EVERYTHING YOU NEED TO KNOW ABOUT THE 2018 YAMAHA YZ450F

The Yamaha YZ450F
is a four-stroke sport motocross motorcycle built by Yamaha Motor Corporation.
It was the successor to the previous YZ426F, which was discontinued in 2003. Cycle World
and
Dirt Rider
magazines consider it the bike that started the four-stroke dirt bike revolution. [1][2] The 2006 YZ250F and YZ450F were the first production motorcycles to feature titanium suspension springs. [3]

The WR450F is the enduro version of the YZ450F.

Introduction [edit]

For many years, the world of motocross used almost exclusively two-stroke engines. AMA racing classes had two classes: 125cc two-stroke engines. cm and 250 cc See, excluding four-stroke engines. Most racers viewed four-stroke engine technology as largely utilitarian and uncompetitive, relegated solely to trail racing. [4]

In 1996, the AMA changed racing rules to allow 450cc four-strokes. See compete in the same racing class as the 250cc two-stroke models. [5] Yamaha engineer Yoshiharu Nakayama pioneered the idea of ​​creating the first competitive four-stroke motocross racing motorcycle. [6] The Yamaha YZ400F was designed to fit into this category. He solved the power dilemma by borrowing superbike technology and giving the YZ a five-valve head, liquid cooling and a 12.5-1 compression ratio.

In 1997, Yamaha shocked the motocross world with the introduction of the YZ400M prototype, a concept motorcycle that borrowed many of its technologies from road racing.
The YZM was far ahead of all competitors among four-stroke motocross motorcycles. Doug Henry piloted the YZ400M to his first win at the 1997 Las Vegas Supercross. This was the first time any four-stroke engine had won an AMA event. [7] The YZ400M was the predecessor to the production YZ400F, which was released the following year. First generation YZ400F

2022 Yamaha YZ450FX Enduro

The 2022 Yamaha YZ450FX enduro inherits most of the features from the previous generation (2014-2017) Yamaha YZ450F motocross bike , but with a few XC-specific features, such as long gears, larger radiator volumes, an 18-inch rear wheel, an oil seal chain, crankcase guard, side stand, offroad suspension tuning, new clutch (including new clutch material, springs, clutch release lever and oil valve). Let's see how the blue flagship behaves.

First generation: YZ400F 1998–2000[edit]

Yamaha introduced the YZ400F into production in 1998 following a successful AMA season in 1997. It was "the first modern production four-stroke motocross to compete directly with the two-stroke engine." [1] Yamaha initially aimed for a dry weight of 233 lb (106 kg) (on par with 250 two-strokes of the time), but the bike weighed 250 lb when produced. The motorcycle had power and torque of 11,600 rpm [8] [ better source needed

], close to its 250 cc two-stroke competitors. See [1] It used engine compression braking, which allowed the engine to slow the bike down during deceleration, giving the brakes a rest. [1] The 1998 YZ400F was the first bike to feature a Keihin FCR carburetor.

In 1998, Doug Henry won the AMA National Motocross Championship aboard a YZF, becoming the first rider to win the championship on a four-stroke motorcycle.
Some consider this victory a turning point in the world of motocross - the first time a four-stroke engine was recognized as a competitive racing machine. [7] Second generation YZ426F

The world's first application for the production of energy tuners

Smartphones exactly live up to their names. The YZ450F has built-in Wi-Fi functionality that can connect to your Android smartphone or iPhone (once you've downloaded the app - which is free with the purchase of the bike). It allows you to adjust the ignition and fuel supply, as well as many other functions.

The 2018 YZ450F is the world's first production motocross motorcycle with wireless smartphone-based engine tuner. All-new Yamaha Power Tuner for iOS and Android The app and communication control unit connect the rider to the bike like never before. The new Yamaha Power Tuner app can make changes to fuel and ignition mapping - downloaded wirelessly to the bike via the built-in Wi-Fi system - for ultimate tuning on the trail.

The Wi-Fi block is hidden behind the left side panel.

The Journal feature allows you to take notes on your riding location, conditions, bike settings and more, giving you a baseline for future rides. The app can also monitor a range of information such as RPM, throttle position, engine coolant temperature and more. There is also a maintenance feature with customizable mileage counters that allows you to track the completion time of your selected items.

The new Yamaha Power Tuner app, released with the 2018 YZ450F, allows engine detailing to be tweaked in even more detail than before. It also allows users to share settings among their team or with friends (along with other information), turning the system into a tool that helps facilitate communication.

Second generation: YZ426F 2001–2002[edit]

In 2000, Yamaha updated the YZ400F, increasing engine displacement to 426 cc. See for more power and throttle response. Additionally, the carburetor and jets have been updated to alleviate the YZ400F's starting problems.

The following year, 2001, Yamaha replaced the old steel valves with titanium ones. The new valves were over forty percent lighter than the previous valves, allowing for lighter, softer valve springs, which in turn allowed for higher engine speeds, improved throttle response, higher rev ceilings, and more power. [4] The crankshaft was also redesigned and the entire design was redesigned for quicker throttle response and, according to Yamaha, "less loss of horsepower." In addition to engine modifications, several changes were made to the transmission to help maintain power and ensure durability. The suspension has also been slightly reworked to reduce weight and provide a smoother ride throughout. [9]Yamaha also developed a new exhaust pipe design so that replacing the oil filter no longer requires removal of the exhaust manifold. The carburetor setting was changed to cope with the difficulty of starting and taking off at idle.

Also in 2001, the steel subframe was replaced with aluminum, painted blue. In 2002, the blue paint job was discontinued and remained pure aluminum. [10] Motorcycle.com says, “The gas tank is thin enough to allow for good fore and aft movement while providing something nicely shaped to hold onto your knees. In fact, the entire ergonomic body of this YZF is well thought out. The handlebars have a good bend and are well positioned for good rider control and leg room. The footpegs are well made units with a wide platform and sit in a position that keeps them from dragging over ruts without putting pressure on the rider's legs.”

For 2002, Yamaha updated the CD Digital Ignition system, which provides a more precise spark and optimal timing for faster, stronger response under hard acceleration and less kickback during startup.
There's also an all-new swing arm that's lighter and stronger, resulting in reduced weight, increased rigidity and more flexible rear suspension performance. The anodized finish gives the bike a unique look. The 426 also features a larger swing mechanism for increased strength. A larger rear brake disc has also been added, meaning more stopping power. [11] Third generation YZ450F

Third generation YZ450F 2003–2005[edit]

In 2003, the YZF received the biggest update in its history. First, the engine displacement was increased to 449cc to comply with the new AMA Motocross maximum displacement rule, the engine now producing over 52 hp. (39 kW). The frame and plastic were then updated to give a new, sleeker look. Additionally, the YZF's weight has been reduced from the original 250 lb (110 kg) to 233 lb (106 kg). The bike had enormous power; however, many thought the bike had too much power for a motocross track. [12] The 2005 YZ450F was the first YZ450F to feature a KYB dual-chamber cartridge fork.

Fourth generation YZ450F 2006–2009[edit]

Fourth generation YZ450F

The YZ450F received a major update for 2006, with more than 300 parts changed and improved. The power was smoothed out and the bike was easier to ride, ending the complaint that the YZ had too much power. [13] The transmission was reverted to a more traditional five-speed. An all-new single-frame aluminum frame reduces weight by another 10 pounds.

In 2006, KYB SSS forks appeared.

In 2007, changes were made to the camshaft and exhaust system, shifting power from low to mid-rpm. 2008-2009 We moved the power range up to mid-range.

YZ450FX enduro motorcycle chassis

The YZ450FX's enduro chassis feels larger than previous models, largely because it has a wider radiator guard. The curb weight is 118.8 kilograms, and this weight is much easier to manage while riding than when it needs to be lifted onto a stand for some reason.

Instant throttle response makes the Yamaha YZ450FX feel lighter during the ride, especially when pushing the throttle to get over an obstacle, which the bike does with ease thanks to the stable, tightly built chassis. The feeling of a strong and reliable bike makes fast sections less intimidating, as well as turns. The motorcycle turns easily with a jerk of the gas in a controlled drift.

Fifth generation YZ450F 2010-2013 [edit]

Fifth generation YZ450F

On September 8, 2009, Yamaha introduced the all-new fuel-injected YZ450F. The engine cylinder is angled rearwards, the crankshaft angle has been changed to allow for more complete combustion, the 5-valve head is now a 4-valve head, the gas tank is located under the seat, and the exhaust pipe exits from the rear. cylinder, and the air intake is now located at the front of the bike. They have a new double-sided frame that allows for improved steering and new engine components. It all comes together to create a mass centralized bike. The bike was introduced by Yamaha Factory Motocross racer James Stewart. Top speed was recorded at 80 mph.

Driving performance

Despite the declared cross-country characteristics, the maximum speed for the bike is only 150 km/h.

In the standard version, Dunlop tires with square studs arranged in a checkerboard pattern provide traction.

But at the same time, thanks to proprietary wheels, correct spokes and tubeless tires, it feels confident both on asphalt and on the ground, and the large shock absorber range ( ~ 300 mm ) allows you to easily overcome all sorts of bumps and holes on the way.

Fuel consumption and tank volume

The volume of the motorcycle's gas tank has increased from 6 liters (in the first years of production) to 7.5 (modern models). This reserve is enough for a distance of 200–350 km .

The average consumption in a mixed cycle is 3 liters.

Links[edit]

1. ^ abcd Lewis, Jimmy (January 2002), "Main Event: Honda CRF450R Lines Up Against KTM 520 SX and Yamaha YZ426F", Cycle World
   ,
   41
   (1), pp. 70ff (8)
2. ↑
   Hoffman, Scott (February 2002), "The Coming Future of the 2003 YZ450F Concept",
   Dirt Rider
   , Primedia Enterprises, pp. 28ff (3). Less than a year ago, hints of an "all-new Yamaha YZ450F" were doing the rounds. world of motocross. The rumors were much less shocking compared to when Yamaha first unveiled its factory YZ400M in 1997 and its plans to create a competitive four-stroke motocross, although it still had merit. This was also due to Honda's latest news regarding its CRF45OR four-stroke motocross bike project. However, Yamaha cemented its name five years ago and its revolutionary machine will forever be remembered as the catalyst that lit a fire in the smoldering world of four-stroke motocross.
3. "Titanium spring improves motocross bikes", Advanced Materials & Processes
   ,
   164
   (7), p. July 9, 2006, archived from the original on October 26, 2012. For the 2006 model year, the Yamaha YZ125 and YZ250 two-stroke and YZ250F and YZ450F four-stroke motocross motorcycles feature titanium shock-absorbing springs, a production first. motorcycles from every manufacturer were equipped with titanium suspension springs as original equipment, reports Timet Automotive, Morgantown, Pennsylvania. Yamaha says the new springs have "outstanding strength and fatigue resistance" and reduce unsprung weight for improved suspension performance.
4. ^ ab "2001 Yamaha YZ426F: MD Ride Review". motorcycledaily.com
   .
5. "Page not found!" (PDF). www.amaproracing.com
   . Cite uses a generic header (help)
6. “YZ426F: Miracle Machine? — Motocross news, race reports, videos, photos, interviews, How-Tos." transworldmotocross.com
   .
7. ^ ab Motorcycle Hall of Fame: Doug Henry, Archived January 13, 2010 at the Wayback Machine
8. GT Thunder test bench
9. "Year 2001 Yamaha YZ426F". Motorcycle.com. 2000-10-27. Retrieved December 27, 2011.
10. "Year 2001 Yamaha YZ426F". Motorcycle.com
    .
11. "New Yamaha Dirt Bikes for 2002: Off-Road.com". Dirtbike.off-road.com. 2005-11-01. Retrieved December 27, 2011.
12. "First Impression: 2004 Yamaha YZ450F - Motocross News, Race Reports, Videos, Photos, Interviews, How-Tos". transworldmotocross.com
    .
13. "2006 Yamaha YZ450F - First Ride - MotorcycleUSA.com". motorcycle-usa.com
    .

Air filter

The airbox design of the 2019-20 Yamaha YZ450F is simply terrible. Yamaha uses a flat piece of foam that rests on the base like a piece of bread on a plate. And every time the motor is shaken by the flash (and this happens up to 10,000 times per minute), the filter is shaken on the wire from which the base is made. Constant vibration shakes the oil out of the foam rubber, and the engine sucks it in until it begins to suck dust and dirt through the dry foam rubber. This can be solved in two ways.

Firstly, you can use the YZ450F Twin Air Filter on the Yamaha YZ450F. It is much thicker, plus it has a spacer that separates the foam from the mount and reduces the vibration load on the filter and prevents it from fluttering under the influence of passing air.

Secondly, Twin Air offers an even better solution in the form of the Power Flow kit. This includes a new airbox O-ring that replaces the wire base, a new aluminum mesh (inside the filter rather than on top), and a domed filter that replaces the flat piece of foam. If you still decide to leave the stock filter, check it constantly, and if you see a lightened area in its center, be sure to lubricate it with impregnation for foam filters.

But specifically, we actually installed the airbox expander from the 2022 Power Flow Kit - remember that scary one, with rivets, attached to the plastic hump? It doubles the volume of the airbox and allows you to remove a couple of extra horses.