Honda CRF125F 2021 Owner's Manual
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Honda CRF125F 2021 Owner's Manual

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Honda CRF125F/FB
OWNER'S MANUAL
USO E MANUTENZIONE
MANUAL DEL PROPIETARIO
©
Honda Motor Co., Ltd. 2021

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Summary of Contents for Honda CRF125F 2021

  • Page 1 Honda CRF125F/FB OWNER’S MANUAL USO E MANUTENZIONE MANUAL DEL PROPIETARIO © Honda Motor Co., Ltd. 2021...
  • Page 2 IMPORTANT INFORMATION The information in this publication relates to the Honda CRF125F/FB, a single-track two- wheeled motor vehicle, powered by a spark ignited internal combustion engine and driven by a mounted rider. This motorcycle is not suitable for novice riders. This motorcycle shall only be used by trained and experienced riders.
  • Page 3 (Original instructions) All information in this publication is based on the latest production information available at the time of approval for printing. Honda Motor Co., Ltd. reserves the right to make changes at any time without notice and without incurring any obligation.
  • Page 4 As you read this manual, you will find information that is preceded by a symbol. This information is intended to help you avoid damage to your motorcycle, other property, or the environment. Pleasant riding, and thank you for choosing a Honda !
  • Page 5 • The following codes in this manual indicate each country. European direct sales Australia New Zealand • The specifications may vary with each locale. • The illustrations herein are based on the ED type. • This vehicle pictured in this owner’s manual may not match your actual vehicle.

  • Page 6: A Few Words About Safety

    A FEW WORDS ABOUT SAFETY Your safety, and the safety of others, is very important. And operating this motorcycle safely is an important responsibility. To help you make informed decisions about safety, we have provided operating procedures and other information on labels and in this manual. This information alerts you to potential hazards that could hurt you or others.
  • Page 7 These signal words mean: You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions. You CAN be KILLED or SERIOUSLY HURT if you don’t follow instructions. You CAN be HURT if you don’t follow instructions. • Safety Headings — such as Important Safety Reminders or Important Safety Precautions. •...
  • Page 8 OPERATION page page 1 MOTORCYCLE SAFETY 39 ESSENTIAL INDIVIDUAL COMPONENTS IMPORTANT MESSAGE TO PARENTS IGNITION SWITCH IMPORTANT SAFETY START BUTTON INFORMATION ENGINE STOP SWITCH PROTECTIVE APPAREL RIDING POSITION AND SAFETY EQUIPMENT LOAD LIMITS AND GUIDELINES LABELS 19 PARTS LOCATION INDICATORS 24 MAJOR COMPONENTS (Information you need to operate this motorcycle)
  • Page 9 page page 41 FEATURES 43 OPERATION (Not required for operation) PRE-RIDE INSPECTION LEFT SIDE COVER STARTING THE ENGINE SEAT RUNNING-IN RIDING BRAKING PARKING ANTI-THEFT TIPS...

  • Page 10: Maintenance

    MAINTENANCE page page 53 MAINTENANCE FRONT SUSPENSION THE IMPORTANCE OF REAR SUSPENSION MAINTENANCE SIDE STAND MAINTENANCE SAFETY 96 CLEANING SAFETY PRECAUTIONS MAINTENANCE SCHEDULE 99 TRANSPORTING TOOL KIT SERIAL NUMBERS 101 STORAGE GUIDE AIR CLEANER STORAGE CRANKCASE BREATHER REMOVAL FROM STORAGE ENGINE OIL SPARK PLUG 104 TAKING CARE OF THE...

  • Page 11: Motorcycle Safety

    Your child’s safety is very important to bicycle before getting on a motorcycle. Can Honda. That’s why we urge you to read this message before you let any young person your youngster judge speeds and distances ride this motorcycle.
  • Page 12 Instruction and Supervision SUPERVISION is another important obligation of parents. Even after youngsters If you decide that your youngster is ready to have become skilled off-road riders, they safely operate this motorcycle, make sure should always ride with adult supervision. It both of you carefully read and understand helps to regularly remind young riders of the Owner’s Manual before riding.

  • Page 13: Important Safety Information

    IMPORTANT SAFETY Always Wear a Helmet INFORMATION It’s a proven fact: helmets significantly reduce the number and severity of head Your motorcycle can provide many years of injuries. So always wear an approved service and pleasure – if you take motorcycle helmet.
  • Page 14 Ride Off-Road Only Take Time to Learn and Practice Your motorcycle is designed and Developing appropriate off-road riding manufactured for off-road use only. The skills is important to your safety and is a tyres are not made for pavement, and the gradual, step-by-step process.
  • Page 15 Never exceed load limits, and only use conditions warrant. Remember that alcohol, accessories that have been approved by drugs, fatigue and inattention can Honda for this motorcycle. See page 8 for significantly reduce your ability to make more details. good judgements and ride safely.

  • Page 16: Protective Apparel

    PROTECTIVE APPAREL Helmets and Eye Protection For your safety, we strongly recommend Your helmet is your most important piece of that you always wear an approved riding gear because it offers the best motorcycle helmet, eye protection, boots, protection against head injuries. A helmet gloves, trousers, and a long-sleeved jersey, should fit your head comfortably and have a shirt or jacket whenever you ride.
  • Page 17 RIDING POSITION AND SAFETY EQUIPMENT Sit on the vehicle as shown below, keeping your hands on the handlebars and feet on the footpegs. Helmet and Eye Protection Off-road motorcycle gloves Long-sleeved apparel and Protector Riding trousers with Protector Off-road motorcycle boots...

  • Page 18: Load Limits And Guidelines

    LOAD LIMITS AND GUIDELINES Loading Your Honda was designed as a rider-only How much weight you put on your motorcycle. It was not designed to carry a motorcycle, and how you load it, are passenger or cargo. A passenger or cargo important to your safety.
  • Page 19 Load Limits • Keep cargo small and light. Make sure it Following are the load limits for your cannot easily be caught on brush or other motorcycle: objects, and that it does not interfere with Maximum weight capacity: your ability to shift position to maintain CRF125F: 80 kg (176 lb) balance and stability.
  • Page 20 Modifying your motorcycle or using non- We strongly recommend that you use only Honda accessories can make your Honda Genuine Accessories that have been motorcycle unsafe. Before you consider specifically designed and tested for your making any modifications or adding an motorcycle.
  • Page 21 Because safety, vehicle movement, and clearance must be taken into consideration, you must consult your tyre maker or Honda dealer before changing your tyre model type. Removing or modifying your exhaust...
  • Page 22 LABELS There is a specific symbol on each label. The meanings of each symbol and label are The following pages describe the label as follows. locations and their meanings. Some labels warn you of potential hazards that could cause serious injury. Others provide important safety information.
  • Page 23 Read instructions contained in Owner’s Manual carefully. Read instructions contained in Shop Manual carefully. In the interest of safety, take the motorcycle to be serviced only by your dealer. DANGER (with RED background) You WILL be KILLED or SERIOUSLY HURT if you don’t follow instructions.
  • Page 24 BATTERY LABEL DANGER • Keep flames and sparks away from the battery. The battery produces explosive gas that can cause an explosion. • Wear eye protection and rubber gloves when handling the battery to avoid risk of burns or loss of eyesight if exposed to battery electrolyte.
  • Page 25 USE CAUTION LABEL Operator only. No passengers. This vehicle is designed and manufactured for off- road use only. Operation on public streets, roads, or highways is illegal. Children should only use this vehicle under the permanent supervision of an adult responsible of their safety.
  • Page 26 REAR CUSHION LABEL GAS FILLED Do not open. Do not heat. CE MARK (ED type only) CRF125F: CRF125F: Engine net power: 6.7 kW Machine mass: 88 kg CRF125FB: Engine net power: 6.7 kW CRF125FB: Machine mass: 90 kg UKCA MARK (ED type only) Some vehicles do not have UKCA mark...
  • Page 27 USE CAUTION LABEL BATTERY LABEL REAR CUSHION LABEL DRIVE CHAIN LABEL...
  • Page 28 CE MARK (ED type only) FUEL LABEL (ED type only) CRF125F: UKCA MARK (ED type only) CRF125FB:...

  • Page 29: Parts Location

    PARTS LOCATION Ignition switch Fuel reserve indicator front brake fluid reservoir Clutch lever Engine stop switch Front brake lever Throttle grip Start button Fuel fill cap Ignition indicator PGM-FI malfunction indicator lamp (MIL)
  • Page 30 Kickstarter Engine oil fill cap/dipstick Spark plug Spark arrester Footpeg Engine oil drain bolt Rear brake pedal...
  • Page 31 Battery Main fuse Sub fuse Air cleaner Front brake caliper Drive chain Shift lever Crankcase breather tube Side stand Footpeg...
  • Page 32 INDICATORS The indicators are equipped to the locations as shown in the illustrations. Their functions are described in the tables. (3) Fuel reserve indicator (1) PGM-FI malfunction indicator lamp (MIL) (2) Ignition Indicator...
  • Page 33 (Ref.No.) Description Function (1) PGM-FI malfunction Lights when there is any abnormality in the PGM-FI indicator lamp (MIL) (Programmed Fuel Injection) system. The indicator should also light for a few seconds and then go off when the ignition switch is turned to the (ON) position with the engine stop switch in (RUN) position.

  • Page 34: Major Components

    This motorcycle has a hydraulic front disc brake. The recommended brake fluid is Honda As the brake pads wear, brake fluid level DOT 3 or DOT 4 brake fluid from a sealed drops.
  • Page 35 Adjusting the Front Brake Lever Position: If brake lever freeplay is not within this Never use adjusters other than those range, see your dealer. designed for this motorcycle. Install a new adjuster from the lever side with the lock nut under the head of the adjuster. 1.
  • Page 36 Rear Brake Adjusting the Rear Brake Pedal Freeplay: 1. Place the motorcycle on its side stand. Adjusting the Rear Brake Pedal Height: 2. Measure the distance the rear brake 1. Place the motorcycle on its side stand. pedal (3) moves before the brake starts 2.
  • Page 37 Adjust by turning the rear brake adjusting nut a half-turn at a time. Make sure the cut- out on the adjusting nut is seated on the brake arm pin (5) after making final freeplay adjustment. 4. Apply the brake several times and check for free wheel rotation after the brake pedal is released.
  • Page 38 CLUTCH 1. Pull back the rubber dust cover (2). 2. Loosen the lock nut (3) and turn the Clutch adjustment may be required if the clutch cable adjuster (4). Tighten the motorcycle stalls when shifting into gear or lock nut and check the adjustment. tends to creep;...
  • Page 39 4. Loosen the lock nut (5) at the lower end Other Checks: of the cable. Turn the adjusting nut (6) Check the clutch cable for kinks or signs of to obtain the specified freeplay. Tighten wear that could cause sticking or failure. the lock nut and check the adjustment.
  • Page 40 FUEL Fuel Tank The fuel tank capacity: (0.98 US gal, 0.81 Imp gal) To open the fuel fill cap (1), pull out the breather tube (2) from the steering stem nut (3). Then turn the fuel fill cap counterclockwise. Do not overfill the tank. There should be no fuel in the filler neck (4).
  • Page 41 Failure to do so is considered misuse, and damage caused by misuse is not covered by Honda’s Limited Warranty. Occasionally you may experience light spark knock while operating under heavy loads. This is no cause for concern, it simply...
  • Page 42 (gasohol), be sure it’s octane rating is at least as high as that recommended by • Damage the rubber tubes of the fuel line. Honda. Do not use petrol that contains • Cause corrosion of the fuel tank. more than 10 % ethanol.

  • Page 43: Engine Oil

    ENGINE OIL 5. Reinstall the oil fill cap/dipstick. Check Engine Oil Level Check for oil leaks. Check the engine oil level each day before operating the motorcycle. The oil fill cap/dipstick (1) is at the rear of Running the engine with insufficient oil can the right crankcase cover and contains a cause serious engine damage.

  • Page 44: Wheels And Tyres

    WHEELS & TYRES It is important to properly replace parts according to the replacement schedule. We The tyres are the only point of contact recommend that you leave this work to the between your motorcycle and the road. experts with the proper equipment and Safety under any riding conditions is experience.
  • Page 45 Air Pressure Tyres age, even if they have not been used or have only been used occasionally. Properly inflated tyres are most important Cracking of the tread and sidewall rubber, for safety, and will provide the best sometimes accompanied by carcass combination of handling, tread life, and deformation, is an evidence of ageing.
  • Page 46 Inspection Always check air pressure when your tyres are ‘‘cold.’’ If you check air pressure when Whenever you check the tyre pressures, your tyres are ‘‘warm’’ – even if your you should also examine the tyre treads and motorcycle has only been ridden for a few sidewalls for wear, damage, and foreign miles –...
  • Page 47 Tread Wear Tube Repair and Replacement You must periodically confirm the tread If a tube is punctured or damaged, you wear depth. should replace it as soon as possible. A tube Replace tyres before tread depth (1) at the that is repaired may not have the same centre of the tyre reaches the following reliability as a new one, and it may fail while limit:...
  • Page 48 Wheel & Tyre Replacement Used tyres should not be installed if the previous usage record is unknown. The tyres that came on your motorcycle were designed to match the performance The recommended tyres for your capabilities of your motorcycle and provide motorcycle are: the best combination of handling, braking, Front: CRF125F: 70/100-17M/C 40M...

  • Page 49: Essential Individual Components

    ESSENTIAL INDIVIDUAL COMPONENTS IGNITION SWITCH The ignition switch (1) is located in front of handlebar. The ignition switch is used to prevent unauthorized use of the motorcycle. Before riding, insert the key and turn it to (ON) position. After parking the motorcycle, remove the key.

  • Page 50: Start Button

    START BUTTON ENGINE STOP SWITCH The start button (1) is next to the throttle The engine stop switch (1) is next to the grip. throttle grip. When the start button is pressed, the When the switch is in the (RUN) starter motor cranks the engine.

  • Page 51: Left Side Cover

    FEATURES (Not required for operation) LEFT SIDE COVER The left side cover (1) must be removed for air cleaner and sub fuse maintenance. Removal: 1. Remove the bolt A (2), bolt B (3) and collar (4). 2. Pull out the prong (5) from the rubber grommet (6), and the boss (7) from the hole (8) on the shroud.
  • Page 52 SEAT The seat (1) must be removed for battery and main fuse maintenance. Removal: 1. Remove the bolts (2) and collars (3). 2. Remove the seat backward. Installation: 1. Insert the front recess (4) into the front prong (5) and the rear prong (6) into the rear recess (7).

  • Page 53: Operation

    OPERATION PRE-RIDE INSPECTION • Engine oil level – add engine oil if For your safety, it is very important to take a required (page 33). Check for leaks. few moments before each ride to walk • Fuel level – fill fuel tank when necessary around your motorcycle and check its (page 30).
  • Page 54 • Throttle – check for smooth opening and full closing in all steering positions. Adjust freeplay if necessary (pages 73 – 74). • Indicators – check for normal operation of the indicators (page 22 – 23). • Clutch – check operation, and adjust if necessary (pages 28 –...

  • Page 55: Starting The Engine

    STARTING THE ENGINE Preparation Always follow the proper starting procedure Before starting, insert the key and turn the described below. ignition switch to (ON), and confirm the following: This motorcycle can be started with the • The transmission is in neutral. transmission in gear by disengaging the •...
  • Page 56 Starting Procedure 2. If you cannot start the engine, open the throttle slightly (about 3 mm (0.1 in), This motorcycle has a fuel-injected engine. without freeplay). Follow the procedure indicated below. about 3 mm (0.1 in), Any Air Temperature without freeplay 1.
  • Page 57 Flooded Engine Ignition Cut Off (Using the start button) Your motorcycle is designed to If the engine fails to start after repeated automatically stop the engine and fuel pump attempts, it may be flooded with excess fuel. if the motorcycle is over-turned (a banking To clear a flooded engine, open the throttle sensor cuts off the ignition system).
  • Page 58 RUNNING-IN Help assure your motorcycle’s future reliability and performance by paying extra attention to how you ride during the first operating day or 25 km (15 miles). During this period, avoid full-throttle starts and rapid acceleration.
  • Page 59 RIDING 1. After the engine has been warmed up, the motorcycle is ready for riding. Review Motorcycle Safety (pages 1 – 18) 2. While the engine is idling, pull in the before you ride. clutch lever and depress the shift lever Make sure the side stand is fully retracted to shift into 1st (low) gear.
  • Page 60 5. Raise the shift lever to shift to a higher • Do not downshift when traveling at a gear and depress the shift lever to shift speed that would force the engine to to a lower gear. Each stroke of the shift overrev in the next lower gear;...
  • Page 61 BRAKING • When riding in wet or rainy conditions, or For normal braking, gradually apply both on loose surfaces, the ability to maneuver the front and rear brakes while and stop will be reduced. All of your downshifting to suit your road speed. actions should be smooth under these For maximum deceleration, close the conditions.

  • Page 62: Anti-Theft Tips

    PARKING ANTI-THEFT TIPS Touching the brakes after long hours or 1. Be sure the registration information for heavy usage, can cause burn injuries. Also, your motorcycle is accurate and current. depending on the section, the engine can be 2. Park your motorcycle in a locked garage hot, and cause burn injuries.

  • Page 63: The Importance Of Maintenance

    MAINTENANCE THE IMPORTANCE OF Frequent servicing of the air cleaner is MAINTENANCE especially important to help you avoid a possible costly engine repair. A well-maintained motorcycle is essential for safe, economical, and trouble-free riding. If your motorcycle overturns or becomes It will also help reduce air pollution.

  • Page 64: Maintenance Safety

    Wheel removal should normally be handled only by a Honda technician or other qualified mechanic; instructions are included in this manual only to assist in emergency service.

  • Page 65: Safety Precautions

    Allow the engine, muffler, brakes and To ensure the best quality and reliability, other high-temperature parts to cool use only new Honda Genuine Parts or their before servicing as you can get burned. Injury from moving parts. equivalents for repair and replacement.

  • Page 66: Maintenance Schedule

    In the interest of safety, we recommend these items be serviced only by your dealer. ✽✽ Honda recommends that your dealer should road test your motorcycle after each periodic maintenance is carried out. NOTE: (1) Service more frequently when ridden in wet or dusty conditions.
  • Page 67 FREQUENCY WHICHEVER INITIAL REGULAR MAINT. INTERVAL COMES MAINT. FIRST  1,000 2,000 3,000 4,000 REFER 1,200 1,800 2,400 ITEMS NOTE MONTH PAGE ✽ FUEL LINE – ✽✽ FUEL FILTER Every 8,000 km (4,800 mi): R – ✽ THROTTLE OPERATION AIR CLEANER NOTE (1) CRANKCASE BREATHER SPARK PLUG...
  • Page 68 FREQUENCY WHICHEVER INITIAL REGULAR MAINT. INTERVAL COMES MAINT. FIRST  1,000 2,000 3,000 4,000 REFER 1,200 1,800 2,400 ITEMS NOTE MONTH PAGE DRIVE CHAIN NOTE (1) I, L Every 500 km (300 mi) or every 3 months: I,L DRIVE CHAIN SLIDER BRAKE FLUID NOTE (2) BRAKE SHOES/PADS WEAR...
  • Page 69 TOOL KIT The spark plug wrench (1) and its handle (2) are stored in the tool bag (3). (1) Spark plug wrench (2) Handle (3) Tool bag...
  • Page 70 SERIAL NUMBERS The frame and engine serial numbers are The frame number (1) is stamped on the left required when registering your motorcycle. side of the steering head. They may also be required by your dealer The engine number (2) is stamped on the when ordering replacement parts.

  • Page 71: Air Cleaner

    AIR CLEANER 3. Unhook the set spring (3), take care to avoid bending the set spring and set Refer to the Safety Precautions on page 55. spring holder (4). The air cleaner should be serviced at 4. Remove the air cleaner (5). regular intervals (page 57).
  • Page 72 5. Remove the air cleaner holder (6) from the air cleaner (5). 6. Wash the air cleaner in clean, nonflammable or high flash point solvent and let it dry thoroughly. Never use petrol or low flash point solvents for cleaning the air cleaner. A fire or explosion could result.
  • Page 73 9. Clean the inside of the air cleaner housing. (10) 10. Apply a thin coat of grease to the sealing surface of the air cleaner. 11. Install the air cleaner assembly by inserting the upper tab (9) on the cleaner into the upper hole (10) in the air cleaner housing, and the lower tab (11) into the lower hole (12).

  • Page 74: Crankcase Breather

    CRANKCASE BREATHER Refer to the Safety Precautions on page 55. Service more frequently if your motorcycle is ridden in the rain or often at full throttle. If the drain tube overflows, the air filter may become contaminated with engine oil causing poor engine performance.
  • Page 75 They may service label affect lubrication and clutch performance. Viscosity SAE 10W-30 JASO T 903 standard Suggested Oil NOT RECOMMENDED RECOMMENDED Honda ‘‘4-STROKE MOTORCYCLE OIL’’ or an equivalent. • Do not use non-detergent, vegetable, or castor based racing oils.
  • Page 76 Viscosity: Viscosity grade of engine oil should be based on average atmospheric temperature in your riding area. The following provides a guide to the selection of the proper grade or viscosity of oil to be used at various atmospheric temperatures.
  • Page 77 JASO T 903 standard The JASO T 903 standard is an index for engine oils for 4-stroke motorcycle engines. There are two classes: MA and MB. Oil conforming to the standard is labeled on the oil container. For example, the following label shows the MA classification.
  • Page 78 Engine Oil Changing the oil requires a torque wrench. If you do not have it and the necessary skill, Engine oil quality is the chief factor we recommend that you have your dealer affecting engine service life. Change the perform this service. engine oil as specified in the maintenance schedule (page 57).
  • Page 79 1. Place a drain pan under the crankcase. 2. To drain the oil, remove the oil fill cap/ dipstick, oil drain bolt (1), and sealing washer (2). 3. Install the oil drain bolt with a new sealing washer. Oil drain bolt torque: 24 N·m (2.4 kgf·m, 18 lbf·ft) 4.
  • Page 80 5. Install the oil fill cap/dipstick. 6. Start the engine and let it idle for 3 – 5 minutes. 7. 2 – 3 minutes after stopping the engine, check that the oil level is at the upper level mark on the oil fill cap/dipstick with the motorcycle upright on firm, level ground.
  • Page 81 SPARK PLUG Refer to the Safety Precautions on page 55. Never use a spark plug with an improper heat range. Severe engine damage could Recommended plug: result. Standard: CPR6EA-9 (NGK) 1. Disconnect the spark plug cap. 2. Clean any dirt from around the spark For most riding conditions this spark plug plug base.
  • Page 82 6. Check the spark plug gap (1) using a 7. Make sure the plug washer is in good wire-type feeler gauge. If adjustment is condition. necessary, bend the side electrode (2) 8. With the plug washer attached, thread carefully. the spark plug in by hand to prevent The gap should be: cross-threading.

  • Page 83: Throttle Operation

    THROTTLE OPERATION Refer to the Safety Precautions on page 55. Cable Inspection: 1. Check for smooth rotation of the throttle grip from the fully open to the fully closed position at both full steering positions. 2. Inspect the condition of the throttle cables (1) from the throttle grip down to the throttle body.
  • Page 84 Freeplay Adjustment: 1. Adjust freeplay with the throttle cable adjuster (1). Measured in grip rotation, the standard throttle grip freeplay is: 2 – 6 mm (0.1 – 0.2 in) 2. To adjust the freeplay, slide the throttle cable boot (2), then loosen the lock nut (3) and turn the cable adjuster.

  • Page 85: Spark Arrester

    SPARK ARRESTER 1. Remove the bolts (1), the spark arrester (2), and the gasket (3) from the muffler Refer to the Safety Precautions on page 55. (4). The exhaust system spark arrester must be 2. Use a brush to remove carbon deposits purged of accumulated carbon periodically from the spark arrester screen (5).

  • Page 86: Drive Chain

    DRIVE CHAIN 3. Roll the motorcycle forward. Stop. Check the drive chain slack. Repeat this Refer to the Safety Precautions on page 55. procedure several times. Drive chain slack should remain constant. If the The service life of the drive chain (1) is chain is slack only in certain sections, dependent upon proper lubrication and some links are kinked and binding.
  • Page 87 4. Check the chain slider (2) for wear. 5. Measure a section of the drive chain to If the depth (3) of the chain slider determine whether the chain is worn reaches the service limit, have your beyond its service limit. Remove the dealer replace the chain slider.
  • Page 88 6. Inspect the sprocket teeth for possible Adjustment: wear or damage. If the drive chain requires adjustment, the procedure is as follows: 1. Place a support block under the engine Damaged Sprocket Worn Sprocket to raise the rear wheel off the ground. Teeth Teeth 2.
  • Page 89 4. Turn the adjusting nut (3) on both the If a torque wrench is not used for this right and left chain adjusters an equal installation, see your dealer as soon as number of turns to increase or decrease possible to verify proper assembly. chain slack.
  • Page 90 Removal and Cleaning: 5. Pass the chain over the sprockets and join the ends of the chain with the When the drive chain becomes dirty, it master link. should be removed and cleaned prior to For ease of assembly, hold the chain lubrication.

  • Page 91: Wheel Rims And Spokes

    WHEEL RIMS AND SPOKES Refer to the Safety Precautions on page 55. 1. Inspect the wheel rims (1) and spokes (2) for damage. 2. Tighten any loose spokes and rim lock (3). 3. Check wheel rim runout. If runout is noticeable, see your dealer for inspection.

  • Page 92: Wheel Removal

    WHEEL REMOVAL Refer to the Safety Precautions on page 55. Front Wheel Removal 1. Raise the front wheel off the ground by placing a support block under the engine. 2. Remove the axle nut (1). 3. Remove the front axle shaft (2), wheel, and side collars.
  • Page 93 Installation: If the torque wrench was not used for • Reverse the removal procedure. installation, see your dealer as soon as possible to verify proper assembly. 1. Install the side collars into the left and Improper assembly may lead to loss of right side wheel hub.
  • Page 94 Rear Wheel Removal 1. Raise the rear wheel off the ground by placing a support block under the engine. 2. Unscrew the rear brake adjuster (1). 3. Press and release the rear brake pedal and disconnect the brake rod (2) from the brake arm (3).
  • Page 95 Installation: 1. Reverse the removal procedure. Make sure that the lug (1) on the swingarm is located in the slot (2) in the brake panel. Tighten the axle nut to: 62 N·m (6.3 kgf·m, 46 lbf·ft) 2. Adjust the drive chain (pages 78 – 79). 3.

  • Page 96: Brake Pads Wear

    BRAKE PADS WEAR <FRONT BRAKE> Refer to the Safety Precautions on page 55. Brake pad wear depends upon the severity of usage, the type of riding, and road conditions. (Generally, the pads will wear faster on wet and dirty roads.) Inspect the pads at each regular maintenance interval (page 58).
  • Page 97 See your dealer for this service. When the brake service is necessary, see your dealer. Use only Honda Genuine Parts or its equivalent. (1) Arrow (2) Brake arm...
  • Page 98 BATTERY Refer to the Safety Precautions on page 55. An improperly disposed of battery can be harmful to the environment and human It is not necessary to check the battery health. electrolyte level or add distilled water as the Always confirm local regulations for battery battery is a maintenance-free (sealed) type.
  • Page 99 The battery (1) is in the battery compartment under the seat. Removal: 1. Make sure the ignition switch is OFF. 2. Remove the seat (page 42). 3. Disconnect the negative (−) terminal lead (2) from the battery. 4. Disconnect the positive (+) terminal lead (3) from the battery.

  • Page 100: Fuse Replacement

    FUSE REPLACEMENT Refer to the Safety Precautions on page 55. When frequent fuse failure occurs, it usually Blown fuse indicates a short circuit or an overload in the electrical system. See your dealer for repair. Never use a fuse with a different rating from that specified.
  • Page 101 Sub Fuse: The sub fuse (1) is located behind the left side cover. The specified fuses are: 1. Turn the ignition switch OFF before checking or replacing the fuses to prevent an accidental short-circuit. 2. Remove the left side cover (page 41). 3.
  • Page 102 Main Fuse: The main fuse (1) is located under the seat. The specified fuse is: 15 A 1. Turn the ignition switch OFF before checking or replacing the fuses to prevent an accidental short-circuit. 2. Remove the seat (page 42). 3.

  • Page 103: Front Suspension

    FRONT SUSPENSION Operating the motorcycle with loose, worn, or damaged steering or front suspension Refer to the Safety Precautions on page 55. components may adversely affect vehicle Check the fork operation by locking the handling and stability. front brake and pumping the forks up and If any suspension components appear worn down several times.

  • Page 104: Rear Suspension

    REAR SUSPENSION Refer to the Safety Precautions on page 55. Check the rear suspension periodically by careful visual examination. Note the following items: 1. Swingarm bearings (1) should be checked by pushing hard against the side of the rear wheel while the motorcycle is on a support block.

  • Page 105: Side Stand

    SIDE STAND Refer to the Safety Precautions on page 55. Check the side stand spring (1) for damage and loss of tension, and the side stand assembly for freedom of movement. If the side stand is squeaky or stiff, clean the pivot area and lubricate the pivot bolt with clean engine oil.
  • Page 106 CLEANING Clean your motorcycle regularly to protect High pressure washers (like those at coin- the surface finishes and inspect for damage, operated car washes) can damage certain wear and oil leakage. parts of your motorcycle. If you use a high pressure washer, avoid spraying the Avoid cleaning products that are not following areas:...
  • Page 107 Washing the Motorcycle 6. Test the brakes before riding the motorcycle. Several applications may be 1. Rinse the motorcycle thoroughly with necessary to restore normal braking cool water to remove loose dirt. performance. 2. Clean the motorcycle with a sponge or 7.
  • Page 108 Finishing Touches Clean the Mat Painted Surface After washing your motorcycle, consider Using plenty of water, clean the mat painted using a commercially-available spray surface with a soft cloth or sponge. Dry cleaner/polish or quality liquid or paste wax with a soft, clean cloth. to finish the job.
  • Page 109 TRANSPORTING If you use a truck or motorcycle trailer to To secure your motorcycle, brace the front transport your motorcycle, we recommend wheel against the front of the truck bed or that you follow these guidelines: trailer rail. Attach the lower ends of two straps to the tie-down hooks on your •...
  • Page 110 Check that the tie-down straps do not contact any control cables or electrical wiring. Tighten both straps until the front suspension is compressed about half-way. Too much pressure is unnecessary and could damage the fork seals. Use another tie-down strap to keep the rear of the motorcycle from moving.

  • Page 111: Storage Guide

    STORAGE GUIDE Extended storage, such as for winter, requires that you take certain steps to reduce the effects of deterioration from non-use of the motorcycle. In addition, Petrol is highly flammable and necessary repairs should be made BEFORE explosive. You can be burned or storing the motorcycle;...
  • Page 112 3. To prevent rusting in the cylinder, 4. Remove the battery. Store in an area perform the following: protected from freezing temperatures • Remove the spark plug cap from the and direct sunlight. spark plug. Using tape or string, Slow charge the battery once a month. secure the cap to any convenient 5.

  • Page 113: Removal From Storage

    REMOVAL FROM STORAGE 1. Uncover and clean the motorcycle. 2. Change the engine oil if more than 4 months have passed since the start of storage. 3. Charge the battery as required. Install the battery. 4. If your motorcycle has been stored for more than two months–drain and replace the fuel.

  • Page 114: Taking Care Of The Unexpected

    TAKING CARE OF THE UNEXPECTED IF YOU CRASH Personal safety is your first priority after a If there is minor damage, or you are unsure crash. If you or anyone else has been about possible damage, ride slowly and injured, take time to assess the severity of cautiously.

  • Page 115: Unstable Engine Operation Occurs Intermittently

    UNSTABLE ENGINE OPERATION OCCURS INTERMITTENTLY If the fuel pump filter is clogged, unstable engine operation will occur intermittently while riding. Even if this symptom occurs, you can continue to ride your motorcycle. If unstable engine operation occurs even if sufficient fuel is available, have your motorcycle inspected by your dealer as soon as possible.

  • Page 116: Specifications

    SPECIFICATIONS DIMENSIONS Overall length CRF125F: 1,770 mm (69.7 in) CRF125FB: 1,855 mm (73.0 in) Overall width CRF125F: 740 mm (29.1 in) CRF125FB: 770 mm (30.3 in) Overall height CRF125F: 1,000 mm (39.4 in) CRF125FB: 1,070 mm (42.1 in) Wheelbase CRF125F: 1,220 mm (48.0 in) CRF125FB: 1,255 mm (49.4 in) CAPACITIES...

  • Page 117: Chassis And Suspension

    ENGINE Bore and stroke 52.4 × 57.9 mm (2.06 × 2.28 in) Compression ratio 9.0 : 1 Displacement 125 cm (7.6 cu-in) Spark plug Standard CPR6EA-9 (NGK) Spark plug gap 0.8 – 0.9 mm (0.03 – 0.04 in) Idle speed 1,400 ±100 min (rpm) Valve clearance (Cold)

  • Page 118: Power Transmission

    POWER TRANSMISSION Primary reduction 3.250 Gear ratio, 1st 3.181 1.705 1.238 0.916 Final reduction CRF125F: 3.538 CRF125FB: 3.769 ELECTRICAL Battery YTZ4V 12 V – 3.0 Ah (10 HR)/3.2 Ah (20 HR) Alternator 0.125 kW / 5,000 min (rpm) FUSE Main fuse 15 A Sub fuse...
  • Page 119 NOISE LEVEL AND VIBRATIONS Noise level 76 dB(A) EN16029 Operating Conditions : Annex A Uncertainty of measurement 3 dB(A) Vibration on seat Not exceed 0.5 m/s EN1032 Operating conditions : UN R41, stationary noise Uncertainty of measurement Vibration on handlegrip Not exceed 2.5 m/s ISO5349 : 2001 Operating conditions : UN R41,...
  • Page 120 Sundiro Honda Motorcycle Co., Ltd. No. 188, Jiasong Middle Road, Manufacturer Huaxin, Qingpu District, Shanghai, China Honda Motor Europe Ltd - Aalst Office Authorized representative and importer Wijngaardveld 1 (Noord V) for EU market 9300 Aalst - Belgium Honda Motor Europe Ltd...

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Crf125fb 2021

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