Yamaha YZ125A1 2011 Owner's Manual

Yamaha YZ125A1 2011 manual cover
Pages 234
Year 2011
Language(s)
English en

Yamaha YZ125A1 2011 Specification

The Yamaha YZ125A1 2011 is a high-performance motocross bike designed for competitive racing and off-road enthusiasts. It features a liquid-cooled, 124cc, 2-stroke engine with reed valve induction, delivering robust power and quick throttle response. The engine is mated to a 6-speed transmission, optimized for precise gear shifts and enhanced control across varying terrains. The YZ125A1 incorporates Yamaha's patented YPVS (Yamaha Power Valve System), which adjusts exhaust port timing for improved power delivery and efficiency.

The bike's chassis is constructed from lightweight aluminum, contributing to its agility and superior handling capabilities. The suspension system is comprised of a fully adjustable KYB inverted front fork and a KYB rear shock, offering customizable settings to suit a wide range of rider preferences and track conditions. The front suspension travel is 11.8 inches, while the rear offers 12.4 inches, ensuring maximum impact absorption and ride comfort.

Braking is handled by a 250mm disc brake in the front and a 245mm disc brake in the rear, providing reliable stopping power and control. The YZ125A1's wheels are fitted with Dunlop MX51 tires, known for their excellent traction and durability on various surfaces.

Ergonomically, the Yamaha YZ125A1 2011 features a narrow seat and fuel tank design, enabling better maneuverability and rider comfort during long rides. The bike's overall dimensions include a wheelbase of 56.8 inches, a seat height of 39.3 inches, and a ground clearance of 15 inches, making it suitable for a range of rider heights and skill levels. The fuel tank capacity is 2.1 gallons, providing ample fuel for extended riding sessions. With a dry weight of approximately 207 pounds, the YZ125A1 is a lightweight yet powerful option in the motocross category, promising an exhilarating riding experience.

Yamaha YZ125A1 2011 F.A.Q.

How do I properly break in the engine of my Yamaha YZ125A1 2011?

To break in the engine, start by warming it up and then ride at varying speeds, avoiding full throttle for the first few hours. Gradually increase the load and speed over time to allow the engine to settle.

What is the recommended maintenance schedule for the Yamaha YZ125A1 2011?

Perform regular maintenance every 10 hours of riding, including checking the air filter, changing the oil, inspecting the chain, and checking tire pressure. More detailed maintenance like checking the piston and clutch should be done every 30-50 hours.

How do I troubleshoot a starting issue on my YZ125A1?

If the YZ125A1 won't start, check the spark plug for fouling, ensure there is fresh fuel in the tank, and verify that the carburetor is clean. Also, inspect the ignition system for any loose connections.

What type of oil should I use for the Yamaha YZ125A1 2011?

Use high-quality 2-stroke engine oil specifically designed for off-road motorcycles. Yamaha recommends Yamalube 2-R for optimal performance.

How can I adjust the suspension settings on my Yamaha YZ125A1 for better handling?

To adjust the suspension, start with the fork and shock settings as per the owner's manual. Adjust the compression and rebound damping to suit your weight and riding style. Test ride and make incremental changes to achieve the desired handling.

What should I do if the clutch feels stiff on my YZ125A1?

Check the clutch cable for wear or fraying and ensure it is properly lubricated. Inspect the clutch lever for free play and adjust it if necessary. If the problem persists, the clutch plates may need inspection or replacement.

How do I clean or replace the air filter on my Yamaha YZ125A1 2011?

Remove the seat and airbox cover to access the air filter. Clean the filter with a mild detergent and warm water, rinse thoroughly, and let it dry completely. Apply air filter oil before reinstalling. Replace the filter if it is damaged or excessively dirty.

What steps should I take to winterize my Yamaha YZ125A1?

To winterize your bike, clean it thoroughly, lubricate moving parts, drain the fuel system, remove the battery and store it in a cool, dry place, and cover the bike to protect it from dust and moisture.

How do I check and adjust the chain tension on my YZ125A1?

Place the bike on a stand to lift the rear wheel off the ground. Check the chain tension by measuring the slack midway between the sprockets. Adjust the chain tension by loosening the axle nut and turning the adjusters equally on both sides. Tighten the axle nut once the correct tension is achieved.

What are common signs of engine trouble in a Yamaha YZ125A1 2011?

Common signs include unusual noises, excessive smoke, loss of power, difficulty starting, or poor throttle response. Regular maintenance and timely inspections can help prevent these issues.