Best Small Engine For Bicycle: Compare 10 Conversion Kits

#1 · Best Overall

1. H-YEEU 80cc Engine Kit

• Warranty Description: /

Best for: V-frame 26- or 28-inch conversions.

Why it ranks #1: Lists fit criteria for 26- or 28-inch standard V-frames, including 9–11 inches of clearance and 25–29mm tubes, plus a complete kit.

A 2-stroke 80cc engine rated at 1.15–2.5 kW gives this H-YEEU kit a clear role: adding motor power to a compatible conventional bicycle. Its stated fit covers most 26- or 28-inch bikes with a standard V-frame, while the specified clearance and tube diameter help narrow compatibility before installation.

The frame requirements are unusually specific: allow 9–11 inches between the bottom bracket and top bar, with frame tubes 25–29 mm in diameter. Checking those measurements first can help determine whether the kit suits the bicycle. The metal engine body is described as heavy duty, and the complete-conversion-kit description says hardware is included. H-YEEU also lists fuel consumption of 2.5 litres per 100 km, a useful operating figure for riders considering regular use.

Skip it if you have a frame outside the stated V-frame, clearance, or tube-diameter requirements; this kit's fit is narrowly specified.

This kit suits riders converting a 26- or 28-inch bicycle who can verify the standard V-frame measurements and want an 80cc 2-stroke setup. Treat frame clearance and tube diameter as essential fit boundaries before starting the conversion.

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

#2 · Tunable Carburetor

2. YUNLAIGOTOP 100cc Kit

• Warranty Description: Free warranty within one year for…

Best for: Tunable-carburetor 100cc builds.

Why it ranks #2: Its 100cc kit lists a tunable carburetor with adjustable jets and a one-year manufacturer-defect warranty; listed maximum speed is 48km/h.

A carburetor with a re-jettable main jet and adjustable idle controls gives the YUNLAIGOTOP 100cc kit a tuning-focused advantage. Its listed choke lever sits on the handlebars, putting a named control within reach, while the 44-tooth sprocket and upgraded CDI round out the specified conversion components.

The adjustable main jet, pilot jet, idle RPM screw, and idle-air screw provide several listed points for carburetor tuning, giving hands-on builders options to adjust engine operation. The handlebar choke lever keeps that control positioned at the rider's hands. The kit also includes a 44-tooth sprocket and upgraded CDI, while its air-cooled 100cc engine is listed with a maximum speed of 48 km/h. These details make the package especially relevant to buyers who want tunable components.

Skip it if you prefer a conversion with no carburetor adjustments to manage; this kit lists several tuning controls and a re-jettable main jet.

This YUNLAIGOTOP kit suits a hands-on builder who wants a 100cc conversion with adjustable carburetor settings, a 44-tooth sprocket, and upgraded CDI. Its tuning options are a key fit consideration for less experienced owners.

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

#3 · Highest Listed Power

3. H-YEEU 110cc Engine Kit

• Weight: 25.9 lb
• Warranty Description: /

Best for: 110cc riders prioritizing fuel economy.

Why it ranks #3: The 110cc, air-cooled two-stroke is listed for most 26- or 28-inch bicycles and gives a maximum-power figure of 3.8kW at 6000r/min.

H-YEEU lists fuel consumption of 150 miles per gallon for this 110cc engine, a specific claim that makes operating efficiency its defining appeal. The single-cylinder, air-cooled, 2-stroke setup is specified for most 26- and 28-inch mountain bikes, road bikes, and cruisers, helping buyers assess both configuration and intended bicycle types.

The 110cc displacement and listed maximum power of 3.8 kW at 6,000 rpm identify this as a larger-engine option within H-YEEU's range. Its air-cooled, single-cylinder configuration describes the engine layout, while the 150-mpg claim gives riders a fuel-use figure to consider. The kit calls for two-stroke gasoline engine oil or specified 10W/40 or 10W/30 oil, so lubricant choice is part of the operating routine.

Skip it if you want to avoid choosing and mixing engine lubricants; this 2-stroke kit lists specific oil requirements.

This H-YEEU kit fits riders seeking a 110cc setup for a listed 26- or 28-inch bike and who value the stated fuel-use figure. Account for its two-stroke operating and lubricant requirements when choosing it.

Listed on Amazon as: 110cc 2-Stroke Bicycle Gasoline Engine Motor Kit Motorized (Sliver)

#4 · Fuel-Economy Figure

4. JAYGOVAN 80cc Kit

Best for: Fuel-conscious 80cc daily riders.

Why it ranks #4: This 80cc kit lists 2.1kW output and a reference fuel-use figure of approximately 0.53 gallons per 62.14 miles.

JAYGOVAN specifies fuel use of about 0.53 gallons per 62.14 miles, giving this 80cc 2-stroke kit a concrete efficiency figure for riders weighing ongoing use. It also lists 2.58 horsepower and a top speed of 23.61 mph, pairing that consumption claim with stated power and speed figures.

The 2.1 kW output and 5,000-rpm speed figure describe the engine's stated performance, while the 23.61 mph top speed offers a separate road-speed reference. JAYGOVAN lists CDI ignition, which identifies the ignition system for buyers comparing kits. Its reference fuel-use figure of 0.53 gallons per 62.14 miles helps frame expected consumption, though actual use will depend on conditions not specified in the listing.

Skip it if you need a stated bicycle-size or frame-clearance range before purchase; JAYGOVAN's supplied details do not specify one.

Consider this JAYGOVAN kit if the listed 80cc engine, CDI ignition, and fuel-use reference suit your conversion plans. The supplied information does not state a bicycle fit range, so confirm compatibility from the available product details.

Listed on Amazon as: 80cc Bicycle Engine Kit 2 Stroke Gas Bike Motor Kit Refit Full Set

#5

5. CUBELLIN 100cc Kit

• Weight: 6.8 kg
• Warranty Description: 2 year warranty against manufacturer defects

Best for: 36-tooth sprocket conversion builds.

Why it ranks #5: The air-cooled, CDI-ignition 100cc kit includes assembly accessories and an English manual, and lists a 440-pound maximum load recommendation.

The included 36-tooth sprocket gives the CUBELLIN 100cc kit a specific drivetrain component around which to plan a conversion. Its listing also states a 200 kg maximum load and 48 km/h top speed, supplying buyers with concrete details about the sprocket, carrying limit, and claimed performance.

CUBELLIN describes this as a complete kit with assembly accessories and an English manual, which gives DIY owners listed resources for the conversion. The 36-tooth sprocket identifies the supplied drive component, while the 100cc single-cylinder, air-cooled, 2-stroke engine and CDI ignition specify the power system. A stated 200 kg maximum load is useful when assessing intended rider and cargo weight, and the 48 km/h top-speed claim provides a performance reference.

Skip it if you ride a 28-inch bike and need that size explicitly listed; the supplied wheel-size specification names 26 inches.

Consider CUBELLIN if a 36-tooth sprocket, 100cc engine, and stated 200 kg load limit match your conversion needs. The listed wheel size is 26 inches, so the fit information is narrower than some kits.

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

#6

6. IMAYCC 80cc Kit

• Weight: 26.4 lb

Best for: Hands-on DIY conversion projects.

Why it ranks #6: This 80cc two-stroke kit is listed for 26–28-inch mountain, cruiser, and road bikes; its installation notes estimate two to four hours.

A stated 2–4 hours for installation and fine-tuning makes the IMAYCC 80cc kit a more clearly scoped DIY project than kits without a time estimate. Its 2-stroke engine is listed for 26–28-inch mountain, cruiser, and road bikes, giving practical guidance on both setup effort and bicycle type.

IMAYCC says installation calls for basic hardware skills and tools, plus time for fine-tuning; that makes this a better match for a hands-on owner than someone expecting a quick bolt-on job. The included kit is described as a complete 80cc single-cylinder gasoline engine conversion, while the listed compatibility spans 26–28-inch mountain, cruiser, and road bikes. Its 26.4-pound listed weight is also worth considering when planning handling and installation.

Skip it if you want an installation that avoids tools, mechanical skills, or setup time; IMAYCC explicitly calls for all three.

Choose this IMAYCC kit if you have a compatible 26–28-inch bike, basic tool skills, and time for installation and tuning. Its stated setup demands make it less suitable for riders seeking a low-effort 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

#7

7. Tiozuiu 110cc Kit

• Weight: 24.7 lb

Best for: Air-cooled 110cc conversion seekers.

Why it ranks #7: The 110cc two-stroke listing describes air cooling, a CDI system, and fit for 26- or 28-inch bikes, but provides limited compatibility detail.

A 110cc engine paired with air cooling and a CDI system gives the Tiozuiu kit its defining configuration for a motorized bicycle conversion. The listing says it fits 26- or 28-inch bikes and reaches 6,000 rpm, making engine size, ignition, and stated bicycle compatibility central points for evaluating this setup.

The 6,000-rpm figure indicates the engine's stated operating speed, while the air-cooled design identifies how the kit handles engine cooling. CDI ignition is another named system component, useful for buyers comparing conversion configurations. Tiozuiu describes the kit as complete, with parts and accessories for converting an everyday bicycle, and lists 26- or 28-inch bikes as the fit range. At 24.7 pounds, its listed weight is relevant when arranging and carrying out installation.

Skip it if you need a listed installation-time estimate or frame-clearance measurements; this product information does not provide them.

This Tiozuiu kit may suit a buyer prioritizing a 110cc air-cooled engine, CDI ignition, and stated 26- or 28-inch compatibility. Check bicycle fit and plan for handling a 24.7-pound kit during installation.

Listed on Amazon as: 110CC Bicycle Engine Kit, 2-Stroke Gas Motorized Bicycle Conversion Kit, Gas Powered Engine Motor Kit with Air Cooling and CDI System,Gas Bike Bicycle Motor Engine Kit Fit for 26"or 28" Bikes, Black

#8

8. Mahugde 110cc Kit

Best for: Foot-pedal-start 110cc conversions.

Why it ranks #8: This 110cc air-cooled, single-cylinder two-stroke lists CDI ignition and a 2L fuel tank, with fit described for V-frames with ample triangle space.

Foot-pedal starting gives the Mahugde 110cc kit a distinctive listed starting method for a gas-powered bicycle conversion. Its air-cooled, single-cylinder, 2-stroke engine includes CDI ignition and is described for most 26- or 28-inch V-frame bicycles, offering buyers several specific configuration and compatibility points.

The engine is rated at 3 kW at 6,000 rpm, and the listed 16.4:1 total transmission ratio supplies another drivetrain specification for comparing setups. Its 2-litre fuel tank defines the stated capacity, while the 2-stroke engine uses a gasoline-and-oil mixture. The foot-pedal start is the named starting mode. Fit is described for most 26- or 28-inch bikes with V-shaped frames and ample triangular space, so frame layout remains a key installation consideration.

Skip it if you want a larger stated fuel capacity; this kit lists a 2-litre tank, while Ubnffsv specifies 0.53 gallons.

Mahugde suits riders seeking a 110cc CDI-equipped conversion with foot-pedal starting for a compatible V-frame bicycle. Check that the frame has ample triangular space and consider whether its 2-litre tank suits your routes.

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)

#9

9. Ubnffsv 100cc Kit

Best for: Longer-range 100cc conversions.

Why it ranks #9: The 100cc two-stroke includes a 36-tooth sprocket and lists a 0.53-gallon tank, but its compatibility detail is less specific than higher-ranked options.

A 0.53-gallon fuel tank gives the Ubnffsv 100cc kit a clear range-oriented feature, with the listing linking that capacity to longer journeys between refueling. Its two-stroke, air-cooled engine uses CDI ignition and a 36-tooth sprocket, while stated fit covers most 26- and 28-inch bikes.

The 0.53-gallon tank and listed consumption of about 0.66 gallons per 100 km give riders specific fuel figures to consider when planning use. A 36-tooth sprocket identifies the supplied drive component, and CDI ignition specifies the ignition setup. The listing also states a maximum load of 440 pounds, which provides a carrying-limit reference. Together, these details help buyers weigh fuel capacity, drivetrain, and load requirements for a conversion.

Skip it if you need a stated frame shape or clearance measurement for fit; this listing gives wheel sizes but no such details.

This Ubnffsv kit may suit riders seeking a 100cc conversion with a 0.53-gallon tank, 36-tooth sprocket, and stated 440-pound load limit. Its fit listing names 26- and 28-inch bikes but not frame geometry.

Listed on Amazon as: 100cc Bicycle Engine Kit, 2 Stroke Upgraded Bike Motor Kit Air-Cooling Gas Engine Motorized Bicycle Kit with CDI Ignition Mode & 36-Tooth Sprocket for Most 26inch/28inch Bikes Scooter

#10

10. AKSDSGA 100cc Four-Stroke Kit

• Weight: 42.3 lb
• Warranty Description: 1-year warranty against manufacturer's defects

Best for: Four-stroke hand-start conversions.

Why it ranks #10: It is a bicycle-specific 100cc, air-cooled four-stroke kit, but the listing gives few fit or performance details and reports a weight of 42.3 pounds.

A four-stroke, air-cooled 100cc engine sets the AKSDSGA kit apart from the listed two-stroke alternatives, while its hand-start setup defines how riders start it. The package is described as a complete bicycle engine kit with chain drive, making engine cycle, starting method, and drivetrain the core details to weigh.

The four-stroke single-cylinder engine and air-cooling specify the power unit's configuration, while the hand-start feature provides the stated starting method. A chain-drive system connects the engine setup to the bicycle, giving buyers a concrete drivetrain detail to consider during conversion planning. The kit is made with listed materials including aluminum, iron, #415 steel, rubber, and nylon. At 42.3 pounds, its stated weight makes installation and handling an important practical consideration.

Skip it if you need a listed bicycle wheel-size range or frame-clearance measurements; the supplied details do not provide them.

This AKSDSGA kit suits a buyer specifically seeking a four-stroke, air-cooled engine with hand start and chain drive. Plan around its 42.3-pound weight, and note that the supplied information does not state a bicycle fit range.

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