Back to 2010 Yamaha ATV Quad Models Index Page

Click photos to enlarge.
They make great desktop images.

2010 Yamaha YZF450X
2010 Yamaha YZF450X

2010 Yamaha YZF450X
2010 Yamaha YZF450X

2010 Yamaha YZF450X
2010 Yamaha YZF450X

2010 Yamaha YZF450X
2010 Yamaha YZF450X

– 2010 Yamaha YZF450X

2010 Yamaha YZF450X

The all-new YFZ450X is a woods specialist with a narrower width for blasting around trees, logs and more.

In 2009 the 2009 Yamaha YFZ450R raised the bar yet again with a new wide-track chassis designed to dominate the motocross track.

For 2010 Yamaha introduces the 2010 Yamaha YFZ450X with all of the new features found on the wide-track “R” version including the powerful fuel injected 5-valve engine, hybrid frame, long travel suspension, and powerful brakes… Only the 2010 Yamaha YFZ450X model is 3″ narrower for trail and technical woods riding.

This new “X” version of the fuel injected YFZ450 has a narrow track chassis for tight woods and trail performance.

Where the YFZ450 R has an extra wide track for motocross racing, it wasn’t really designed for woods riding, and in some cases might be too wide for a particularly tight trail. So if you wanted all of the great new features on the latest YFZ for hare scrambles or cross country racing, you would have had to modify the “”R”” version… until now.

The YFZ450 X has all of the same great features as it’s “R” sibling, including the powerful 5-valve 449cc race engine that had been updated in 2009 with fuel injection and a bunch of goodies from our YZ motocross bikes. This high performance engine is cradled by the same hybrid aluminum chassis as the 450 R for improved strength and reduced flex, making the new YFZ450 X the most capable woods racer we’ve ever developed.

The YFZ450 X also has the same top shelf long-travel suspension components as the 450 R, with triple adjustable shocks, gull-wing style front a-arms and a super strong gravity fed aluminum rear axle. The 450 X also shares the latest 65mm wide footpegs, controls and cushioned body panels, not to mention the most powerful brakes around.

So what makes the 450 X different? Well for one it is 3 inches narrower than the 450 R, so it’s going to be a lot easier to navigate through the tight trails. And the suspension settings have been modified to better match woods style riding. The X model also gets new rims that are even lighter than those on the 450 R, and with less overall mass the 450 X will out accelerate and out brake the wider 450 R.

Other than that, they are pretty much the same. Both designed to dominate the competition… one on the motocross track, the other in the woods.

“With GNCC racing making serious headway in both manufacturers’ and buyers’ minds, the 450X is a surefire hit for Yamaha and will no doubt join the long list of best selling Yamaha Sport 4-wheelers.” – All Terrain Vehicle magazine



All New for 2010
” For the ATV riders who need a machine that can dominate the tight GNCC® race courses…look no more, the YFZ450X is here! Boasting many similarities with the YFZ450R, the X version is more compact for tight trails, race course, and woods riding.
” Fatigue can sometimes be a racer’s worst competition. That’s why the YFZ450X’s designers made this ATV so comfortable. It boasts racer-friendly ergonomics with plenty of room to hang off in the corners, and the seat is padded just right to be more comfortable regardless of riding position. Handlebars are 4-position adjustable, too, so every rider can choose the best position, and the throttle has been designed for all day comfort.
” This 449cc engine uses a titanium five-valve cylinder head technology, with a camshaft designed just for this machine to deliver abundant low to midrange torque for performance where you can really use it to take the lead – while still maintaining a super strong top end to let you pull away from the pack.
” The YFZ450X incorporates Yamaha Fuel Injection for precise fuel delivery. With big 42mm Mikuni® throttle body and 12-hole injector, this system provides exceptional atomization of the fuel for maximum power. The system also includes ISC (Idle Speed Control) for easy, reliable start-up and warming.
” This ATV is designed to make race prep easy. Body panels come off easily for service; there’s no need to remove the battery or other components to get the fenders off. The aluminum frame is bolted together, rather than welded, for maximum durability. And the oil tank is integrated with the crankcase so it’s easier to service the engine.


” The fuel-injected 449cc engine has superb power characteristics. Power delivery is smooth and strong off the line with lots of low and midrange where you need it.
” The crankcase holds a crankshaft that’s ready to handle the increased balance ratio, as well as a counterbalancer for superior vibration control. The crankcase also houses the oil tank, which helps to centralize mass for unmatched handling and makes maintenance easier.
” Camshafts are designed to maximize the torque available in the low and mid ranges.
” Fuel injection uses a 12-hole injector that provides exceptional atomization of the fuel for maximum combustion efficiency and power delivery. The system also uses a big, 42mm Mikuni® throttle body and includes ISC (Idle Speed Control) for easy, reliable start-up and warming.


” The chassis is very spacious, allowing room for even an aggressive racer to move around, and the ATV’s body panels that the rider contacts during operation are of a special, softer plastic material for greater comfort. The seat is narrow in the front, yet wide and padded in the rear to provide a more comfortable ride, even when hanging off on the side of the seat in a turn.
” ProTaper® handlebars are mounted on 4-way clamps for exceptional adjustability. There are two sets of holes in the handlebar crown, and eccentric clamps so the rider can choose the standard setting, 10mm or 20mm forward, or 10mm back.
” The wheel has been redesigned, with the inner lip rolled in. This increases the rigidity, allowing a reduction in weight while maintaining strength.
” Foot pegs are a generous 2.6 inches wide, something riders will appreciate every time they want to get up on the pegs, with good kick-up on the ends for solid footing.
” The frame is aluminum for lightweight, except for the frame member under the engine. Here tensioned steel is used for its combination of strength and thinness. This allowed the designers to sit the engine lower overall for excellent mass centralization for unmatched handling. The frame is bolted together, rather than welded, for maximum durability.
” The front frame is noticeably narrow at the A-arm mounting points. This dramatically reduces changes in camber as the long A-arms travel through their full range of motion. The front 44mm KYB® shocks have Kashima coating for smooth operation with superb bump absorption and excellent anti-bottoming characteristics. The 9.4 inches of wheel travel means this racer is up to even the most challenging tracks.
” The rear swingarm is crafted of strong, gravity-fed aluminum, and it’s matched to a fully adjustable 46mm KYB® piggyback shock absorber for excellent handling. Rear wheel travel is 11.0 inches for comfort even on tough terrain.
” For excellent stopping ability, YFZ450X features dual front hydraulic disc brakes and a trick looking, lightweight wave-type rear rotor.


Additional Features:
” The throttle lever requires low effort, and it’s very comfortable to use. That means less fatigue during all-day riding.
” The instrumentation is all business. The discrete panel on the fender in front of the rider gives vital indicators about low fuel, coolant temperature, check engine, and neutral gear via a straightforward LED display.




2010 Yamaha YZF450X – USA Specifications
MSRP* $8,499 (Team Yamaha Blue) Available from September 2009
$8,499 (White/Red ) Available from September 2009

Type 449cc, 4-Stroke Single, Liquid Cooled w/ Fan, Titanium 5-Valve DOHC

Bore x Stroke 95mm x 63.4mm

Compression Ratio 11.6:1

Fuel Delivery Yamaha Fuel Injection (YFI), 42mm

Ignition Digital TCI: Transistor Controlled Ignition

Starting System Electric

Transmission 5-Speed Manual Clutch

Drive Train 2WD; Sealed O-Ring Chain, Eccentric Adjustment

Suspension/Front Independent double wishbone, w/Kashima coated piggyback shocks, High/Low speed compression, rebound and threaded preload adjustment, 9.4-in travel

Suspension/Rear Cast aluminum swingarm w/piggyback High/Low speed compression, rebound and threaded preload adjustment, 11.0-in travel

Brakes/Front Dual Ventilated Hydraulic Disc, Twin Piston

Brakes/Rear Wave Style Ventilated Hydraulic Disc, Twin Piston

Tires/Front AT21x7-10 Radial

Tires/Rear AT20x10-9 Radial

L x W x H 70.7 x 46.1 x 41.9 in

Seat Height 31.9 in

Wheelbase 50.0 in

Ground Clearance 4.5 in

Fuel Capacity 2.6 gal

Wet Weight 400 lb

Lighting Dual 30W Krypton multireflector Headlights and 3.9/0.5W LED Brake light

Warranty 6 Month (Limited Factory Warranty)



2010 Yamaha YZF450X – Canada Specifications
Canadian MSRP* $11,449 CDN

Engine 4-Stroke Single, Liquid Cooled w/ Fan, Titanium 5-Valve DOHC
Displacement 449cc
Bore and Stroke 95mm x 63.4mm
Compression Ratio 11.6:1
Carburetion Yamaha Fuel Injection (YFI) , 42mm
Ignition TCI (Digital)
Starting Electric
Transmission 5-Speed, Manual Clutch
Final Drive 2WD; Sealed O-Ring Chain, Eccentric Adjustment

Suspension (Front) Independent Wide-Arc Double Wishbone, w/ 9.4″ of travel. Kashima coated Piggy Back shocks featuring High/Low Speed Compression, Rebound and Threaded Preload Adjustment
Suspension (Rear) Cast Aluminum Swing Arm, w/ 11.0″ of travel. Piggy Back shock featuring High/Low Speed Compression, Rebound and Threaded Preload Adjustment.
Brakes (Front) Dual Ventilated Hydraulic Disc , Twin Piston Calipers
Brakes (Rear) Wave Style Ventilated Hydraulic Disc, Twin Piston Caliper
Tires (Front) AT21x7-10 Dunlop KT351 Radial
Tires (Rear) AT20x10-9 Dunlop KT356 Radial

Length 1,795mm (70.7″)
Width 1,170mm (46″)
Height 1,065mm (41.9″)
Wheelbase 1,270mm (50.0″)
Ground Clearance 235mm (9.25″)
Seat Height 810mm (31.9″)
Wet Weight 181kg (400 lb) – ready to ride full of fuel and oil
Fuel Capacity 10.0 L
Colour(s) Racing Blue


Specifications, appearance, and price of product are subject to change without notice.

* MSRP does not include freight, PDI (Pre Delivery Inspection), pre-rigging (boats), or taxes. Dealer may sell for less.


ATV Safety Notes

– ATVs with engines 70 to 90cc are recommended for use only by riders 12 years and older and always with adult super vision. ATVs with engines 90cc or greater are recommended for use only by riders ages 16 years and older.

– Yamaha recommends that all ATV riders take an approved training course. For safety and training information, see your dealer or call the ATV Safety Institute at 1-800-887-2887.

– ATVs can be hazardous to operate. For your safety, always avoid paved surfaces. Never ride on public roads. Always wear a helmet, eye protection and protective clothing.

Never carry passengers. Never engage in stunt riding. Riding and alcohol/drugs don’t mix. Avoid excessive speed. And be particularly careful on difficult terrain. There are few joys in life equal to the free-spirited thrill and experience of ATV riding. And that’s why it’s important for all of us to do
our part as responsible riders. By following logical, common-sense rules, we can maintain season after season of unparalleled enjoyment of our sport.

– Please remember to “tread lightly.” Always ride in a responsible manner, respecting the environment as well as all state and local laws. The riders in this brochure are professionals; don’t attempt to emulate them. Prices and specifications subject to change without notice. Please read your Owner’s Manual and all labels before operation. All ATVs come with a six-month Limited Factory Warranty. See your dealer for details.