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10 Best Bicycle Engine Kits 2025 in the United States

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Our Top Picks

#1

Winner

Mahugde Upgraded 100cc Bicycle Engine Kit 2 Stroke Bike Motor, Air-Cooling Gas, Engine Motorized Bicycle Kit with CDI Ignition Mode and 36-Tooth Sprocket for Most 26"/28" Bikes Scooter

Rating
9.9
Chosen by1,299
Speed and Performance
Installation Complexity
Durability and Maintenance

Most important from
4 reviews

Speed and Performance
The engine kit runs smoothly and efficiently right from the first start, delivering reliable performance without issues.
Installation Complexity
Installation is straightforward, especially with the help of online video guides, making the setup process accessible even for beginners.
Durability and Maintenance
Adjusting components like the clutch cable correctly ensures optimal engine function and a hassle-free ride.

The Mahugde Upgraded 100cc Bicycle Engine Kit is designed to convert a regular 26" or 28" bicycle into a motorized bike, making riding faster and more exciting. It uses a 2-stroke gasoline engine that is air-cooled, which is common in lightweight motor kits and generally easy to maintain. The 100cc engine size provides a good balance of power for casual riders, while the single-speed chain-driven setup keeps things simple. Its fuel tank holds 0.53 gallons, allowing longer rides without frequent refueling, and it consumes fuel at a moderate rate around 0.66 gallons per 100 km. The kit supports a maximum rider weight of 440 lbs, making it suitable for most adults. The build quality is solid, featuring an aluminum engine body and iron fuel tank, with treatments to improve durability and ensure stable operation over time.

Noise and vibration levels are low for this type of engine, producing about 75 decibels, so it won’t be overly disruptive outdoors. Installation requires assembly, which might be a bit challenging if you’re not handy with bike mechanics, but it fits most standard mountain bikes with 26" wheels. One limitation is that it has only one speed, so hill climbing or very fast speeds might be limited compared to more advanced kits. Also, being a 2-stroke engine, it requires mixing oil with fuel and regular maintenance to keep it running well. This kit is a great choice if you want a straightforward, durable motor kit that boosts your bike’s speed and has decent range, especially for casual riders who don’t need complex gearing or electric power.

Rating
9.9
Chosen by1,299
Speed and Performance
Installation Complexity
Durability and Maintenance

Most important from
4 reviews

Speed and Performance
The engine kit runs smoothly and efficiently right from the first start, delivering reliable performance without issues.
Installation Complexity
Installation is straightforward, especially with the help of online video guides, making the setup process accessible even for beginners.
Durability and Maintenance
Adjusting components like the clutch cable correctly ensures optimal engine function and a hassle-free ride.
#2

TTONSUE Bicycle Motor Kit 100cc, Motorized Bicycle Engine Kit 2 Stroke Petrol Gas Motor Engine Kit Fits Most 26" or 28",Bicycle Engine Kit Petrol Gas Motor Engine Kit (100cc 2 Stroke 36 Tooth)

Rating
9.8
Installation Complexity
Compatibility

Most important from
9 reviews

Installation Complexity
Installation is straightforward and manageable for users, with practical tools included in the package.
Compatibility
The kit includes complete accessories with high-quality hardware, ensuring good adaptability.

The TTONSUE Bicycle Motor Kit 100cc is a solid choice for those looking to convert a regular bike into a gasoline-powered one. Featuring a 2-stroke petrol engine, it promises a powerful ride with its 100cc engine size, suitable for various bike models including mountain, cruiser, chopper, and road bikes with 26" or 28" wheels. The kit includes all necessary parts for installation, including the engine, fuel tank, carburetor, exhaust muffler, and various cables, making it quite comprehensive.

One of its highlighted features is the 56mm bore cylinder which helps in better performance and ease of starting the engine, while also maintaining a consistent output across different speeds. This ensures a smoother ride and reliable performance. However, the installation process might be challenging for some users, especially those with limited mechanical experience, as it involves multiple components and precise assembly.

Additionally, while the durability and maintenance standards are good, being a 2-stroke engine, it might require more frequent maintenance compared to 4-stroke engines. Despite these considerations, the TTONSUE Bicycle Motor Kit offers a robust solution for bicycle enthusiasts looking to add a motor to their rides, provided they are comfortable with the installation process.

Rating
9.8
Installation Complexity
Compatibility

Most important from
9 reviews

Installation Complexity
Installation is straightforward and manageable for users, with practical tools included in the package.
Compatibility
The kit includes complete accessories with high-quality hardware, ensuring good adaptability.
#3

80cc Electric Start Engine Kit, 2-Stroke Motorized Bicycle Kit Fit for 26" Bikes, Petrol Gas Motor Kit Engine Set with Super Fuel-efficient, Powerful Engine

Rating
9.8
Durability and Maintenance

Most important from
6 reviews

Durability and Maintenance
The electric start function can be problematic, with users experiencing issues after only a few uses.

The 80cc Electric Start Engine Kit by Ebikestar is designed to enhance bicycle performance by converting a regular bike into a motorized one. This kit features a powerful 2-stroke engine that is fuel-efficient and provides a significant boost in speed and performance. The electric start function is a notable advantage, making it easier to start the engine without the need for strenuous pedaling. This can be particularly useful for those who prefer convenience and ease of use.

The kit is compatible with most 26-inch and 28-inch V-frame bikes, which includes mountain bikes, road bikes, and commuter bikes, making it versatile for various users. Installation may require some hands-on experience and basic tools. The included manual provides detailed assembly steps, and customer support is available for any installation queries. Durability is a strong point, thanks to the heavy-duty metal engine body, designed to withstand regular use.

For those comfortable with some DIY work and looking for an affordable way to motorize their bike, this engine kit could be a good fit.

Rating
9.8
Durability and Maintenance

Most important from
6 reviews

Durability and Maintenance
The electric start function can be problematic, with users experiencing issues after only a few uses.

Buying Guide for the Best Bicycle Engine Kits

Choosing the right bicycle engine kit can transform your regular bike into a motorized one, providing you with extra speed and convenience. To make the best choice, it's important to understand the key specifications and how they align with your needs. Here are the main factors to consider when selecting a bicycle engine kit.
Engine TypeThe engine type is crucial as it determines the power source and performance of your bicycle. There are mainly two types: two-stroke and four-stroke engines. Two-stroke engines are lighter and simpler, providing more power for their size, but they are noisier and less fuel-efficient. Four-stroke engines are quieter, more fuel-efficient, and have a longer lifespan, but they are heavier and more complex. If you need a lightweight and powerful engine for short commutes, a two-stroke might be ideal. For longer rides and better fuel efficiency, a four-stroke engine is preferable.
Engine Size (cc)Engine size, measured in cubic centimeters (cc), indicates the engine's capacity and power. Smaller engines (50cc) are lighter and easier to handle, suitable for casual riding and short distances. Medium-sized engines (80cc) offer a balance of power and weight, ideal for moderate distances and varied terrains. Larger engines (100cc and above) provide more power and speed, suitable for long distances and hilly terrains. Choose an engine size based on your typical riding conditions and the level of power you need.
Fuel TypeThe type of fuel your engine uses affects its performance and maintenance. Most bicycle engine kits run on gasoline, but some may use a mix of gasoline and oil, especially two-stroke engines. Gasoline engines are straightforward and widely available, making them convenient. However, if you prefer a cleaner and more environmentally friendly option, consider kits that support alternative fuels like ethanol blends. Your choice should depend on fuel availability and your preference for maintenance and environmental impact.
Installation ComplexityThe complexity of installing the engine kit can vary significantly. Some kits are designed for easy installation with minimal tools and mechanical knowledge, making them suitable for beginners. Others may require more advanced skills and tools, which could be a fun project for those who enjoy tinkering with bikes. Consider your mechanical skills and the time you are willing to invest in the installation process when choosing a kit.
CompatibilityCompatibility refers to how well the engine kit fits with your existing bicycle. Not all kits are universal, so it's important to check if the kit is compatible with your bike's frame, wheel size, and other components. Measure your bike and compare it with the kit specifications to ensure a proper fit. This will save you time and frustration during installation and ensure a smoother ride.
Speed and PerformanceThe speed and performance of the engine kit are determined by its power and design. Some kits are designed for higher speeds, making them suitable for those who want a faster ride. Others focus on providing steady and reliable performance for daily commuting. Consider your riding style and needs – if you need a kit for leisurely rides, a moderate-speed kit will suffice. For thrill-seekers or those with longer commutes, a high-performance kit might be more appropriate.
Durability and MaintenanceDurability and maintenance are important factors to ensure the longevity of your engine kit. Look for kits made from high-quality materials that can withstand regular use and various weather conditions. Additionally, consider the maintenance requirements – some engines need regular oil changes and tune-ups, while others are more low-maintenance. Choose a kit that matches your willingness and ability to perform regular maintenance to keep it running smoothly.

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