10 Best Bicycle Engine Kits 2025 in the United States

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.

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.

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.