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Many types of 125ccm engines power various vehicles. Here are some common ones:
1. 4-stroke cycle
This is an internal combustion engine that uses gasoline as fuel. The 125cc 4-stroke engine generates more power and runs smoothly. It is more reliable and requires little maintenance. However, it has low torque and power compared to the 2-stroke engine.
2. 2-stroke cycle
This is an internal combustion engine that uses gasoline as fuel. The 125cc 2-stroke engine is lighter and has a higher power-to-weight ratio. It generates high torque and power, making it suitable for racing. However, it produces more emissions and requires more maintenance.
125cc electric engines
These engines use battery power and are known for their high efficiency. The 125cc electric engines offer lower operating costs and require less maintenance. They also produce zero emissions and are environmentally friendly. However, they have limited range, and the initial cost is high.
125cc air-cooled engines
The 125cc air-cooled engines are cooled by air. They are simple and have fewer components. This makes them more reliable and cost-effective. The 125cc air-cooled engines have lower maintenance requirements. However, they are suitable for low-speed applications and generate more noise.
125cc liquid-cooled engines
The 125cc liquid-cooled engines are cooled by liquid. They are suitable for high-speed applications. The 125cc liquid-cooled engines experience less temperature fluctuation and have a longer lifespan. They also generate less noise. However, they are complex and have more components. This makes them expensive and increases the maintenance requirements.
The following are specifications for the 125ccm engine:
Engine Type:
Air-Cooled, 4-Stroke, Single-Cylinder
Displacement:
125 cc (cubic centimeters)
Bore x Stroke:
52 mm x 58 mm
Compression Ratio:
9.0:1
Maximum Power:
8.5 kW (11 hp) at 8,000 rpm
Maximum Torque:
10.5 Nm (7.7 lb-ft) at 6,500 rpm
Fuel System:
Carburetor or Fuel Injection
Ignition System:
Electronic Ignition
Starting System:
Kick Start or Electric Start
Transmission:
Manual or Automatic, 4 or 5-Speed
Final Drive:
Chain or Belt
Frame:
Steel or Aluminum
Suspension:
Front: Telescopic Forks, Rear: Twin Shock Absorbers
Brakes:
Front and Rear Drum or Disc Brakes
Wheels:
Front: 17 inches, Rear: 17 or 18 inches
Dimensions:
Length: 1,900 mm, Width: 700 mm, Height: 1,100 mm
Weight:
95-110 kg (209-243 lbs)
125 ccm engines have specific requirements to perform well and last long. Here are some maintenance tips:
Regular oil changes:
Oil lubricates the engine parts and prevents friction. The oil also traps dirt particles, ensuring the engine runs smoothly. Check the oil level regularly and change the oil based on the manufacturer's recommendations.
Replace the air filter:
A clean air filter allows optimum airflow to the engine, ensuring it performs well. Replace the air filter every 12,000 miles or 18,000 kilometers. Riders in dusty areas should replace the air filter more frequently.
Coolant flush:
Water is the most used coolant in bike engines. However, it is important to change water after a few months as it loses its effectiveness. The water may also contain contaminants that can damage the engine parts. Change the water after six months or 5,000 kilometers, depending on the manufacturer's recommendations.
Check the spark plugs:
The spark plugs ignite the fuel in the engine. Damaged spark plugs can affect the engine's performance. Inspect the spark plugs every 5,000 kilometers. Riders who notice an engine misfire should check the spark plugs.
Inspect the fuel system:
A damaged fuel system can cause fuel leaks, which can lead to fire hazards. Inspect the fuel lines, fuel tank, and fuel filter for damage or signs of wear. Replace damaged parts immediately.
Check the tires:
Ensure the tires have enough treads. Check the tires for bulges, cracks, or punctures. Replace the tires if they are worn out.
When sourcing 125ccm engines, buyers need to consider various factors to ensure they meet the needs of their customers and business. Here are some of the factors to look out for:
Engine Type:
For many buyers, the type of engine is quite crucial. This is because each type of engine offers different benefits. Buyers should consider going for 4-stroke engines. This is because they are more fuel efficient, quieter, and have lower emissions compared to 2-stroke engines.
Fuel Type:
Buyers should consider the type of fuel the engine uses. Most 125cc engines require petrol or gasoline. However, some may run on diesel or alternative fuels. When sourcing, buyers should ensure the engines use readily available fuel.
Cooling System:
Another important factor buyers should consider is the cooling system. This is important because the cooling system affects the engine’s performance. Some 125cc engines are air-cooled, while others are water-cooled. Air-cooled engines are more common and require less maintenance. On the other hand, water-cooled engines offer better temperature control.
Torque and Power Output:
When sourcing, buyers should consider the power output and torque of the engines. This is important as it allows the buyer to select engines that are suitable for different riding styles and applications. For instance, some engines have higher power output suitable for sports and fast riding, while others have lower power output that is suitable for casual and commuting purposes.
Transmission:
Buyers should choose between manual and automatic transmission according to their customer’s preferences. It is important to note that manual transmission offers more control over power delivery, while automatic transmission is simpler and easier to use.
Emissions Standards:
Buyers should ensure that the engines comply with the local regulations emissions standards. Compliant engines emit fewer pollutants and are friendlier to the environment.
Maintenance Requirements:
Buyers should consider the maintenance requirements of the engines. It is advisable to go for engines that require minimal maintenance. Additionally, buyers should check the availability of spare parts and service requirements of the engines they want to source.
Brand Reputation:
Last but not least, buyers should consider brand reputation. It is advisable to source engines from reputable brands that are known to offer quality products and reliable customer services.
Replacing a 125cc engine can be a complex process, but it can be done with the right tools and mechanical knowledge. Here's a general guide on how to replace a 125cc engine:
First, gather the necessary tools for the operation. These include wrenches, sockets, screwdrivers, pliers, a torque wrench, an engine hoist or stand (for larger engines), and possibly specialty tools depending on the specific engine model.
Once the tools are ready, go ahead and disconnect the battery. This ensures safety during the process.
Find the suitable engine for replacement. This could be the old engine (after rebuilding or overhauling) or a new one. Ensure that the engine being installed is compatible with the 125cc engine mounts and exhaust system.
Start by draining the engine oil and coolant (if applicable) from the old engine. This will prevent any spills or leaks during the replacement process.
Remove the air intake system, exhaust system, and cooling system (if applicable) from the old engine.
Disconnect the electrical wiring harness from the old engine. Take note of the connections to ensure proper reinstallation on the new engine.
Remove the engine from the chassis by loosening and removing the engine mounting bolts. Use an engine hoist or stand to support the engine during this process.
Install the new or rebuilt 125cc engine into the chassis. Reinstall the engine mounting bolts and tighten them to the manufacturer's specifications.
Reconnect the electrical wiring harness to the new engine, following the notes taken during disconnection.
Reinstall the air intake system and exhaust system. Ensure proper sealing and fitment to prevent leaks.
Refill the engine with oil and coolant (if applicable) to the recommended levels.
Perform a final check to ensure all connections, hoses, and mounts are properly installed and tightened.
Start the engine and check for any unusual noises, leaks, or issues. Allow the engine to reach operating temperature and ensure all systems are functioning correctly.
Once everything is working as it should, close up any engine covers or access panels that were opened during the replacement process.
It's important to consult the specific service manual for the vehicle or engine in question, as procedures and details may vary. If unsure, it's always recommended to seek professional assistance for engine replacements.
Q: How many kilometers can a 125cc engine last?
A: The distance a 125cc engine can cover depends on several factors. These factors include the condition of the engine, its maintenance, and its riding habits. Generally, a well-maintained 125cc engine can cover up to 80,000 miles. This is equivalent to approximately 128,748 kilometers. However, the number can differ.
Q: Is a 125cc engine good for beginners?
A: Yes, 125cc is good for beginners. This is because 125cc offers a good balance of power and control. Riders will have enough power to accelerate and keep up with traffic. At the same time, they will have enough control to handle the bike easily.
Q: How fast can a 125ccm engine go?
A: A standard 125cc motorcycle can reach speeds of 110 km/h. This is equivalent to 68 mph. However, the top speed can vary based on several factors. These factors include the bike's design, the rider's weight, and the riding conditions.
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