To the New ATV World Order
If you've heard it, you can't forget the awesome
sound of the liquid-cooled DOHC five titanium-valved
single in the baddest motocrosser ever built - the
We had no choice but to adapt that engine for use
in the most serious ATV the planet's ever come up
against. We call it the YFZ450, and nobody else
builds anything like it.
Not only is the hybrid 439cc DOHC titanium-valved
five-speed engine far superior to anything that's
come before, at 350 pounds, the YFZ450 is endowed
with the highest power-to-weight ratio of any four-stroke
ATV ever built.
it even has electric start, and when you open the
39mm Keihin carburetor all the way and take aim,
you'll also appreciate the lowest center of gravity
in the class and the latest industry-leading suspension
But we’re just getting warmed up here, so why don’t
you visit the Features & Benefits page to get a
closer look at the YFZ450's list of incredible features.
You'll see, it all adds up to the lightest, most
powerful, best-handling ATV ever produced. It's
simple. You'll either be riding a YFZ450 this season
or trying to catch up to one.
Manufacturer's Sugg. Retail Price...$6,899*
2004 YFZ 450 Features & Benefits
439cc, 5-valve, DOHC, 4-stroke with titanium
valves features 95mm bore and 62mm stroke delivering,
broad torque curve (for instant hook-up) with
high over-rev capacity and crisp, linear throttle
Reliable, push-button electric start in any
gear adds extra convenience.
High performance 39mm Keihin FCR flat-slide
carburetor with throttle position sensor (TPS)
delivers ultra-precise fuel/air mixing and instant
Dry sump engine carries oil in an aluminum tank
directly in front of the engine for excellent
cooling and optimal protection from rocks or
Digital CD ignition system delivers ultra-precise
spark and 3D timing for faster, stronger engine
response during hard acceleration.
Lightweight crankshaft keeps inertial mass to
a minimum for faster-revving low-rpm response.
Piston features short skirt and small pin boss
diameter to help reduce weight.
Lightweight titanium valves (first ever on an
ATV) and load-reduced springs are super light,
minimizing reciprocating mass for fast-revving,
hard-hitting power delivery across the RPM range.
High-performance stainless steel exhaust header
(and heatshield) is mated to a USFS-approved
spark arrestor which looks trick and resists
The large-capacity radiator is optimally mounted
in the frame to keep the center of gravity low
but away from mud or rock damage and provides
outstanding cooling efficiency.
Additional weight-saving engine features include:
magnesium cylinder head cover & right side crankcase
cover; small-design cam chain tensioner and
oil pump; aluminum oil hose; and light CDI ignition
Ignition coil is integrated into the spark plug
cap, the first time ever used on an ATV, and
is extremely light and compact.
Smooth-shifting YZ-spec ratchet-type manual
5-speed transmission delivers engine’s potent
powerband to the ground with maximum efficiency
Heavy-duty manual clutch features extra-thick
plates specifically designed for the YFZ450.
Large capacity airbox features no-tool access
to the oiled dual foam filter for easy maintenance.
Trick, works-style clutch lever features oversize
barrel adjuster for easy, no tool adjustability
of lever/cable play.
State-of-the-art high-tensile steel chassis
utilizes the most advanced suspension technology
ever fitted to an ATV for pure-competition-spec
performance right off the showroom floor.
Independent aluminum upper A-arm front suspension
features fully adjustable competition-spec Kayaba
piggyback shocks with 9.1" of travel and separate
adjusters for preload, rebound and compression
Rear suspension system is a YZ linkage-type
that features fully adjustable Showa shock with
10.1" of travel and separate adjusters for preload,
rebound and compression damping.
Ultra-rigid cast aluminum swingarm reduces weight
and ensures optimal, flex-free suspension action.
Numerous aluminum components—including the swingarm,
upper A-arms, oil tank and wheels —help keep
overall dry weight down to a paltry 350 pounds,
making this the lightest weight 4-stroke sport
Lightweight front and rear master cylinders,
combined with twin 160mm front discs with twin-piston
calipers and single 200mm rear disc, deliver
incredible stopping power with progressive control
race-bred chassis design creates a short 50.4"
wheelbase and low center of gravity to create
a super-tight turning radius.
Removable aluminum die-cast rear subframe removes
easily for maintenance.
Long, low and narrow YZ-style seat is only 31.5"
high which enhances the low center of gravity
for quick, balanced steering and optimal rider
High-performance 21 x 7R-10 front and 20 x 10R-9
rear Dunlop radials, designed specifically for
the YFZ450, deliver superb, class-leading traction.
Lightweight aluminum wheels help enhance suspension
performance by reducing unsprung weight.
Aggressive YZ-inspired styling of front cowl,
tank, fenders and seat establishes this machine’s
pure competition purpose.
Dual 30-watt multi-reflector halogen headlights
set back in the front cowl add the perfect menacing
appearance. Taillight has an incorporated brake
light for added convenience.
Rugged 45mm-wide serrated footrests provide
excellent grip and rider comfort.
Large-capacity, 2.6 gallon fuel tank ensures
Easy-to-use, toggle link-type handlebar-mounted
parking brake can be set with one hand.
2004 YFZ 450 Specifications
Type: 439cc, 4-Stroke Single, Liquid
Cooled w/ Fan, Titanium 5-Valve DOHC
Bore x Stroke: 95mm x 62mm
Compression Ratio: 11.9:1
Carburetion: Keihin 39mm FCR w/ Throttle
Ignition: DC - CDI
Starting System: Electric
Transmission: 5-Speed Manual Clutch Drive
Train 2WD; Sealed O-Ring Chain
Suspension/Front: Independent Double
Wishbone, 9.1” w/ Compression and Threaded Preload
Suspension/Rear: Aluminum Swing Arm,
10.1” w/ Rebound, Compression and Threaded Preload
Brakes/Front: Dual Hydraulic Disc, Twin
Brakes/Rear: Hydraulic Disc
Tires/Front: AT21 x 7-10 Radial
Tires/Rear: AT20 x 10-9 Radial
L x W x H: 72.4” x 46.1” x 42.9”
Seat Height: 31.5”
Ground Clearance: 4.4”
Fuel Capacity: 2.6 Gallons
Dry Weight: 350 Lbs.
Dual 30W Krypton Multi-reflector Headlights
& 21/5W Brake light
Colors: Team Yamaha Blue/White; White/Red
Warranty: 6 Month (Limited Factory Warranty)
MSRP: $6,899* Available from June 2003
- *Price and specifications subject to change