To make it easier for you to choose the right manual, we have compiled various information for you below, such as model designations, types, and production years.
The following models are encompassed by this manual: WR 400F, WR 426F / Yamaha Motor Corp., Ltd
2001 Yamaha WR400F
2001 Yamaha WR426F
Engine: 399.0 cc (24.35 cubic inches), Single cylinder, four-stroke, liquid cooled, 45.0 HP (32.8 kW) @ 9000 RPM,
Production year(s): 2001
Manual Language: English
Printable: Yes (with all printers)
Instant delivery/download: Your download link will appear on the checkout page after your payment is complete.
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"Troubleshoot and Download Four-Stroke Off-Road Motorcycle Manual: Explore Engine Specs, Maintenance Tips, Modifications, and More for the 2001 Yamaha WR400F and WR426F"
Looking to troubleshoot and download a comprehensive manual for your four-stroke off-road motorcycle? Look no further than the 2001 Yamaha WR400F and WR426F. These legendary machines offer thrilling rides and exceptional performance on dirt trails and motocross tracks. In this article, we will delve into the engine specifications, share interesting facts, provide maintenance intervals and tips, address common issues and solutions, suggest popular tuning tips and modifications, list available accessories and aftermarket options, offer owner reviews and opinions, and finally, provide a convenient way to get the detailed shop handbook.
Engine Specs/Technical Specifications:
• Engine Type: 4-stroke, liquid-cooled, DOHC single-cylinder
• Displacement: 400cc (WR400F) / 426cc (WR426F)
• Bore x Stroke: 92.0mm x 60.1mm (WR400F) / 95.0mm x 60.1mm (WR426F)
• Compression Ratio: 11.4:1 (WR400F) / 12.3:1 (WR426F)
• Fuel Delivery: Keihin FCR39 flat slide carburetor
• Ignition: CDI (Capacitor Discharge Ignition)
• Transmission: 5-speed constant mesh
• Final Drive: Chain
• Front Suspension: Telescopic fork, adjustable compression and rebound damping
• Rear Suspension: Monocross linkage, adjustable compression and rebound damping
• Front Brakes: Single disc
• Rear Brake: Single disc
• Front Tire: 80/100-21 (WR400F) / 90/90-21 (WR426F)
• Rear Tire: 110/100-18 (WR400F) / 120/90-18 (WR426F)
• Wheelbase: 1,485mm
• Seat Height: 960mm (WR400F) / 965mm (WR426F)
• Fuel Capacity: 8 liters
• Dry Weight: 118 kg (WR400F) / 119 kg (WR426F)
• Frame Type: Semi-double cradle
• Suspension Travel: Front - 300mm, Rear - 315mm
• Ground Clearance: 355mm
• Battery: 12V, 4Ah
• Max Power: N/A
• Max Torque: N/A
• Cooling System: Liquid-cooled
• Exhaust: High-mounted
• Clutch: Wet, multiplate
• Front Suspension Travel: 300mm
• Rear Suspension Travel: 315mm
• Front Brake Type: Hydraulic single disc
• Rear Brake Type: Hydraulic single disc
• Front Wheel Size: 21"
• Rear Wheel Size: 18"
• Manufacturer Warranty: N/A
Facts and Details:
- The WR400F and WR426F models were highly regarded as reliable and capable off-road motorcycles in their time.
- Both models feature a strong and torquey 4-stroke engine, providing smooth power delivery and excellent traction.
- The WR426F was an evolution of the WR400F, offering increased displacement and improved performance.
- These bikes were known for their robust construction, allowing them to withstand the rigors of off-road riding.
- The adjustable suspension on the WR400F and WR426F allowed riders to fine-tune the setup for different terrains and riding styles.
- The high-mounted exhaust system helped the bikes navigate rough terrain without getting damaged or clogged with debris.
- The WR400F and WR426F had a reputation for their strong low-end torque, making them ideal for technical trails and steep climbs.
- Yamaha's dedication to durability and quality was evident in the design and construction of these models.
- These bikes were popular choices for enduro and desert racing, thanks to their combination of power and reliability.
- The WR400F and WR426F were praised for their nimble handling and agility, allowing riders to maneuver through tight corners and obstacles.
- These models featured a comfortable and ergonomically designed seat, enabling riders to spend long hours off-road without discomfort.
- The WR400F and WR426F were often favored by riders who enjoyed the versatility of off-road riding, from trail exploration to motocross track fun.
Maintenance Intervals, General Maintenance Tips, and Common Issues & Solutions:
* Regular maintenance intervals include oil and filter changes every 10-15 hours of riding or as recommended by the manufacturer.
* Clean and oil the air filter regularly to ensure proper engine performance and prevent dirt from entering the engine.
* Check and adjust the valve clearances at regular intervals to maintain optimal engine performance.
* Inspect the chain tension and lubricate it regularly to prevent premature wear and ensure smooth power transmission.
* Keep an eye on the coolant level and condition, topping it up or flushing and replacing it as needed.
* Regularly inspect and adjust the suspension settings to match your riding style and the terrain you'll be riding on.
* Common issues may include hard starting, which can be resolved by checking the carburetor for clogging or adjusting the fuel mixture.
* Another common issue is excessive engine noise, which may indicate worn valve clearances and can be resolved by adjusting them to the correct specifications.
* Electrical issues can occasionally occur, so checking and securing the wiring connections is advisable.
* It is recommended to use high-quality fuel and follow the manufacturer's guidelines for octane rating to maintain optimal performance.
* Proper chain maintenance, including cleaning, lubrication, and regular tension adjustment, is crucial to prevent premature wear and ensure safe operation.
* Always refer to the official Yamaha service manual for detailed maintenance procedures and troubleshooting steps.
Popular Tuning Tips or Modifications:
Upgrading the exhaust system to an aftermarket option can improve power delivery and enhance the bike's sound.
Installing a high-performance air filter and rejetting the carburetor can optimize fueling for increased power.
Suspension upgrades, such as aftermarket fork springs and rear shock upgrades, can improve the bike's handling and comfort.
Adding a skid plate and radiator guards can provide extra protection to the engine and cooling system in off-road conditions.
Upgrading the handlebars and footpegs to aftermarket options can enhance rider comfort and control.
Available Accessories and Aftermarket Options:
Skid plates and engine guards from manufacturers like Acerbis, Polisport, and Works Connection.
Aftermarket exhaust systems from companies such as FMF, Pro Circuit, and Yoshimura.
High-performance air filters and jet kits from brands like Twin Air, Uni Filter, and JD Jetting.
Suspension upgrades from companies like Ohlins, Race Tech, and WP Suspension.
Handlebars, handguards, and grips from manufacturers like Renthal, ProTaper, and ODI.
Lighting kits and auxiliary lights for improved visibility during night riding.
Aftermarket seats and seat covers for enhanced comfort and durability.
Trail tech computer kits and GPS units for navigation and ride tracking.
Owner Reviews and Opinions:
Strengths:
Powerful and torquey engine for excellent off-road performance.
Robust construction and reliability for demanding off-road conditions.
Nimble handling and agility for maneuvering through tight trails.
Versatility to tackle various terrains, from trails to motocross tracks.
Weaknesses of the WR400F and WR426F:
Higher maintenance requirements compared to some other off-road bikes.
Heavyweight and taller seat height, making them less suitable for shorter riders.
Carburetor tuning and jetting can be challenging for inexperienced riders.
Limited fuel capacity, requiring more frequent refueling on longer rides.
Limited aftermarket support compared to more recent off-road models.
Frequently Repaired Components:
♦ Carburetor components, including jets and needle valves.
♦ Valves and valve shims, requiring periodic adjustment or replacement.
♦ Chain and sprockets, which wear out with regular use and require replacement.
♦ Wheel bearings and seals, which can wear out due to dirt and moisture ingress.
♦ Clutch components, including plates and springs, which may require replacement after extended use.
♦ Electrical components, such as spark plugs and ignition coils, which can fail over time.
♦ Fork seals and bushings, which may start leaking due to heavy off-road use.
♦ Engine gaskets and seals, which may need replacement in case of oil leaks.
♦ Brake pads and rotors, which wear out with regular use and need periodic replacement.
♦ Suspension linkage and swingarm bearings, which may require cleaning and regreasing.
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