Controller Bag—Ideal for Road, Mountain, and Commuter Bikes (DIY)

#2 · Broad Wheel Fit

2. BAFANG Rear Hub Kit

• Warranty Description: 30 days return,365 days repair or replace

Best for: Multi-wheel-size BAFANG hub kit.

Why it ranks #2: The 48V kit lists 500W/750W options and compatibility with 20-, 26-, 27.5-, 28-, and 29-inch wheels, useful across bike sizes.

BAFANG’s RM G020 rear-hub kit lists compatibility with wheel sizes from 20 to 29 inches, including 26-inch and 700C options. That range is its key practical distinction for mountain-bike owners whose wheel size may not match a single-wheel-size conversion kit.

The 48V rear-hub configuration is offered in 500W or 750W variants, giving buyers two stated power choices to consider. Its wheel-size list includes 26, 27.5, and 29 inches as well as 20-inch, 700C, and other listed sizes, making the kit relevant to varied bicycle builds. An LCD display is optional, so buyers should account for that when deciding which listed configuration suits their intended controls and ride information.

Skip it if you require an LCD display in the listed package; the Jeaieaiu 26-inch kit lists its motor wheel, sensor, throttle, and controller bag.

A mountain-bike owner seeking an electric rear-hub conversion across several wheel sizes can consider this BAFANG kit. Choose between the listed 500W and 750W options, and account for the LCD display being optional.

Listed on Amazon as: BAFANG 48V500W/750W Rear Hub Motor Kit for 20"/26"/27.5"/700C/28/29" Bike

#3 · Mountain Gas Option

3. IMAYCC 80cc Gas Kit

Best for: Hands-on 80cc kit installer.

Why it ranks #3: Its listed compatibility includes 26–28-inch mountain bikes, and the complete 80cc two-stroke kit provides a gas-powered alternative.

The IMAYCC kit pairs an 80cc two-stroke engine conversion with stated compatibility for 26–28-inch mountain, cruiser, and road bikes. Its most useful distinction for a prospective buyer is the clearly described installation workload: plan on basic hardware skills, tools, and time for fitting and fine-tuning.

IMAYCC estimates two to four hours for installation and fine-tuning, so this kit suits a rider prepared to handle a hands-on conversion rather than expect a ready-to-ride bicycle. The listing calls for basic hardware skills and tools, and recommends reading its instructions before beginning. Its stated compatibility includes 26–28-inch mountain bikes, cruisers, and road bikes, giving buyers a defined wheel-size and bike-type starting point for assessing the project.

Skip it if you want an electric conversion or cannot set aside time for hands-on fitting; the Jeaieaiu 26-inch electric kit is an alternative.

This is for a rider with a listed 26–28-inch bike who is comfortable using tools and doing installation adjustments. Its stated two-to-four-hour estimate is a practical planning guide, not a no-work conversion.

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

#4 · Four-Stroke Choice

4. Fobuaggc 100cc 4-Stroke Kit

Best for: Four-stroke high-speed conversion.

Why it ranks #4: The 100cc four-stroke kit explicitly lists mountain bikes and claims 3.5HP, with forced-air cooling and hand starting.

The Fobuaggc listing gives this 100cc four-stroke engine a stated 3.5HP output and maximum speed of 50km/h, positioning it for buyers considering a motorized mountain bike. Its forced-air-cooled, OHV configuration adds useful engine details beyond displacement alone.

The forced-air cooling and four-stroke OHV single-cylinder configuration give buyers specific engine characteristics to assess for a conversion. The listing describes compatibility with mountain, road, gravel, and beach bikes, broadening the stated bicycle types beyond mountain use. It also lists aluminum, iron, and plastic construction materials and a 25-degree engine incline, details relevant to evaluating the engine package and installation orientation before a project begins.

Skip it if you need a clearly enumerated accessory set and manual; the CheriMuMu 100cc kit lists both assembly accessories and an English manual.

This may suit a rider seeking the listed 100cc four-stroke configuration for a mountain, road, gravel, or beach bike project. The supplied information does not enumerate kit contents, so plan around that limitation.

Listed on Amazon as: 100CC 4 Stroke Bicycle Engine Kit, Hand Start Gas Motorized Motor Bike Modified Engine, Bike Motor Kit with Air-Cooling, for Road Bikes Mountain Bikes

#5 · One-Year Warranty

5. AKSDSGA 100cc 4-Stroke Kit

• Warranty Description: 1-year warranty against manufacturer's defects

Best for: Four-stroke hand-start project.

Why it ranks #5: This 100cc air-cooled four-stroke kit names mountain bikes and includes a one-year warranty against manufacturer defects.

A 100cc, single-cylinder four-stroke engine distinguishes this AKSDSGA kit from the two-stroke options in the roundup. The listing also specifies air cooling and hand starting, details that help a buyer understand the engine configuration and starting approach before committing to a bicycle conversion project.

The four-stroke, air-cooled configuration gives buyers a specific engine type to evaluate, while the hand-start description in the title identifies how the motor is started. Included components are listed as one four-stroke bicycle engine kit, so the supplied information does not establish a complete set of bicycle-conversion accessories. At 42.3 pounds, the stated kit weight is also worth considering when planning handling and installation on a bicycle.

Skip it if you need a clearly listed complete accessory set; the CheriMuMu 100cc kit specifies accessories for assembly and an English manual.

Consider this for a buyer specifically seeking a 100cc four-stroke, air-cooled, hand-start engine project. The listing gives limited conversion-kit contents, so account for that uncertainty when planning a mountain-bike installation.

Listed on Amazon as: 100CC Bicycle Engine Kit 4 Stroke Bicycle Gasoline Engine Motor Complete Hand Start Motorized Bike Kit with Chain Drive and Air-Cooled, Bike Motor Kits for Road Bikes Mountain Bikes

#6

6. YUNLAIGOTOP 100cc Gas Kit

• Warranty Description: Free warranty within one year for…

Best for: Tunable two-stroke conversion.

Why it ranks #6: Its 100cc two-stroke kit lists a 48km/h maximum speed and an upgraded tunable carburetor, but the supplied fit details are less specific.

A tunable carburetor with a re-jettable main jet gives this 100cc YUNLAIGOTOP kit a notable adjustment option for riders who want access to engine settings. The listed package also includes a 44-tooth sprocket and upgraded CDI, tying key conversion parts to the motorized-bike setup.

The carburetor includes a handlebar choke lever, main and pilot jets, and idle adjustment screws, giving an owner several specified controls for setup and tuning. Its 44-tooth sprocket and upgraded CDI are identified as included kit components, reducing the need to source those named parts separately. The engine is air-cooled and kick-started, with a listed maximum speed of 48km/h; buyers should be prepared for that starting method and two-stroke operation.

Skip it if you prefer a hand-start four-stroke engine; the AKSDSGA 100CC four-stroke kit is listed with hand start.

A mechanically involved rider seeking a tunable 100cc two-stroke conversion may value its carburetor controls and named included parts. Check that kick starting and the listed bicycle fit suit your mountain-bike build.

Listed on Amazon as: 100cc Bicycle Engine Kit 2 Stroke Motorized Bicycle Engine Motor Kit Gas Bicycle Engine Conversion Kit with Air-Cooling, Bike Motor Kit Fit for 26"-28" Bikes

#7

7. CheriMuMu 100cc Gas Kit

Best for: 26–28-inch two-stroke conversion.

Why it ranks #7: The 100cc two-stroke kit includes a 36-tooth sprocket and lists fit for most 26–28-inch bicycles, though mountain-bike fit is not singled out.

A listed 36-tooth sprocket and stated fit for most 26–28-inch bicycles make the CheriMuMu 100cc kit a clearly scoped gas-conversion option. It includes an English manual and assembly accessories, giving a DIY mountain-bike owner a defined starting point for the installation process.

The single-cylinder, air-cooled two-stroke engine uses CDI ignition, according to the listing, while its 36-tooth sprocket is a named drivetrain component. The included English manual and assembly accessories support setup without leaving those items to separate sourcing. The listing also specifies different gasoline-to-oil ratios for break-in and afterward, so owners need to follow the stated mixing guidance during operation.

Skip it if you do not want to mix gasoline and two-stroke oil; the Jeaieaiu 26-inch electric hub kit avoids a listed mixed-fuel requirement.

A DIY rider with a 26–28-inch mountain bike who accepts two-stroke fuel mixing can consider this complete-accessory conversion. Follow its separate break-in and after-break-in mixture guidance when preparing the engine for use.

Listed on Amazon as: Bicycle Engine Kit, 100cc 2-Stroke Gas Motorized Conversion Kit

#8

8. CUBELLIN 100cc Gas Kit

• Warranty Description: 2 year warranty against manufacturer defects

Best for: 36-tooth economy-focused gas kit.

Why it ranks #8: This 100cc two-stroke kit includes assembly accessories and an English manual, but its supplied fit information does not specifically establish mountain-bike compatibility.

A 36-tooth sprocket anchors this CUBELLIN 100cc two-stroke conversion kit, which also lists a 48km/h top speed and 150 miles per gallon. The stated 200kg maximum load gives riders another concrete planning figure when considering a motorized bicycle for everyday use.

The kit includes assembly accessories and an English manual, which supports a more complete installation workflow than an engine-only listing. Its air-cooled, single-cylinder, CDI-ignition configuration identifies the main engine setup, while the 36-tooth sprocket is a specific drivetrain component to account for during conversion. The listed 200kg maximum load and 26-inch wheel size provide useful boundaries for a prospective bicycle build.

Skip it if you need a stated fit for 28-inch wheels; the CheriMuMu 100cc kit specifies fit for most 26–28-inch bicycles.

This kit fits a buyer planning a 26-inch conversion who values its specified sprocket, included assembly accessories, and listed load limit. The wheel size is specifically listed as 26 inches, an important boundary for other bikes.

Listed on Amazon as: 100cc Bicycle Engine Kit 2 Stroke Motorized Bike Motor Kit

#9

9. H-YEEU 80cc Gas Kit

• Warranty Description: /

Best for: V-frame gasoline conversion.

Why it ranks #9: The 80cc kit fits many 26- or 28-inch V-frame bikes with specified clearance, but it does not explicitly identify mountain bikes.

A complete 80cc two-stroke kit with included installation hardware gives riders a direct route from a regular bicycle to a gasoline-powered motorized bike. Its stated fit covers many 26- and 28-inch bikes, while the clearance and tube-diameter requirements make frame measurements central to choosing it.

The kit specifies a standard V-frame with 9–11 inches of clearance between the bottom bracket and top bar, plus 25–29mm frame tubes. Those measurements give buyers concrete checks before assembly rather than relying on wheel size alone. Its heavy-duty metal engine body is presented as a durability feature, and the supplied hardware supports a complete conversion workflow. The listing also gives fuel consumption of 2.5 litres per 100km, useful for riders considering longer motor-assisted trips.

Skip it if you have a frame outside the stated V-frame, clearance, or tube-diameter range; the BAFANG RM G020 rear hub kit is an electric alternative.

A hands-on rider with a compatible 26- or 28-inch V-frame can consider this complete gasoline conversion for faster rides. Measure frame clearance and tube diameter first; the stated fit conditions are more specific than wheel size alone.

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

#10

10. Mahugde 110cc Gas Kit

Best for: High-output DIY gas conversion.

Why it ranks #10: Its 110cc kit is described for mountain bikes, but its fit details are broad and the listed foot-pedal start and 2L tank add fewer useful fit specifics.

The Mahugde kit lists a 110cc two-stroke engine with 3kW maximum power at 6000rpm, making its stated output the key differentiator for a DIY gasoline conversion. It is described for V-shaped bicycle frames with ample triangular space, so frame layout matters alongside the engine specification.

Its stated 16.4:1 transmission ratio and foot-pedal starting mode give buyers concrete drivetrain and starting details to consider during a conversion. The 2-litre fuel tank provides a listed capacity for planning rides, while the two-stroke configuration specifies gasoline-and-oil mixing. Because fit is described around V-shaped frames with ample triangular space, checking that frame area is important before beginning this engine installation.

Skip it if you have a frame without ample triangular space or want an electric setup; the BAFANG RM G020 rear hub kit is electric.

This suits a DIY rider seeking the listed 110cc two-stroke output and prepared to handle mixed-fuel operation. Its stated frame fit calls for a V-shaped frame with ample triangular space, so inspect that area before choosing it.

Listed on Amazon as: Upgraded 110cc Bicycle Engine Kit, 2-Stroke Gas Motorized Bicycle Conversion Kit for 26" /28" Bikes Fit Petrol Gas Motor Kit Engine Refit Full Set with CDI for DIY Motorized Bicycle Bike (Black)