When adding gasoline to a two-stroke engine, it is necessary to mix the two-stroke engine oil in proportion according to the instructions It is recommended for professionals to purchase, as installation may be difficult and beginners should try cautiously. Cannot be returned,Please check and install before placing an order! Please check and install before placing an order! Details Practical Carburetor: It automatically adjusts the mixing effect according to the engine’s operating conditions, ensuring smooth and reliable performance in various riding situations. Grippy Rubber Handles: Designed with a slip-prevention pattern, the rubber handles enhance comfort while minimizing hand fatigue during longer rides. Muffler: It can reduce the noise during engine running, making cycling more comfortable. Application This product is suitable for most V-frame 26-28 inch wheeled bicycles, mountain bikes, motorcycles, and road bikes, and can be widely used in commuting, mountain cycling, road cycling, wilderness exploration, and other occasions. Specification Materials: Aluminum, Iron, Rubber Process: Lathe Machining, Spray Painting Color: Black Assembly Required: Yes Engine Type: 2-Stroke Single-Cylinder Gasoline Engine Heat Dissipation Method: Air Cooling Start Method: Foot Pedal Start Applicable Brake: V-Shaped Brake, Clamp Brake Clutch Type: Manual Drive Position: Front Wheel Ignition Method: CDI Ignition Spark Plug Model: Z8CM14 × 1.25 Fuel Type: 90 # Gasoline Fuel Oil Mixture Ratio: 16:1 (New Equipment), 20:1 (After Driving 500km/310.69 Miles) Fuel Consumption: 2L/0.53gal/100km/62.14mile Chain Wheel Teeth: 44 Teeth Spoke: 36 Number of Chain Teeth: 110 Displacement: 80cc Horsepower: 2.58hp Torque: 4N.m Engine Power: 2.1KW No Load Speed: 5000RPM Maximum Speed: 38km/23.61mile/h Fuel Tank Capacity: 2L/0.53gal Suitable Bicycle Wheel Size: 85.3-91.86cm/26-28in Engine Size (L*H): 23*24cm/9.06*9.45in Package Size: 41.5*41*17cm/16.34*16.14*6.69in Gross Weight: 11.39kg/25.11lbs Net Weight: 11kg/24.25lbs Package Included 1 * 2-Stroke Engine 1 * Muffler 1 * Ignition Coil & CDI 1 * Carburetor 1 * Electronic Speedometer 1 * Chain 1 * Fuel Tank 2 * Rubber Handles 1 * English Instruction Other Accessories for Assembly Notes 1. Please read the operating manual completely before use. And pay particular attention to the safety instructions included. 2. This product needs to be installed in the middle of the bicycle triangle frame, so please pay attention to the size of the triangle space on the frame. If the space is too small, the air filter of the carburetor may touch the frame. 3. The white wire of the magnetic coil does not need to be connected, please just wrap it with electrical tape (not included) for insulation. 4. Drivers need to have basic hardware skills and tools, and it takes approximately 2-3 hours to install and fine-tune. If you don’t have experience or are installing the product for the first time, please read our instruction and search online for an "80cc bicycle engine kit". This will be of great help to you and eliminate many faults during the installation process. 5. Before starting, this product does not require additional oil to be added to the machine. After a period of time, apply some solid grease (excluding) to the gears inside the casing. Please use two-stroke engine oil (not included) in the fuel tank to mix the fuel. Please store gasoline, engine oil, and mixtures (excluding) in safe containers, and do not add near heat sources or sparks. Please turn off the throttle before parking. 6. Please allow the slight color difference caused by the shooting light and 1-3cm error due to manual measurement, and make sure you do not mind before ordering. Exceptional Build Quality: Crafted primarily from aluminum and iron with lathe machining and spray painting processes, this product is built to withstand impact, rust, and corrosion, and deliver reliable long-term performance. High-Performance Engine: Equipped with an advanced two-stroke engine delivering 2.1KW (2.58HP) of power and a spare speed of 5000 RPM, this kit offers robust acceleration and a thrilling top speed of 23.61 MPH—turning every ride into an exciting experience. Fuel-Efficient Design: Designed with efficiency in mind, the two-stroke engine achieves excellent fuel economy—consuming approximately 0.53 gallons per 62.14 miles (reference value)—helping you conserve on fuel costs while enjoying extended riding range. Easy Ignition: Featuring a user-friendly CDI electronic ignition, the engine starts easily with just a simple pedal press, getting you on the move quickly and conveniently.