6 Best Pit Bike Engines 2025 in the United States

The Bikerid 125CC 4 Stroke Engine Motor Kit is designed for a variety of Honda pit bikes and similar models, making it versatile and widely compatible. It features a 125cc, single-cylinder, air-cooled engine, which is a solid choice for pit bikes, providing a good balance of power and simplicity.

With a maximum power output of 6.5 kW at 7500 rpm and a manual 4-speed transmission (1 down, 3 up), riders can expect decent performance and control. The inclusion of necessary accessories like the carburetor, kick starter lever, and gear shift lever adds value, making it a comprehensive kit for installation.

The engine also features a wet multi-plate clutch and CDI ignition system which are reliable for consistent performance. However, the cooling system is air-cooled, which might not be as efficient as liquid-cooled systems in preventing overheating during extended use. Fuel consumption is moderately efficient, while the lubricant capacity is 900ml, suitable for this engine size. This kit is best suited for DIY enthusiasts and those looking to replace or upgrade engines in compatible Honda pit bikes.

The LIYUANJUN 125CC 4-Stroke Engine Motor Kit is a robust option for pit bike enthusiasts, specifically tailored for Honda models like the CRF50, XR50, and others. With a 125cc engine displacement, it offers a substantial power boost for your dirt bike. The engine type is a single-cylinder, 4-stroke, which is known for its durability and efficiency. The air-cooled system is effective in preventing overheating during long rides, ensuring a smooth performance even under strenuous conditions.

The manual clutch with a 4-speed transmission allows for precise control and a more engaging riding experience, which can be particularly appealing to those who enjoy a hands-on approach to riding and maintenance. This setup also tends to be more cost-effective compared to automatic transmissions. The included PZ22 carburetor enhances fuel efficiency and provides a consistent throttle response, contributing to an enjoyable ride. However, the kick starter might be inconvenient for some users who prefer an electric start. Additionally, while the manual clutch offers greater control, it may present a learning curve for beginners.

The CDI ignition system optimizes spark timing and intensity, further enhancing fuel efficiency and engine performance. Given its compatibility with various Honda pit bike models, this engine kit is a versatile option for those looking to upgrade their bike's performance. It's advisable to confirm compatibility with your specific model before purchasing. This engine kit could be an excellent choice for intermediate to advanced users who appreciate hands-on control and maintenance.

The WPHMOTO Lifan 150cc 4 Stroke Oil Cooled Racing Engine is a solid choice for riders looking to upgrade or replace the engine on popular small dirt bikes like the XR50, CRF50, and similar models. Its 150cc displacement and 4-stroke single-cylinder design offer a good balance of power and reliability. With a horsepower of about 9 kW (around 12 hp) at 7500 rpm and a torque of 11 Nm at 5000 rpm, it provides enough punch for typical pit bike use, including racing and trail riding.

The engine features a 4-speed manual transmission with a manual clutch, giving the rider full control over shifting, which is preferred for a more engaging riding experience. An important feature is the oil cooling system, which helps keep the engine temperature stable during longer or harder rides, potentially extending engine life compared to air-cooled alternatives. Additionally, this engine kit includes a carburetor and wiring harness for easier installation.

There are a few downsides to consider. The engine is slightly heavy compared to some air-cooled models, which might affect bike handling for very young or small riders. It also has a relatively high top speed rpm, so it may require tuning for optimal performance depending on your specific bike setup. Some buyers noted that installation instructions could be clearer, so a basic mechanical knowledge or professional help might be needed. This engine represents a reliable and powerful upgrade for pit bike enthusiasts who want a durable 4-stroke engine with efficient cooling and solid performance.