2024 Yamaha YZ125X Owner’s Manual

The 2024 Yamaha YZ125X is the most advanced off-road motorcycle ever made. This high-performance machine is made to take on the toughest trails and tracks. It combines cutting-edge technology with Yamaha’s long history of success. The YZ125X has a powerful 125cc two-stroke engine that gives it exciting bursts of power, making it perfect for crossing different terrains quickly and precisely. Its lightweight frame and modern suspension system give it great handling, so riders can confidently take on difficult terrain. Whether you’re an experienced trail rider or a professional motocross rider, the 2024 Yamaha YZ125X offers an unmatched riding experience that pushes limits and redefines off-road mastery.

SAFETY INFORMATION

Be sure to read this manual carefully and com-pletely in order to operate the machine safely and correctly prior to riding the Yamaha ma-chine, and take care to maintain it properly and operate it safely.

FOR SAFETY, BE SURE TO OBEY THE FOLLOWING:
Be a Responsible Owner As the vehicle’s owner, you are responsible for the safe and proper operation of your motorcy-cle. Motorcycles are single-track vehicles. Their safe use and operation are dependent upon the use of proper riding techniques as well as the expertise of the operator. Every operator should know the following requirements before riding this motorcycle.

He or she should:

1. Obtain thorough instructions from a compe-tent source on all aspects of motorcycle op-eration.
2. Observe the warnings and maintenance re-quirements in this manual.
3. Obtain qualified training in safe and proper riding techniques.
4. Obtain professional technical service as indi-cated in this manual and/or when made nec-essary by mechanical conditions.
5. Never operate a motorcycle without proper training or instruction. Take a training course. Beginners should receive training from a cer-tified instructor. Contact an authorized mo-torcycle dealer to find out about the training courses nearest you.

Safe Riding
Perform the pre-operation checks each time you use the vehicle to make sure it is in safe op-erating condition. Failure to inspect or maintain the vehicle properly increases the possibility of an accident or equipment damage. Refer to “PRE-OPERATION INSPECTION AND MAIN-TENANCE” on page 3-5 for a list of pre-opera-tion checks.

1. This motorcycle is designed for off-road use only, therefore, it is illegal to operate it on public streets, roads, or highways, even a dirt or gravel one. Off-road use on public lands may be illegal. Please check local reg-ulations before riding.
2. This motorcycle is designed to carry the operator only. No passengers.
3. The failure of motorists to detect and recog-nize motorcycles in traffic is the predominat-ing cause of automobile/motorcycle accidents. Many accidents have been caused by an automobile driver who did not see the motorcycle. Making yourself con-spicuous appears to be very effective in re-ducing the chance of this type of accident.
   Therefore:
   • Wear a brightly colored jacket.
   • Use extra caution when you are approaching and passing through intersections, since in-tersections are the most likely places for mo-torcycle accidents to occur.
   • Ride where other motorists can see you. Avoid riding in another motorist’s blind spot.
   • Never maintain a motorcycle without proper knowledge. Contact an authorized motorcy-cle dealer to inform you on basic motorcycle maintenance. Certain maintenance can only be carried out by certified staff.
4. Many accidents involve inexperienced oper-ators.
   • Make sure that you are qualified and that you only lend your motorcycle to other qualified operators.
   • Know your skills and limits. Staying within your limits may help you to avoid an acci-dent.
   • We recommend that you practice riding your motorcycle until you have become thorough-ly familiar with the motorcycle and all of its controls.
5. Many accidents have been caused by error of the motorcycle operator. A typical error made by the operator is veering wide on a turn due to excessive speed or under corner-ing (insufficient lean angle for the speed). Never travel faster than warranted by condi-tions.
6. Ride cautiously in unfamiliar areas. You may encounter hidden obstacles that could cause an accident.
7. The posture of the operator is important for proper control. The operator should keep both hands on the handlebar and both feet on the operator footrests during operation to maintain control of the motorcycle.
8. Never ride under the influence of alcohol or other drugs.
9. Be sure the transmission is in neutral before starting the engine.

Protective Apparel
The majority of fatalities from motorcycle acci-dents are the result of head injuries. The use of a safety helmet is the single most critical factor in the prevention or reduction of head injuries.

1. Always wear an approved helmet.
2. Wear a face shield or goggles. Wind in your unprotected eyes could contribute to an im-pairment of vision that could delay seeing a hazard.
3. The use of a jacket, heavy boots, trousers, gloves, etc., is effective in preventing or re-ducing abrasions or lacerations.
4. Never wear loose-fitting clothes, otherwise they could catch on the control levers, foot-rests, or wheels and cause injury or an acci-dent.
5. Always wear protective clothing that covers your legs, ankles, and feet. The engine or ex-haust system become very hot during or af-ter operation and can cause burns.

Avoid Carbon Monoxide Poisoning
All engine exhaust contains carbon monoxide, a deadly gas. Breathing carbon monoxide can cause headaches, dizziness, drowsiness, nau-sea, confusion, and eventually death. Carbon Monoxide is a colorless, odorless, tasteless gas which may be present even if you do not see or smell any engine exhaust. Deadly levels of carbon monoxide can collect rapidly and you can quickly be overcome and unable to save yourself. Also, deadly levels of carbon monoxide can linger for hours or days in en-closed or poorly ventilated areas. If you experi-ence any symptoms of carbon monoxide poisoning, leave the area immediately, get fresh air, and SEEK MEDICAL TREATMENT.

1. Do not run engine indoors. Even if you try to ventilate engine exhaust with fans or open windows and doors, carbon monoxide can rapidly reach dangerous levels.
2. Do not run engine in poorly ventilated or par-tially enclosed areas such as barns, garages, or carports.
3. Do not run engine outdoors where engine exhaust can be drawn into a building through openings such as windows and doors.

Genuine Yamaha Accessories
Choosing accessories for your vehicle is an im-portant decision. Genuine Yamaha accessories, which are available only from a Yamaha dealer, have been designed, tested, and approved by Yamaha for use on your vehicle. Many companies with no connection to Yamaha manufacture parts and accessories or offer other modifications for Yamaha vehicles. Yamaha is not in a position to test the products that these aftermarket companies produce. Therefore, Yamaha can neither endorse nor rec-ommend the use of accessories not sold by Yamaha or modifications not specifically rec-ommended by Yamaha, even if sold and in-stalled by a Yamaha dealer.

Aftermarket Parts, Accessories, and Modifications
While you may find aftermarket products similar in design and quality to genuine Yamaha acces-sories, recognize that some aftermarket acces-sories or modifications are not suitable because of potential safety hazards to you or others. In-stalling aftermarket products or having other modifications performed to your vehicle that change any of the vehicle’s design or operation characteristics can put you and others at great-er risk of serious injury or death. You are re-sponsible for injuries related to changes in the vehicle. Keep the following guidelines in mind, as well as those provided under “Loading” when mount-ing accessories.

1. Never install accessories that would impair the performance of your motorcycle. Care-fully inspect the accessory before using it to make sure that it does not in any way reduce ground clearance or cornering clearance, limit suspension travel, steering travel or control operation.
   • Accessories fitted to the handlebar or the front fork area can create instability due to improper weight distribution. If accessories are added to the handlebar or front fork area, they must be as lightweight as possible and should be kept to a minimum.
   • Bulky or large accessories may seriously af-fect the stability of the motorcycle. Wind may attempt to lift the motorcycle, or the motor-cycle may become unstable in cross winds.
   • Certain accessories can displace the opera-tor from his or her normal riding position. This improper position limits the freedom of movement of the operator and may limit con-trol ability, therefore, such accessories are not recommended.
2. Use caution when adding electrical accesso-ries. If electrical accessories exceed the ca-pacity of the motorcycle’s electrical system, an electric failure could result, which could cause a dangerous loss of lights or engine power.

Aftermarket Tires and Rims
The tires and rims that came with your motorcy-cle were designed to match the performance capabilities and to provide the best combina-tion of handling, braking, and comfort. Other tires, rims, sizes, and combinations may not be appropriate. Refer to “CHECKING THE TIRES” on page 3-24 for tire specifications and more in-formation on replacing your tires.

Transporting the Motorcycle
Be sure to observe following instructions before transporting the motorcycle in another vehicle.

1. Remove all loose items from the motorcycle.
2. Check that the fuel cock (if equipped) is in the “OFF” position and that there are no fuel leaks.
3. Point the front wheel straight ahead on the trailer or in the truck bed, and choke it in a rail to prevent movement.
4. Shift the transmission in gear (for models with a manual transmission).
5. Secure the motorcycle with tie-downs or suitable straps that are attached to solid parts of the motorcycle, such as the frame or upper front fork triple clamp (and not, for ex-ample, to rubber-mounted handlebars or turn signals, or parts that could break). Choose the location for the straps carefully so the straps will not rub against painted sur-faces during transport.
6. The suspension should be compressed somewhat by the tie-downs, if possible, so that the motorcycle will not bounce exces-sively during transport.

FAQ