Yamaha YZ450FJ YZ450F 2018 Owner's Manual

Yamaha YZ450FJ YZ450F 2018 manual cover
Pages 374
Year 2018
Language(s)
English en

Yamaha YZ450FJ YZ450F 2018 Specification

The Yamaha YZ450FJ YZ450F 2018 is a high-performance motocross motorcycle engineered for competitive racing and off-road adventures. At its core, the YZ450FJ is powered by a 449cc liquid-cooled, DOHC four-stroke engine featuring a compact cylinder design and rearward-slanted configuration, optimizing mass centralization and performance. The engine is equipped with a high-compression piston and a new intake port shape, delivering enhanced power output and improved throttle response. The fuel injection system is precision-tuned for consistent power delivery across varying conditions.

The 2018 model introduces a revised bilateral beam aluminum frame, offering enhanced rigidity and balance for improved handling and cornering stability. The bike's suspension system comprises KYB® speed-sensitive forks with optimized settings, providing superior shock absorption and damping characteristics. The rear suspension features a KYB® monoshock with a revised linkage system, ensuring smoother and more controlled rear wheel movement.

A significant upgrade in the 2018 YZ450FJ is the integration of the Yamaha Power Tuner smartphone app, allowing riders to adjust fuel and ignition mappings wirelessly for a tailored riding experience. The ergonomic design includes a flatter seat, thinner fuel tank, and narrower shrouds, facilitating better movement and control for the rider. The electric start system, powered by a compact lithium-ion battery, ensures quick and reliable engine ignition.

The braking system comprises robust front and rear disc brakes, providing exceptional stopping power and control. The bike's lightweight wheel assembly and high-traction tires are designed for optimum performance on varied terrains. Overall, the Yamaha YZ450FJ YZ450F 2018 combines advanced engineering, innovative technology, and rider-centric design, making it a formidable choice for motocross enthusiasts and professional racers.

Yamaha YZ450FJ YZ450F 2018 F.A.Q.

How do I properly break in the engine of my 2018 Yamaha YZ450FJ YZ450F?

To break in the engine, start with short periods of moderate riding. Avoid full throttle and vary the engine speed. After the first hour, change the oil and oil filter to remove any metal particles. Gradually increase the engine load over the next few hours of riding.

What type of oil is recommended for the Yamaha YZ450FJ YZ450F 2018?

The recommended oil is Yamalube 4-R 10W-50 or a high-quality 4-stroke motorcycle oil with an API service classification of SG or higher. Always check the owner's manual for the manufacturer's latest recommendations.

How often should I service the air filter on my YZ450F 2018?

The air filter should be checked and cleaned after every ride in dusty conditions. In less severe conditions, inspect it at least every 2-3 rides. Replace the air filter if it's damaged or excessively dirty.

What is the correct tire pressure for the Yamaha YZ450FJ YZ450F 2018?

The recommended tire pressure is typically around 12 psi for the front and rear tires. However, this can vary based on riding conditions and personal preference. Always check the tire pressure before each ride.

How can I adjust the suspension on my YZ450F to suit my riding style?

Adjust the suspension by tuning the compression and rebound damping settings. Start with the factory settings, then make small adjustments to suit your riding style and track conditions. Refer to the owner's manual for specific guidance on making these adjustments.

What should I do if my 2018 YZ450F won't start?

First, check the fuel level and ensure the fuel valve is on. Verify that the kill switch is in the 'run' position. Inspect the spark plug for fouling or damage and replace it if necessary. If the bike still won't start, it may require professional diagnosis.

How do I change the coolant in my Yamaha YZ450FJ YZ450F 2018?

To change the coolant, first, ensure the engine is cool. Remove the radiator cap and drain bolt to let the old coolant out. Flush the system with distilled water, then refill with a 50/50 mix of coolant and distilled water. Bleed any air from the system by running the engine with the radiator cap off until warm.

What are the common signs of clutch wear on the YZ450F 2018?

Signs of clutch wear include slipping under load, difficulty in shifting gears, or a spongy clutch lever feel. If you notice these symptoms, inspect the clutch plates and springs, and replace them if worn.

How do I adjust the chain tension on my YZ450FJ YZ450F 2018?

To adjust the chain tension, place the bike on a stand, loosen the axle nut, and turn the chain adjuster bolts evenly until the chain has 1-1.5 inches of slack at the midpoint. Tighten the axle nut to secure the adjustment.

What maintenance should be performed after riding in wet or muddy conditions?

After riding in wet or muddy conditions, thoroughly clean the bike to remove dirt and moisture. Check and lubricate the chain, inspect the air filter for dirt, and ensure all electrical components are dry and functioning properly.