All-new engine settings including a new ECU and an increase in the compression ratio add power output while dramatically increasing mid-range performance.
New throttle body assembly and muffler shape combine to improve throttle response.
New assist and slipper clutch uses lighter clutch springs which results in a lighter clutch pull to reduce racer/rider fatigue while reducing the effect of engine braking while downshifting.
All-new suspension, including new front and rear shock absorb- ers, reduces weight and provides exceptional handling character- istics and rider comfort.
All-new bodywork design was focused on improving the racer’s/ rider’s ability to move around. New side shrouds improve comfort and reduce fatigue while new heel guards are positioned closer to the chassis to centralize the riding position and provide more room.
New tires from Maxxis with new tread design focus on consis- tent sliding control and awesome traction during cornering.
Yamaha Diagnostic Tool (YDT) has been added to improve service- ability
Assembled in Newnan, GA, U.S.A.
Yamaha
YFZ450R ATV Key Features
The Yamaha YFZ450R ATV is the most technologically advanced sport ATV on the market today. It is simply the top of the line “racing” level Sport ATV. It combines a high-tech, quick-revving, titanium five-valve, 449cc fuel-injected engine with a lightweight, professional-caliber cast aluminum/steel chassis. The power/chassis combina- tion will make for a championship-winning machine time and time again
The YFZ450R is motocross ready. The weldless frame is designed from lightweight aluminum, with a tension- steel bottom frame that lets the engine sit lower for excellent mass centralization. All-new suspension components and settings for 2014 reduce weight while providing light, agile handling characteristics with an excellent balance of sharp handling and rider comfort.
For 2014, all-new bodywork is designed for great ergonomics and rider comfort, with more room to hang off in the corners, and the seat shape is padded in just the right places to improve lap times. Body panels come off easily without tools for service; there’s no need to remove the battery or other components to take the fenders off.
More power for 2014. The 449cc engine uses titanium five-valve cylinder head technology, with new cam pro- files, and a newly designed exhaust system to deliver abundant power in the mid-range to top end, with more “hit” feeling right off idle. The higher compression ratio further improves overall engine performance.
The YFZ450R incorporates Yamaha Fuel Injection for precise fuel delivery. With a big 42mm Mikuni throttle body and 12-hole injector, this system provides excep- tional atomization of the fuel for maximum power. The system also includes ISC (Idle Speed Control) for easy, reliable start-up and warming.
The industry’s first assist and slipper clutch on a Sport ATV reduces clutch lever effort by about 25% for less fatigue while at the same time increasing clutch plate pressure for positive engagement. Additionally, this new clutch system reduces the engine braking effect, which allows faster cornering, particularly when downshifting, and also allows the suspension to absorb bumps better during braking.
Yamaha
YFZ450R ATV Engine
The fuel-injected
449cc engine has superb power characteristics.
Power delivery is smooth and strong
off the line with lots of low and
mid range 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.
Yamaha
YFZ450R ATV Chassis/Suspension
The new body configuration allows more room for even an aggressive racer to move around during the moto. The seat is narrow in the front, yet wide and padded in the rear to reduce fatigue, especially when railing a turn.
The wheel has
been designed with the inner lip
rolled in. This increases the rigidity,
allowing a reduction in weight while
maintaining strength.
Wheels are set
motocross-spec wide, near the maximum allowable 50 inches,
for great cornering ability. The
Dunlop tires are grippy with
a great pattern for cornering, and
at 20 inches in the rear and 21
inches in the front, provide much
better ground clearance than the
competition. That makes the YFZ450R
fun to ride off-road, too.
Large diameter, tapered handlebars reduce vibration and are mounted on 4-way clamps for exceptional adjustability. There are two sets of holes in the handlebar crown and the eccentric clamps so the rider can choose the standard setting, 10mm or 20mm forward, or 10mm back.
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 aluminum 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 9.8 inches of wheel travel means
this racer is up to even the most challenging
tracks.
The new front KYB shocks are longer for increased suspension stroke with superb bump absorption and excellent anti-bottoming characteristics, and they have KashimaTM coating for smooth operation. The 9.8 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, YFZ450R features
dual front hydraulic disc brakes
and a trick looking, lightweight
wave-type rear rotor.
Yamaha YFZ450R ATV 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.
