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The Yamaha YBR engine is a motorcycle engine that powers the YBR125 and YBR125G bikes. The YBR125 has two versions of the YBR 125 engine, while the YBR125G has one. The engines are air-cooled, four-stroke, and single-cylinder, with a displacement of 125cc. They generate a maximum power of 9.5kW at 10,000rpm and a maximum torque of 10.2Nm at 7,000rpm. The engines use unleaded petrol with a minimum octane rating of 90. They have a compression ratio of 10.9:1 and a lubrication system of wet sump.
The YBR 125 engine has more variations depending on the variant's performance requirements, while the YBR 150 engine has a standard 150cc engine.
Regular oil changes
The oil and oil filter should be replaced every 1,000 kilometers or as advised in the owner's manual. Fresh oil lubricates engine parts, while new filters trap impurities, ensuring optimal YBR engine performance and longevity.
Air filter maintenance
Inspect the air filter at each service interval. Replace it every 5,000 kilometers or sooner if riding in dusty conditions. A clean air filter prevents dirt from entering the engine, protecting internal components like pistons and valves.
Valve clearance checks
Engine valves control air-fuel intake and exhaust. Their spacing affects engine efficiency. Valve clearance should be checked every 10,000 kilometers per the manual. Adjustments on the YBR 125cc engine ensure optimal performance over time.
Regular cooling system service
The YBR engine relies on a cooling system to prevent overheating. The coolant level should be checked, and the lines/pump should be inspected for leaks. Coolant should be replaced every 20,000 kilometers to maintain effective temperature regulation.
Tire maintenance
Tires impact engine performance. Maintain proper inflation as per the manual. Visually inspect tires for wear/damage at each fuel stop. Replace when tread is low. Well-maintained tires allow the YBR engine to run efficiently and safely.
Regular chain maintenance
The YBR engine powers the bike through a chain system. The chain should be cleaned and lubricated every 1,000 kilometers. Adjust tension as per the manual. A well-maintained chain transfers engine power smoothly, enhancing ride quality.
Regular inspection of spark plugs
Spark plugs ignite fuel in the engine. They should be inspected every 5,000 kilometers. Replace if worn or after 20,000 kilometers. Healthy spark plugs ensure efficient fuel burning, maximizing engine power and fuel efficiency.
Choosing a Yamaha YBR engine entails considering several factors to guarantee the requirements of the planned use, the motorcycle's characteristics, and the maintenance capacity.
Intended Use:
Consider the purposes the motorbike will be utilized for. A higher displacement engine may be required for longer distance traveling and highway speed retention, while a lower displacement engine may be more adequate for urban commuting and short trips, offering better fuel efficiency and lower running costs.
Performance Characteristics:
Different YBR engines offer varying performance levels. Consider aspects such as power delivery, torque characteristics, and overall smoothness. For beginner riders or those seeking a more relaxed riding experience, a YBR engine with a more linear power band and smooth throttle response may be preferable.
Fuel Efficiency:
If fuel efficiency is a significant concern, consider YBR engines known for their economical fuel consumption. Smaller displacement engines tend to offer better fuel efficiency, making them cost-effective for daily commuting and city riding.
Maintenance and Serviceability:
Consider the ease of maintenance and availability of service centers for the chosen YBR engine model. Some engines have simpler designs and fewer components, resulting in lower maintenance costs and easier DIY repairs. Additionally, ensure that authorized service centers or reliable mechanics are accessible for servicing and repairs, reducing downtime and ensuring quality maintenance.
Riding Comfort:
Consider the bike's design elements, including its seating position, suspension system, and overall ergonomics. Opt for a YBR engine model with a well-padded seat, comfortable riding posture, and suspension tuned for a smooth and comfortable ride if long-distance travel is frequent.
Budget:
Consider the initial purchase price and long-term expenses such as fuel, insurance, and maintenance. Smaller YBR engines are generally more affordable, both in terms of purchase price and running costs. Balance the budget with the desired engine performance and motorcycle features.
Replacing the Yamaha YBR 125 engine can be a complex task that typically requires mechanical expertise and specialized tools. However, here's a general guide on how to replace the engine:
Preparation
Ensure that the new YBR 125 engine is compatible with the bike model and year. Gather necessary tools such as wrenches, sockets, screwdrivers, torque wrench, and engine hoist or stand. Have a clean workspace with ample lighting and good ventilation.
Disconnecting the Battery
Turn off the ignition and disconnect the battery's negative (-) terminal to prevent electrical accidents. Disconnect the positive terminal as well, ensuring the bike's electrical system is isolated.
Draining Fluids
Drain the engine oil and coolant (if applicable) into suitable containers for recycling. This step prevents spills and reduces the engine's weight during removal.
Removing External Components
Remove any external components connected to the engine, including the air intake system, exhaust system, electrical connections, fuel lines, and cooling hoses. Take notes or pictures of the connections for reassembly.
Removing the Engine
Place the bike in a stable position, preferably on a service stand. Follow the service manual to remove the engine mounting bolts. Carefully lift the engine out of the frame using an engine hoist or suitable lifting method.
Installing the New Engine
Position the new YBR 125 engine in the frame, ensuring proper alignment with mounting points and other components. Secure the engine with mounting bolts according to the manufacturer's torque specifications.
Reconnecting Components
Reconnect all electrical connections, fuel lines, and cooling hoses as per the taken notes or pictures. Reinstall the air intake system, exhaust system, and any other external components removed earlier.
Refilling Fluids
Refill the engine with fresh oil through the recommended grade and specifications. Check the coolant level and top it up if necessary. Bleed the cooling system to remove air pockets if required.
Final Checks
Perform a thorough inspection to ensure all connections are secure, and there are no leaks or loose parts. Turn the ignition on and check the bike's electrical systems before starting the engine.
Start the Engine
Follow the manufacturer's instructions for starting a new engine for the first time. Allow it to idle and monitor for any unusual sounds or issues. Check and adjust engine parameters (if applicable) according to the service manual.
It's essential to consult the Yamaha Ybr 125 service manual for specific instructions, torque specifications, and safety precautions related to each step. If unsure, seek professional assistance to replace the engine properly.
Q1: How long does the YBR engine last?
A1: The longevity of the YBR engine depends on several factors, including how well the engine is maintained and the conditions it is used in. However, on average, the YBR engine can last up to 200,000 to 300,000 kilometers.
Q2: What is the displacement of the YBR engine?
A2: The YBR engine has a displacement of 113cc to 124cc.
Q3: Is the YBR engine good for beginners?
A3: Yes, the YBR engine is good for beginners. The YBR series of motorcycles have a smooth power delivery, and the engine's characteristics make them suitable for novice riders.
