125cc 4 stroke bicycle engine kit

Types of 125cc 4-stroke bicycle engine kits

The 125cc 4-stroke bicycle engine kit is an internal combustion engine that converts chemical energy from fuel into mechanical energy, allowing the bike to move. The 125cc 4-stroke bicycle engine kit has different types that include:

• Single Cylinder Engine

  The 125cc 4-stroke single-cylinder bicycle engine kit is the most common type of engine found on standard and customized bicycles. This engine only has one cylinder that generates power by going through the four-stroke cycle of intake, compression, power, and exhaust. These engines are loved due to their simple design, reliability, and low maintenance. They also provide smooth and steady power delivery, making them perfect for everyday riding and commuting.

• Parallel-Twin Engines

  Parallel twin engines have two cylinders that are positioned side by side and are often used in some specialized 125cc 4-stroke bicycle engine kits. Each cylinder goes through the four-stroke cycle and generates power. The power produced by the two cylinders is balanced, making the engine run smoothly and evenly. These engines are more powerful than the single-cylinder engine, providing more power and torque, which is good for hilly terrains and high-speed riding.

• Vertical Twin Cylinder Engines

  Some specialized 125cc 4-stroke bicycle engine kits use vertical twin-cylinder engines. These engines have two cylinders positioned vertically, one on top of the other. The two cylinders work together to produce more power, which is helpful for steep hills and high-speed riding.

• Four-cylinder Engines

  Some high-performance or racing 125cc 4-stroke bicycle engine kits will have four-cylinder engines. The four cylinders work together to create a lot of power, making these engines suitable for high-speed performance. However, these four-cylinder engines require more maintenance compared to the other engines.

• Electric Start vs. Kick Start

  Some 125cc 4-stroke bicycle engine kits have electric start systems that allow the engine to start with a push of a button. This is convenient for users, especially those with disabilities or when the engine needs to be started multiple times during the ride. Other kits have a kick start, which requires manual effort to start the engine by kicking a lever. Electric start engines are more complex and require a battery, while kick-start engines are simple and lighter.

Specifications and Maintenance of 125cc 4-stroke bicycle engine kits

The following are the general specifications that buyers should expect to see when purchasing 125cc 4-stroke bicycle engine kits.

• Engine displacement: 125cc

The engine kit has a total of 125 cubic centimeters of engine power. This power allows the bike to reach higher speeds and better performance on the road.

• Engine type: 4-stroke single-cylinder

The engine kit has a 4-stroke single-cylinder type of engine. This type of engine is very fuel efficient, has a higher and better performance power output, and is also very reliable.

• Maximum power: 5-9kw

The engine kit has a maximum power output of 5-9 kilowatts. This power output allows the bike to have higher and better performance on the road.

• Maximum torque: 6-10Nm

The engine kit has a maximum torque of about 6–10 Newton meters. This torque provides the bike with good acceleration and climbing ability.

• Fuel consumption: 1.5-2.0L/100km

According to the specifications of the 125cc 4-stroke engine kit, the bike's fuel consumption is about 1.5 to 2.0 liters per 100 kilometers. This shows that the engine kit has good fuel efficiency.

• Cooling system: Air-cooled

The engine kit has a cooling system that is mainly air-cooled. This cooling system is very reliable and simple, requiring low maintenance.

• Starting system: Kick start

The engine kit has a starting system that is a kick start. This is a very simple and reliable starting system.

Below is the maintenance guide for the 125cc 4-stroke bicycle engine kit

• Oil change: When changing the oil, make sure to drain the old oil completely and replace it with new oil. This will help keep the engine lubricated, improving its performance and reliability.
• Air filter replacement: Replacing the air filter will help improve the bike's fuel efficiency and performance. Make sure to remove the old air filter and replace it with a new one.
• Valve clearance adjustment: Adjusting the valve clearance will help improve the engine's performance and reliability. This is done by checking and adjusting the valve clearance to the specified measurement.
• Carburettor tuning: Tuning the carburettor will help improve the bike's fuel efficiency and performance. This is done by adjusting the air and fuel mixture to the specified recommendation of the manufacturer.
• Spark plug replacement: Replacing the spark plug will help improve the bike's starting ability and overall performance. Make sure to remove the old spark plug and replace it with a new one.
• Regular maintenance schedule: To keep the bike in a good and better performance state, make sure to follow a regular maintenance schedule. With this, users are advised to check the oil level, clean the air filter, and carry out other maintenance services regularly.

How to choose 125cc 4-stroke bicycle engine kits

When choosing a 125cc 4-stroke bicycle engine kit, consider the following factors:

• Compatibility

  Make sure the engine kit is compatible with the existing bike's framework and setup. To ensure proper installation and operation, check the bike's frame size, axle length, and other characteristics.

• Quality and reliability

  Go for trustworthy brands or providers that offer premium 125cc 4-stroke bicycle engine kits. Examine client testimonials and reviews to assess the reliability and performance of the engine kits.

• Legal compliance

  Check that the 125cc four-stroke bicycle engine kit complies with local laws and regulations on noise emissions and emissions. Some areas have strict rules on engine modifications and emissions standards.

• Warranty and support

  Consider the warranty and after-sales support that the manufacturer or supplier offers. A solid warranty and helpful customer service may provide peace of mind and assist with any future problems or inquiries.

How to DIY and Replace 125cc 4-stroke bicycle engine kits

Some basic tools and mechanical knowledge are required to install a 125cc 4-stroke bike engine kit successfully. Follow these steps:

• Prepare

  Read the instruction manual. Gather tools like wrenches, screwdrivers, and pliers. Ensure the bike is clean and well-maintained.

• Disassemble

  Remove the pedals, crankset, and bottom bracket. Take off the bike's chain and derailleur. Remove the front wheel and fork.

• Assemble

  Mount the engine on the bike. Attach the engine's output shaft to the bike's frame using engine mounting bolts. Install the engine's cooling system, exhaust system, and fuel system.

• Connect

  Connect the engine to the bike's electrical system. Connect the engine to the bike's drivetrain by connecting the chain to the engine's sprocket. Adjust the bike's brakes, gears, and other systems to work with the new engine.

• Test

  Check that all components are properly installed and functioning. Conduct a test ride to ensure the engine works well and the bike rides smoothly.

Q and A

Q1: Can I convert any bicycle to a 125cc 4-stroke bicycle engine kit?

A1: Not all bikes can be converted into a 125cc 4-stroke bicycle engine kit. Only some specific types of bicycles, like mountain bikes, hybrid bikes, and some adult-sized bikes, are better suited for conversion. The bike needs to have a sturdy frame and good-quality components to handle the extra speed and weight of the engine kit.

Q2: Is the 125cc 4-stroke bicycle engine kit fuel-efficient?

A2: Yes, the engine is efficient. Many users report fuel efficiency of around 100 miles per gallon, but actual results can vary based on riding habits, bike maintenance, and other factors.

Q3: How fast can a 125cc 4-stroke bicycle engine go?

A3: Generally, a 125cc 4-stroke engine can reach speeds of 30 to 40 mph. However, the exact speed depends on various factors, including the bike's weight, aerodynamics, and engine tuning.

Q4: How long does it take to install a 125cc 4-stroke engine kit?

A4: The installation time can vary but typically takes 4 to 8 hours, depending on the mechanic's experience and the specific bike model.

Q5: Is a 125cc 4-stroke engine kit suitable for beginners?

A5: While the 125cc 4-stroke engine kits are not overly powerful, they are best suited for riders who have some experience. Beginners should first gain riding experience on a standard bike before transitioning to an engine-assisted bike.