Yamaha YZ450

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Yamaha YZ450
Manufacturer
Also called YZ450FSE - Special Edition, YZ450F Team Replica, YZ450F 60th Anniversary, YZ450FX, YZ450F, YZ 450 F
Production 2003 - 2019
Class Motocross
Engine
449.7 single cylinder, four-stroke
Bore / Stroke 97.0mm x 60.9mm
Compression ratio 12.8:1
Horsepower 59.94 HP (44.7 KW) @ 9000RPM
Torque 39.09 ft/lbs (53.0 Nm) @ 7500RPM
Ignition tci
Transmission Gear box: 5-speed

Final Drive: chain

Clutch: wet multi-disc
Suspension Front: kyb® spring-type fork with speed sensitive damping; fully adjustable
Rear: kyb® single shock; full adjustable
Brakes Front: single disc. hydraulic
Rear: single disc. hydraulic
Front Tire 80/100-21
Rear Tire 120/80-18
Wheelbase 58.31 inches (1481 mm)
Length 85.59 inches (2174 mm)
Width 32.52 inches (826 mm)
Height 50.79 inches (1290 mm)
Seat Height 37.99 inches (965 mm)
Weight 218.92 pounds (99.3 Kg) (dry), 116.1 kg (wet)
Oil Capacity 0.32 Gallon (1.20 Liters)
Oil Filter K&N KN-142
Recommended Oil Yamalube 10w-40
Fuel Capacity 2.2 Gallon (8.33 Liters)
Manuals Service Manual


The Yamaha YZ450FX was a single cylinder, four-stroke Trial motorcycle produced by Yamaha between 2003 and 2019. Max torque was 39.09 ft/lbs (53.0 Nm) @ 7500 RPM. Claimed horsepower was 59.94 HP (44.7 KW) @ 9000 RPM.

Engine[edit]

The engine was a liquid cooled single cylinder, four-stroke. A 97.0mm bore x 60.9mm stroke result in a displacement of just 449.7 cubic centimeters. Fuel was supplied via a double overhead cams/twin cam (dohc).

Drive[edit]

The bike has a 5-speed transmission. Power was moderated via the wet multi-disc.

Chassis[edit]

It came with a 80/100-21 front tire and a 120/80-18 rear tire. Stopping was achieved via single disc. hydraulic in the front and a single disc. hydraulic in the rear. The front suspension was a kyb® spring-type fork with speed sensitive damping; fully adjustable while the rear was equipped with a kyb® single shock; full adjustable. The YZ450FX was fitted with a 2.2 Gallon (8.33 Liters) fuel tank. The bike weighed just 218.92 pounds (99.3 Kg). The wheelbase was 58.31 inches (1481 mm) long.

2003 Yamaha YZ 450 F[edit]

YZ 450 has finally reached maturity with the 2003 model and Yamaha has created a confidence-inspiring bike that enables the rider to reach the limits of their ability without any drama or stress.


2003 Yamaha YZ450F[edit]

2003 Yamaha YZ450F

The 2002 YZ450F is the top-drawer dirt bike in Yamaha's line-up , and it comes with a new 449cc engine, with liquid cooling and a 5-titanium-valve architecture, and redesigned automatic decompression for easier starts. The clutch is also new, and sports bigger plates for a more resilient performance under stress, while the all-new 4-speed transmission was revised for more explosive power deployment, one thing skilled riders really appreciate.

A new suspension was installed, alongside stronger brakes and lighter frame and swingarm, all for razor-sharp handling regardless of how difficult the terrain might be.


2004 Yamaha YZ450F[edit]

2004 Yamaha YZ450F

The 2003 YZ450F gets 48mm upside down forks with revised setting for a smooth, progressive feel and exceptional ground contact in the most demanding of scenarios. An all-titanium valve head allowing continued operation near the red line, a counterbalancer, revisions for other internals and more are making the engine of the 2003 YZ450F a high-performing lump for thrill-seekers.

Add in a heavy-duty clutch, a strong and stiff steel frame, sturdy wheels and a better auto-decompression system to up the ante even more and prove that this beast is really able to bring in trophy after trophy.


2006 Yamaha YZ450F[edit]

2006 Yamaha YZ450F

The YZ450F is the flagship off-road bike in Yamaha's 2005 line-up and it comes as an all-new machine, with a new engine, new frame and obviously, a new transmission. The YZ450F was improved in all sectors, from the high-performance, hi-revving titanium valves to the new intake, modified inclination angle for the cylinder, a more centralized mass and easier servicing.

Multiple works' style features have also been implemented, and the 2005 YZ450F is ready to take on the roughest tracks and help you start gathering trophies. Suspensions have not been overlooked, with revalving adding more precision to the ground tracking job and offering better directional control.


2007 Yamaha YZ450F[edit]

2007 Yamaha YZ450F 2007 Yamaha YZ450F 2007 Yamaha YZ450F 2007 Yamaha YZ450F

The 2007 MY of the YZ450F carries on the new performance standards introduced by the previous year model. What started out as a new engine in a new chassis has been revised and tweaked for even better grunt and more precise power management. The 2007 MY got a new exhaust cam, revised fuel delivery and a new exhaust system.

Several brake and suspension elements have been redesigned for weight loss, while the rear monoshock was optimized for better response to demanding situations. The clutch now has a stronger pressure plate, while fewer steel plates reduce heat build-up and provide a lighter lever pull.


2008 Yamaha YZ450F[edit]

2008 Yamaha YZ450F 2008 Yamaha YZ450F 2008 Yamaha YZ450F 2008 Yamaha YZ450F 2008 Yamaha YZ450F

A lot of structural upgrades have been implemented in the 2008 MY YZ450F, starting from the steering head and extending to minute details, such as the wider foot pegs, fork protectors, upper and lower triple clamps. The width of the rear tire was also changed for improved traction.

Multiple engine tweaks ensure better performance: a revised intake, elimination of power loss caused by the pumping effect, carburetor revisions and a new titanium header. Cue a new aluminum handlebar and new mounts for it, better brakes and rotors, and more,a ll with one single goal: making you accelerate faster, turn better, claim more wins.


2009 Yamaha YZ450F[edit]

2009 Yamaha YZ450F 2009 Yamaha YZ450F 2009 Yamaha YZ450F 2009 Yamaha YZ450F 2009 Yamaha YZ450F

The YZ450F is the top-of-the-line competition bike, packing almost scary amounts of torque and top-end power to put a big grin on the faces of experienced riders. Often referred to as the ultimate step in motocross machines, the 2009 model year brings new camshafts, a shorty, lighter muffler and a new intake design for better performance across the whole rev range.

This model year also used a revised frame and a new 48mm fork. As for the rest, the YZ450F stands as one of the best packages in the business, with a beastly 449cc 5-valve, 4-stroke liquid-cooled mill generating all the dirt fun.


2010 Yamaha YZ450F[edit]

2010 Yamaha YZ450F 2010 Yamaha YZ450F 2010 Yamaha YZ450F 2010 Yamaha YZ450F

The 2010 MY YZ450F arrives with a lot of improvement,s which start with the rear-slanted cylinder and repositioned intake and exhaust ports, better-distributed, more centralized mass and premium fuel injection system. Yamaha adds a new swingarm, longer suspension travel, a completely new bilateral beam frame and new fuel tank.

Other news about the 2010 MY YZ450F include a new rear sprocket shape, new triple clamps, fenders, skidplate and an optional YZ Power Tuner system for on-site adjustments to the engine mappings.


2011 Yamaha YZ450F[edit]

2011 Yamaha YZ450F

The 2011 MY YZ450F is Yamaha's top off-road performer, a bike incorporating a lot of works-developed technologies and components. Built with the racing program experience, the YZ450F is a bike for true racers. It sports explosive power and incredible maneuverability, plus ergonomics specially formulated for competition use. The weight optimization brings everything closer to the center of the bike, into the newly-revised bilateral beam aluminum frame. The suspension is also all-new for this model year.


2012 Yamaha YZ450F[edit]

2012 Yamaha YZ450F 2012 Yamaha YZ450F 2012 Yamaha YZ450F 2012 Yamaha YZ450F 2012 Yamaha YZ450F

The 2012 MY Yamaha YZ450F sports a revised fuel injection settings (mapping for injection and advance) and offers smooth, controllable engine response in the low-to-mid-rpm range.

Boasting a centralized mass construction, the YZ450F is incredibly easy to handle and cornering is made easy in any situation. 2013 brings new forks and a damping control rear shock, while the optional GYTR Power Tuner lets the discerning user adjust the fuel/air mixture and ignition, for the optimal performance according to riding style and need.

The fuel tank is positioned under the seat for a lower center of gravity and better steering. The YZ450F is the perfect tool for those looking for a powerful yet highly manageable off-road/ dirt bike.


2013 Yamaha YZ450F[edit]

2013 Yamaha YZ450F 2013 Yamaha YZ450F 2013 Yamaha YZ450F 2013 Yamaha YZ450F 2013 Yamaha YZ450F

The 2013 MY Yamaha YZ450F boasts extreme capabilities for the motocross skilled racer and it's revolutionary engine set new trends in the world of 4-stroke off-road bikes.

Boasting a centralized mass construction, the YZ450F is incredibly easy to handle and cornering is made easy in any situation. 2013 brings new forks and a damping control rear shock, while the optional GYTR Power Tuner lets the discerning user adjust the fuel/air mixture and ignition, for the optimal performance according to riding style and need.

The fuel tank is positioned under the seat for a lower center of gravity and better steering. The YZ450F is the perfect tool for those looking for a powerful yet highly manageable off-road/ dirt bike.


2014 Yamaha YZ450F[edit]

2014 Yamaha YZ450F 2014 Yamaha YZ450F 2014 Yamaha YZ450F 2014 Yamaha YZ450F 2014 Yamaha YZ450F

The 2013 YZ450F is an all-new bike, featuring a new EFI engine, an entirely new frame, updated suspensions and many other upgrades which make it a great off-road bike for both competition and outdoor recreational use. Even the bodywork was redesigned, for a more minimalist attire, enhancing both mass centralization and the overall feel of the bike.

According to those who tested it, the 2103 Yamaha YZ450F feels and handles like a 250cc-class machine, but with all the power and the dirt aggression of a class-leading 450 machine. With the new aluminum frame, a lot had chanced for better rider comfort and even the exhaust system was redesigned for better weight distribution and higher performance.


2016 Yamaha YZ450FX[edit]

2016 Yamaha YZ450FX 2016 Yamaha YZ450FX 2016 Yamaha YZ450FX 2016 Yamaha YZ450FX 2016 Yamaha YZ450FX

The 2016 YZ450FX shares the YZ450F’s revolutionary rearward-slanted-cylinder design, with a reversed cylinder head and forward-positioned straight intake. The YZ450FX delivers a controllable, torquey power character with strong top-end power tuned specifically for cross-country racing. The obvious changes to an off-road bike are the 18” rear wheel, a skid plate (which was oddly missing from the YZ250FX), an O‐Ring Chain, an aluminum Side stand and suspension tuned for the job. A big difference from YZ motocross bike is the return of the 22mm off-set triple clamp and the use of a slightly longer shock length to raise up the rear of the bike.


2018 Yamaha YZ450F[edit]

2018 Yamaha YZ450F 2018 Yamaha YZ450F 2018 Yamaha YZ450F 2018 Yamaha YZ450F 2018 Yamaha YZ450F

Yamaha continues to use spring-type forks with refined, speed-sensitive damping to give industry-leading suspension performance straight out of the box. 2018 brings updated settings to match the updated frame and engine layout.


In Media[edit]