for 2005 ATV 's:
A new, seat increases comfort over the course of long
motos and has a non-slip surface.
Revised front suspension settings for improved bump
absorption, and reduced rider fatigue.
Aluminum alloy shift and rear brake levers are lighter,
and provide a more positive feel.
YFZ450 ATV Features:
Liquid-cooled, 439cc, 5-valve, DOHC, four-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 response.
Reliable, push-button electric start in any gear adds
Dry sump engine carries oil in an aluminum tank directly
in front of the engine for excellent cooling and optimal
protection from rocks or mud.
Forged piston features short skirt and small pin boss
diameter to help reduce weight.
High performance 39mm Keihin FCR flat-slide carburetor
with throttle position sensor (TPS) delivers ultra-precise
fuel/air mixing and instant throttle response.
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.
Ignition coil is integrated into the spark plug cap,
the first time ever used on an ATV, and is extremely
light and compact.
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 unit.
Trick, works-style clutch lever features oversize barrel
adjuster for easy, no tool adjustability of lever/cable
Independent aluminum upper A-arm front suspension features
fully adjustable competition-spec Kayaba piggyback shocks
with 9.1 inches of travel and separate adjusters for
preload, rebound and compression damping.
Rear suspension system is a YZ linkage-type that features
fully adjustable Showa shock with 10.1 inches of travel
and separate adjusters for preload, rebound and compression
Removable aluminum die-cast rear subframe removes easily
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.
Digital CD ignition system delivers ultra-precise spark
and 3D timing for faster, stronger engine response during
Lightweight crankshaft keeps inertial mass to a minimum
for faster-revving low-rpm response.
High-performance stainless steel exhaust header (and
heatshield) is mated to a USFS-approved spark arrestor
which looks trick and resists corrosion.
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
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.
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.
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.
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 and feel.
Ultra-compact, race-bred chassis design creates a short
50.4-inch wheelbase and low center of gravity to create
a super-tight turning radius.
Long, low and narrow YZ-style seat enhances the low
center of gravity for quick, balanced steering and optimal
Lightweight aluminum wheels help enhance suspension
performance by reducing unsprung weight.
Additional ATV Features:
Aggressive YZ-inspired styling of front cowl, tank,
fenders and seat establishes this machine’s pure
Dual 30-watt multireflector halogen headlights set back
in the front cowl add the perfect menacing appearance.
Taillight has an incorporated brake light for added
Rugged 45mm-wide serrated footrests provide excellent
grip and rider comfort.
Large-capacity, 2.6 gallon fuel tank ensures excellent
Easy-to-use, toggle link-type handlebar-mounted parking
brake can be set with one hand.