10 Best 100cc Bike Motor Kits 2025 in the United States

The YUNLAIGOTOP 100cc Bicycle Motor Kit is a 4-stroke gasoline engine, which offers more stability, reliability, and quieter operation compared to 2-stroke engines. With a maximum output of 3 horsepower and a 3600rpm speed, this kit provides ample power for commuting and short trips.

The engine is made of high-performance aluminum alloy, making it durable and resistant to damage, further protected by a sturdy plastic casing. Its fuel efficiency is supported by a 1.6-liter fuel tank capacity, ensuring longer rides without frequent refueling. The forced air cooling system and 56mm bore cylinders help maintain lower operating temperatures and enhance load carrying capacity, making the engine easier to start and providing continuous output across speeds.

Installation is relatively straightforward with a recoil start system, although some users might find the complexity of attaching a motor to a bicycle challenging. The noise level is notably lower than typical 2-stroke engines, contributing to a more pleasant riding experience. This product could benefit those looking for a reliable, quiet, and durable motor kit for their bicycles, especially if they prioritize ease of use and fuel efficiency.

The TTONSUE 100cc Bicycle Motor Kit is designed to convert a standard bicycle into a motorized one. It fits most 26” or 28” wheeled bikes, including mountain, cruiser, chopper, and road bikes, making it versatile for various bike types. The engine is a 2-stroke petrol gas motor, which means it is relatively simple but might require more frequent maintenance compared to a 4-stroke engine.

The 56mm bore cylinder is designed to improve bearing capacity and reduce working temperature, helping with smoother starts and consistent performance across different speeds. The kit includes essential components such as the engine, CDI assembly, fuel tank, carburetor, exhaust muffler, and various cables, ensuring you have everything needed for installation. Users have praised it for its ease of installation, which is a big plus if you're not mechanically inclined.

However, as a 2-stroke engine, it may not be as fuel-efficient as some 4-stroke engines and can be noisier, which might be a concern in quieter neighborhoods. The build quality and durability seem promising. If you're looking for an easy-to-install motor kit to give your bike an extra boost, this could be a solid choice, although you might want to consider the noise and fuel efficiency factors.

The LIYUANJUN 4 Stroke Bicycle Engine Kit is designed for beach bikes with large triangular frame spaces. This kit converts your regular bike into a motorized one, achieving up to 3600rpm for efficient commuting and short-distance travel. One of its standout features is the four-stroke engine, which is generally more stable, reliable, and quieter compared to two-stroke engines.

The engine's bore cylinder enhances load capacity and helps in maintaining lower operating temperatures, making it easier to start and delivering consistent performance within a certain speed range. Additionally, the kit boasts a large 1.6L fuel tank and low fuel consumption, which can be very appealing for riders looking to save on fuel costs. The materials used, including aluminum, iron, and plastic, suggest good durability and build quality, ensuring long-term use.

The product also includes a comprehensive set of components and an English manual that should facilitate the installation process. Despite these minor drawbacks, the LIYUANJUN 4 Stroke Bicycle Engine Kit appears to be a solid choice for those looking to enhance their cycling experience with reliable motorization.