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Including the more mature sporty model "YFZ450" Release of the new 2006 model Yamaha ATVs

June 14, 2005

On July 1, 2005, Yamaha Motor Co., Ltd. (YMC) releases on the Japanese market the 2006 model of the popular sporty-performance Yamaha ATV "YFZ450" with some spec changes for greater product maturity and boosted performance from its liquid-cooled DOHC 5-valve, 449 cc engine. On the same day the 2006 models of the other Yamaha ATVs will also be released with new coloring and graphic designs.
The 2006 Yamaha ATV lineup consists of six models ranging from the 80cc "YFM80" to the 660 cc "GRIZZLY 660" (four sports models, two utility models).

2006 model Yamaha ATV "YFZ450"


Yamaha ATV "YFZ450"

Release date:

July 1, 2005


Deep Purplish Blue Solid E (blue)

Sales plan:

30 units (annual, domestic)

Market background and product summary

With their characteristic low-pressure balloon tires, ATVs (All Terrain Vehicles) can go virtually anywhere on off-road terrain, whether its grasslands or rocky hills, sand dunes or snowfields, flats or inclines. That is why people around the world use them for a wide range of work and leisure riding. In Japan, annual demand for ATVs has stood at 500 units and use varies widely from leisure and sports to commercial and utility uses. Presently, Yamaha offers a lineup of six ATV models ranging in engine displacement from 80cc to 660cc.
The "YFZ450" borrows technologies from engine of Yamaha's hard-running production motocrosser YZ450F to create a "4-stroke lightweight sports" model capable high-performance sport-type riding. The product value of the 2006 model has been further heightened by boosting engine performance with increased displacement and new specs for the combustion chamber shape and the intake system while also adding new body parts like a titanium exhaust pipe protector for a more mature chassis spec.

Features of the YFZ450

Main new features

1) Larger displacement for boosted performance
The engine displacement has been increased to bring out a new level of performance. The bore has been kept the same as the existing model while the stroke has been lengthened from 62mm to 63.4mm, thus increasing the displacement from the existing 439cc to 449cc.

2) Optimized combustion chamber shape and new intake port shape
To optimize performance for the new larger displacement engine, the shape of the combustion chamber has been changed. Outstanding performance has also been achieved by optimizing the shape of the cylinder head for maximum efficiency in the intake valve's initial opening stage. To accommodate these changes, the intake port shape has also been changed.

3) Titanium exhaust pipe protector adopted

A lightweight titanium exhaust pipe protector has been adopted to reduce weight while also improving the exterior appearance at the same time. Other engine spec changes include new carburetor setting, new colors for exterior parts, a new radiator fin design, etc.

4) New suspension settings
Changes have been made in both the front and rear suspension settings to achieve a more comfortable ride and sportier performance.

Existing features

1) A liquid-cooled, DOHC 5-valve engine providing lively acceleration performance
This power unit is characterized by its lightweight titanium valves, FCR carburetor with TPS (Throttle Position Sensor) known for its excellence response characteristics and highly reliable plated cylinders. This is matched up with a close-ratio 5-speed transmission to provide sharp and easy to use power.

2) Suspension designed for high-performance handling
Both the front and rear suspensions feature initial load adjustment and separate compression stroke and rebound stroke damping force adjustment to let the rider set the damping characteristics to suit the terrain or personal preference. To ensure stable performance, both the front and rear shock absorbers feature piggy-back type aluminum sub-tanks. What's more, the rear suspension features the same type of link mechanism used on Yamaha's YZ motocrossers and the first lightweight, cast aluminum rear arm ever on a Yamaha ATV.

3) Lightweight design features that contribute to improved drive-ability
A lighter body has been achieved by the adoption of lightweight design features like magnesium cam and clutch covers, a high-tensile steel frame, CF die-cast aluminum rear frame and cast aluminum rear arm and aluminum wheels and hubs.

Yamaha ATV "YFZ450" Technical Specifications

Type / Engine designation YFZ450 / J317E
Overall length x width x height 1,840mm x 1,170mm x 1,090mm
Seat height 800mm
Wheelbase 1,280mm
Min. ground clearance / engine ground clearance 255mm
Dry weight 159kg
Minimum turning radius 3.5m
Engine type Liquid-cooled, 4-stroke, DOHC, 5-valve
Cylinder arrangement Single cylinder
Displacement 449cc
Bore x Stroke 95.0mm x 63.4mm
Compression ratio 11.4 : 1
Starting system Electric
Lubrication Pressurized dry sump
Engine oil capacity 1.95liters
Fuel tank capacity 10liters
Carburetion FCR39H x 1
Ignition system DC-CDI
Battery capacity / Type 12V, 6.5Ah / GT7B
Primary / Secondary reduction ratio 2. 814 / 2.714
Clutch type Wet multi-plate, coil spring
Transmission type Constant mesh 5-speed forward, left-foot action return
Gear ratios 1st: 2.418, 2nd: 1.928, 3rd: 1.562,
4th: 1.277, 5th: 1.050
Frame type Pipe frame
Caster / Trail 5° / 21mm
Toe-in / camber 2~12mm / -1.5°
King pin angle / king pin offset 15.4° / 1mm
Tire size(Front / Rear) AT21 x 7-10 / AT20 x 10-9
Brake type(Front / Rear) Hydraulic, dual disc x 2 / Hydraulic, single disc x 1
Suspension type (Front/Rear) Double wishbone independent / Swinging arm non-separate
Headlight Krypton bulb / 12V, 30/30W x 2

Yamaha ATV "YFZ450" Feature Map

The rest of the Yamaha 2006 ATV lineup




This is a utility model mounting a 660cc liquid-cooled 4-stroke engine for plenty of power in forestry or ranch work. One button enables easy switching between 4WD, 2WD and differential lock. It also features big load capacity.


Mounting a liquid-cooled 4-stroke 124cc engine on a compact, highly maneuverable chassis, this model boasts the same heavy-duty exterior as the GRIZZLY 660.




This is a sports model mounting a fast-charging air-cooled 2-stroke 195cc engine.
It features a front double wishbone and rear Monocross suspensions.


This model mounts an air-cooled 4-stroke SOHC 2-valve engine. In combination with the 6-speed transmission it boasts spirited running performance. It features a linked type rear suspension with piggy-back type gas chamber.




This is an entry-level model with a 3-speed semi-automatic transmission.


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