Safe and Efficient: With a maximum power of 1.4kw and a safe TCI ignition system, you can use this product safely. In addition, its working speed can reach 6800rpm, providing you with a fabulous riding experience. Complete Engine Kit: The engine is equipped with all the needed hardware that can upgrade most traditional bicycles into electric bicycles, including an engine, fuel tank, wrench, bolts, chains, etc. You don't need to buy other accessories, which saves you a lot of money. Large Capacity: The engine's fuel tank can hold 2L/67.6pz of gasoline, allowing you to use it for a longer period of time with a single fill-up. Fast and Smooth: It uses a four-stroke engine, which is more stable, reliable, and quieter than its 2-stroke competitors. And the heavy-duty metal engine adds much durability and stability, allowing for safe and smooth riding. Low Noise: Low noise level for a four-stroke engine will not produce too much noise when riding and creates a good riding environment for you.