Every pack has a leader. And in the competitive middleweight
cruiser division, Yamaha's all new XVS950A just set the new
benchmark.
Riders looking for their first cruiser have many different
models to choose from. And, like most buyers, they want their new
bike to have everything. They want a full-size chassis that looks
great. They want a muscular, large-displacement engine. And they
want a high-quality finish.
Yamaha has now built the cruiser for those who want it all - the
XVS950A is designed for the new cruiser rider who wants a machine
with the power, feel and presence of a full-size cruiser, but with
the rider-friendly qualities to make the bike easy and fun to
ride.
The XVS950A combines the feel-good power and gutsy acceleration
of a big V-Twin engine, with a full-size feel and responsive
handling qualities. The result is a rider-friendly cruiser that
makes the rider feel safe and secure.
Powered by a newly-designed 942cc high-torque air-cooled V-twin
SOHC engine housed in an easy-handling long-and-low chassis, the
all-new XVS950A brings an exciting and refreshing 'new style
classic' look to the sub 1000cc cruiser category.
With its low seat height, and class-leading modern styling, the
easy-to-handle XVS950A opens up a new chapter in cruiser design.
For 2009 those wild-at-heart riders of all riding abilities will
have the chance to own a genuine V-twin cruiser whose looks, image,
character and performance ensure that it delivers real street
credibility.
Although the machine benefits from the use of advanced Yamaha
technology, great care has been taken to ensure that this new bike
retains the essential simplicity of design that characterises every
classic cruiser.
For example, our engineers spent a great deal of time tuning the
new exhaust system in order to accentuate the soulful low-frequency
sounds and eliminate high frequency noise. Likewise, much effort
was put into creating an efficient intake system which not only
enhances performance, but also emits a good intake sound boost
pulse feeling from low speeds right through to the high speed
range.
The new XVS950A runs with a large-diameter 18-inch front wheel
in order to lighten the handling feel and emphasise the bike's
image of lightness - and for ease of use and enhanced
controllability, the fuel tank narrows considerably at the
rear.
This extreme attention to every detail - however small - is
evident throughout the machine, and the end result is a high
quality machine which adds a new dimension to the cruiser world.
With its high-torque V-twin air-cooled engine, steel fenders, belt
drive and long and low style - as well as new-style classic cruiser
looks and a simple, clean-cut design, the all-new machine delivers
full-sized performance with a lightweight feel and easy
handling.
Engine features
In order to achieve the design team's goals of creating a new
generation cruiser with a lightweight feel and class leading
performance, the XVS950A is driven by a newly-designed high-torque
942cc air-cooled V-twin 4-valve SOHC engine with fuel injection
that produces more power than any cruiser in this class.
For optimum low to mid-range performance, the 942cc engine runs
with almost 'square' bore x stroke dimensions of 85.0 mm x 83.0 mm,
and the highly efficient pent-roof combustion chamber delivers a
compression ratio of 9.0:1. (For comparison, the XVS1300A features
a bore x stroke of 100.0 mm x 83.0 mm, and a compression ratio of
9.5:1.) The combination of a 4-valve head with a pent-roof
combustion chamber and a 'square' configuration gives the engine a
punchy torque output for strong acceleration and rapid overtaking
potential.
This compact new V-twin engine utilises the same three axes
(crankshaft/front cylinder cam/rear cylinder cam) as the
larger-capacity XVS1300A to give a compact V-bank, but it has a
very different power delivery character as a result of the
elimination of the balancer mechanism. By not equipping this new
V-twin with a balancer mechanism, our engineers have been able to
enhance the pulse feeling and also minimise the new engine's
crankcase dimensions and weight.
In addition, the decision to adopt air cooling has given our
designers more freedom in creating a clean and simple profile which
further emphasises the light feel and image of this new-generation
cruiser.
This gutsy new 942cc 60° V-twin also features
state-of-the-art internals, including lightweight forged pistons, a
ceramic plated cylinder and highly efficient 4-valve cylinder head,
as well as many newly-designed components including cams, valves,
throttle body, oil pump, crankshaft, connecting rods, clutch,
transmission gears, crankcase cover and exhaust system.
Optimized squish area design
In any big-bore engine design, the combustion flame must travel a
greater distance than on a smaller bore engine, and so in order to
ensure high combustion efficiency, the new XVS950A engine features
pent-roof combustion chambers with a specially-designed squish
area. By forcing the fuel/air mix towards the centre of the
combustion chamber more quickly, the optimized squish area gives a
faster combustion speed, which gives stronger throttle response and
higher levels of performance.
60º V-twin engine design with uneven firing
interval
One of the most significant and defining features to be found on
the new 942cc V-twin engine is the uneven firing interval.
Combustion takes place at 300º and 420º, which makes for
a distinctive and pleasing engine pulse, and it is this uneven beat
that gives the new XVS950A such an appealing and special character,
as well as a gutsy exhaust note.
In order to enhance the lightweight feeling with pulse generated
by the uneven firing sequence, this new V-twin engine features no
balancer shaft, which not only strengthens the character, but also
makes for easy revving and strong response. Vibration is minimised
by the use of lightweight forged pistons and connecting rods, and
rubber mounts for the handlebars and footboards ensures high levels
of rider comfort.
Eliminating the balancer shaft also brings with it a number of
other advantages, including reduced gear noise, lower engine
weight, and more efficient engine operation and better response
thanks to a decrease in pumping losses.
This compact new engine also features a 60º cylinder bank,
and this relatively narrow angle between the two air-cooled
cylinders contributes to the bike's concentration of mass, which
accentuates the lighter handling feeling - a central theme of this
new-generation cruiser's very special character.
Specially-shaped cylinder fins
The 950A's muscular looking air-cooled V-twin engine is the focal
point of this new-generation cruiser, and the beautifully-designed
cylinder fin layout adds to the appeal of the classic V-twin
architecture. By shaping the fins so that those at the top of the
cylinder are wider than those at the base, each cylinder's fin
outline creates a V-form, with the sharp end of the 'V' pointing
towards the centre of the crank axis.
This design feature underlines the classic cruiser image of the
XVS950A, and is complemented by the buff finish on the cylinder
head fins to give a handsome, high quality feel to the bike. Few
engines capture the original spirit of motorcycling as well as the
classic V-twin layout, and by specially shaping the air-cooling
fins to form a 'V' profile, Yamaha's designers have succeeded in
creating an authentic modern-day classic.
Right side-mounted air intake
The compact new 942cc V-twin has been developed to produce strong
low to mid-range torque with punchy performance, and in order to
ensure outstanding intake efficiency a large-capacity 3-litre air
cleaner box is mounted on the right side of the V-cylinder block.
Featuring a triangular shape, and located between the 60°
V-bank, this stylish air box emphasises the V-twin
configuration.
For optimal efficiency combined with a pleasing intake sound,
particular attention has been paid to the design of the ducting
which has been specially tuned to produce the right note. At lower
speeds the intake emits a throaty burble, while at higher speeds
the intake note complements the exhaust sound to accentuate the
engine's pulse feel.
Fuel injection
For strong performance across the rpm range, together with
minimised emissions, the 4-valve cylinder head's pent-roof
combustion chambers are fed by a sophisticated 4-hole,
2-directional fuel injection system. Equipped with a 35 mm diameter
throttle body, these injectors aim the spray directly at the valve
surfaces which ensures good atomisation of the fuel for faster and
more complete combustion.
Various sensors transmit data on air temperature, atmospheric
and intake air pressure, engine temperature, crank position, speed,
throttle position and exhaust oxygen levels to the ECU which then
adjusts the fuel injection system to ensure optimal combustion
efficiency.
This system is designed to offer excellent drivability together
with instant response and efficient operation, and for outstanding
idling stability which is set at 950-1050 rpm, an Idle Speed
Control (ISC) valve is fitted.
Forged aluminium pistons and ceramic composite plated
cylinders
In addition to its high performance 4-valve cylinder head design
and highly efficient fuel injection system, the latest addition to
Yamaha's cruiser family benefits from new lightweight forged
aluminium pistons. As well as being immensely strong, the XVS950A's
compact forged pistons also help to reduce reciprocating weight,
which in turn makes for a smoother running engine and also makes
for excellent throttle response.
The running efficiency of these lightweight forged pistons run
is further enhanced by the use of ceramic composite plated
cylinders, which ensure more effective heat dissipation, and also
help to minimise oil consumption.
Roller rocker arm for smoother engine
performance
This new-generation cruiser benefits from a number of design
features aimed at enhancing both the feel and the performance of
the new V-twin engine, including the elimination of the balancer,
as well as the adoption of an uneven firing sequence and the
fitment of an efficient fuel injection system.
Another important feature which plays a vital part in making
this one of the most impressive performers in the class is the
roller rocker arm valve lift mechanism.
The XVS950A's advanced rocker arm design features a revolving
slipper mounted on a needle roller bearing, which dramatically
reduces the friction normally generated between a conventional
slipper and the cam - which features a tough Isonite coating for
optimum engine performance. In addition to reducing frictional
losses, this roller rocker arm also permits the use of a cam and
valve spring design that gives a softer valve seating speed.
Another advantage is that valve overlap can be reduced for stronger
low to mid-range performance, and exhaust emissions can also be
cut.
Right-side exhaust system with 2-1 muffler and 3-way
catalytic converter
The exhaust system has been developed to complement the new fuel
injection system's settings, and features a neat 2-1 design running
along the bike's right side. The muffler is a simple two-stage
expansion type design which has been designed to accentuate the
feel and character of the engine's uneven firing sequence, and to
give a good strong pulse in the low to mid-range.
This compact and minimalist two-into-one exhaust system is
equipped with an oxygen sensor which transmits data to the ECU to
ensure the optimal fuel/air mix is injected for efficient
combustion, and a 3-way catalytic converter ensures that this new
V-twin surpasses EU3 requirements.
The distinctive beat of the engine is one of the most striking
features of the new XVS950A, and the quality of the bike's exhaust
note is the result of intensive testing. Our engineers have
developed a system in which high frequency sounds have been
eliminated, and the low frequency note was accentuated, in order to
ensure a gutsy and evocative exhaust note.
Smooth-shifting 5-speed transmission
The new XVS950A's transmission has been designed specifically to
accentuate the gutsy character of the new air-cooled V-twin engine.
The five gear ratios have been carefully chosen so that they enable
the rider to enjoy fully the bike's remarkably strong low to
mid-range torque wave, and fifth gear has been set to deliver
relaxed and comfortable cruising.
The gears also feature a straight-cut type dog design for even
smoother shifting, and this - together with the instant supply of
torque at the twist of the throttle - makes for a relaxing and
enjoyable riding experience, together with spirited
acceleration.
Engine - Technical Highlights
- All-new 942cc air-cooled V-twin 4-valve SOHC engine
- Bore x stroke 85 mm x 83 mm
- 9.0:1 compression ratio
- Compact 60º V-twin design
- Uneven firing interval at 300º and 420º
- Rich character engine pulse
- Pent roof combustion chambers
- Strong low to mid-range torque
- Elimination of balancer shaft for reduced weight and stronger
engine pulse feeling
- Specially-shaped tapered cylinder fin layout for classic V-twin
style
- Right side-mounted air intake with tuned induction noise
- Large-capacity 3-litre air cleaner box
- Efficient fuel injection for instant response and reduced
emissions
- Optimised squish area design for efficient combustion
- Forged aluminium pistons and ceramic composite plated
cylinders
- Roller rocker arms for smoother engine performance
- Right-side 2-1 muffler and 3-way catalytic converter
- Smooth-shifting 5-speed transmission with straight-cut gear
dogs
Chassis features
The XVS950A's new double cradle steel frame has been designed to
deliver a lightweight handling feeling, and this has been achieved
by designing a structure which offers varying degrees of rigidity
in different areas in order to achieve an idealised rigidity
balance. The new frame is especially rigid around the head pipe
area, whilst the torsional rigidity is set at a relatively lower
level in order to introduce a degree of forgiveness into the
handling characteristics, which makes for high levels of surface
feedback and increased rider comfort.
The relationship between the frame's torsional, lateral and
longitudinal rigidity levels has been carefully selected by our
engineers following extensive testing, and the result is a chassis
whose roadholding and handling characteristics complement the
performance of the high-torque engine.
From an aesthetic point of view, the design of the new double
cradle frame projects an image of simplicity and functionality,
which perfectly matches the classic lines of the new air-cooled
V-twin powerplant. The engine is mounted to the frame with rigid
mounts, with one at the cylinder head and three on the crankcase,
and by using the engine as a stressed member the overall chassis
weight can be minimized. The four rigid engine mounts also help to
accentuate the uneven firing pulse feeling, to give a rich
character and enjoyable riding experience.
Long-wheelbase lightweight chassis
Running with a wheelbase of 1685 mm, this new generation Yamaha
cruiser has the longest wheelbase in its class, and although it
measures only 5mm less than the XVS1300A, the stylish new XVS950A
is actually a full 25kg lighter than its bigger brother fully
fuelled.
Compared to other machines in its class, the XVS950 delivers a
much lighter and sportier handling experience, and one of the major
contributors to this aspect of the bike's character is the
positioning of the air-cooled V-twin engine. Compared to the larger
XVS1300A, the new XVS950A's engine sits further forward in the
chassis to give more weight over the front wheel for an optimised
front/rear weight distribution.
In addition to the sportier front/rear weight bias, this new
Yamaha cruiser features a caster angle of 32°10', which, when
combined with a trail of 145mm and the increased front wheel weight
loading, ensures outstanding handling performance in a wide range
of conditions, from relaxed highway cruising through to sporty
riding on winding roads.
Low seat height
In order to ensure that the new bike delivers the high levels of
riding comfort and ease of use that our designers set out to
achieve, a low seat height of only 675mm is featured, compared to
715mm on the XVS1300A.
This newly designed seat is narrow at the front, in order to match
the slim rear section of the new fuel tank, and this makes it
easier for riders to put their feet on the ground when stationary
or riding at low speeds in traffic jams. Combined with the tapered
fuel tank - as well as the angle of bend used in the pull-back
handlebars, and the position of the footboards, this low seat gives
a natural riding position which enhances overall comfort and
controllability.
18-inch front wheel with 130/70-18 tyre
Another important factor which makes a significant contribution to
the bike's lightweight handling and steering qualities is the use
of an 18-inch front wheel fitted with a relatively narrow 130/70-18
front tyre.
One of the main goals of the Yamaha's XVS950A design team was to
create a new type of cruiser which would offer light and easy
handling characteristics, and the use of this narrower, lower
profile 18-inch front tyre is a key element in achieving these
aims.
In classic cruiser tradition, a wide-section 170/70-16 rear tyre
is fitted for optimal traction and excellent rider and passenger
cruising comfort.
Newly-designed aluminium wheels front and
rear
The newly-designed 8-spoke front and rear wheels complement the
bike's classic, lightweight and sporty cruiser design, and help to
minimise the unsprung weight for smooth and responsive suspension
action. The front wheel is 18 x MT3.50, while the rear measures 16
x MT4.50.
Furthermore, the spokes feature a two-prong design where they
meet the rim, which accentuates the image of lightness which
characterises this excitingly different new cruiser.
Steel front and rear fenders
The new XVS950A is equipped with steel front and rear fenders to
underline its classic style.
At the front end the slimline fender features a short front
section and a flared rear end which accentuates the size of the new
larger-diameter 18-inch front wheel, while the steel rear fender is
cut horizontally at mid-wheel height for a classic cruiser
look.
Teardrop fuel tank with wide upper surface
By using 3D CAD techniques, Yamaha's designers have succeeded in
creating a classic teardrop fuel tank which looks light and slim,
and yet has a sizeable capacity of 17 litres. Viewed from the side,
this stylish tank has a low profile and looks extremely slim - even
though there is a built-in fuel pump - giving this cruiser an even
lighter look.
In traditional cruiser fashion, the teardrop shaped fuel tank
has a wide upper surface, and viewed from above this beautifully
sculpted design tapers towards the rear to give a very slim section
near the rider's knees, making it easy to get both feet on the
ground. The sharply tapered shape also underlines the bike's sporty
image, and gives a visual expression of speed.
This new fuel tank is a distinctive styling element to be seen
on the XVS950A, and it has been manufactured using Yamaha's
exclusive pressing technology which enables the production of
increasingly complex and intricate components.
A long and low body with a "New-Style Classic"
image
What sets this new cruiser apart from other designs is its long and
low profile which Yamaha describe as the 'New Style Classic' image.
Unlike many other more traditionally styled cruisers where the
rider sits 'in' the bike in the 'valley' formed by the elevated
fuel tank and the high pillion seat and rear fender, the XVS950A
rider feels more like he or she is sitting 'on' the bike.
Viewed from the side, the horizontally-cut rear fender, flat
pillion seat and low profile fuel tank on this new cruiser form a
much flatter upper surface, in a similar style to the
'NeoStreamline' design of the XV1900A/AS Roadliner.
The long, low and horizontal profile gives the machine an
individual style, and accentuates the impression of lightness. This
image is strengthened by the apparent simplicity of the tubular
double-cradle frame's design, which features an abundance of space
around the head pipe area. The large-diameter front wheel and its
relatively narrow, low-profile tyre add to the lightweight
appearance, while the muscular looks of the timelessly-styled
air-cooled V-twin engine with its beautifully sculpted fins
reinforce the XVS950A's 'New-Style Classic' looks.
Finally, the bike's distinctive character is underlined by the
narrow, flared front fender, compact headlight assembly, right side
air-intake and simple 2-1 exhaust system.
Aramid-type belt drive
Like the larger capacity XVS/XV models, the new model is equipped
with a durable and efficient belt drive system. Manufactured using
aramid, this 28.6mm wide belt drive is an extremely effective way
of transmitting the high levels of torque produced by the V-twin
engine, and its lightness makes it an ideal match for a machine
with such a long swingarm.
Offering excellent strength as well as good shock absorbing
properties and resistance to corrosion, this low-maintenance belt
drive system allows the rider to enjoy the XVS950A's high-torque
and uneven firing pulses to the full.
Front and rear suspension systems with optimised
settings
The front and rear suspension systems are designed to deliver a
smooth, comfortable ride, together with the ability to handle
everything from highway cruising with a passenger through to solo
riding on twisty back roads.
Equipped with 41mm diameter inner tubes and giving 135mm of
travel, the conventional-type front forks feature a wide pitch of
240 mm, and are offset by 45mm. Although these heavy-duty forks
appear externally identical to the design featured on the XVS1300A,
the settings have been revised to suit the lighter XVS950A, and the
spring rate is reduced by around 27% to 5.4N/mm, which ensures
smooth suspension action and high levels of comfort.
Running with a caster of 32°10' and a trail of 145mm, this
high quality front end ensures good manoeuvrability together with
easy steering over a wide range of riding speeds and surface
conditions.
At the rear end is a bottom link-type Monocross system which is
similar to the design used on the XVS1300A, and offers 110mm of
rear wheel travel. For high levels of rider and passenger comfort
the preload-adjustable rear suspension is designed to offer a soft
initial stroke which becomes progressively firmer as the suspension
is compressed further. Together with the smooth-action front forks,
this Monocross rear suspension system ensures that the XVS950A
delivers high levels of comfort and excellent roadholding in a
variety of situations.
Large-diameter 320mm front disc brake
For smooth and strong braking performance a large-diameter 320mm
single front disc brake and 2-piston pin/slide caliper is used. To
ensure effective operation together with accurate feel, close
attention has been paid to optimising virtually every element of
this lightweight braking system's design, including the lever
ratio, lever shape, master cylinder diameter, brake hose expansion
rate and caliper rigidity.
Compared to some heavier cruisers which feature dual-disc front
braking systems, the single large-diameter disc featured on the
lighter XVS950A offers reduced unsprung weight for more responsive
front suspension action. In addition to the weight savings, the
single front disc also emphasises the lightweight image of this new
cruiser.
This impression of lightness and simplicity is further
strengthened by the 298mm diameter rear disc which is equipped with
an underslung caliper.
Cast aluminium upper triple clamp
For an optimum balance of strength and rigidity, the upper triple
clamp is manufactured from cast aluminium, while the lower triple
clamp is made from steel. This combination of steel and aluminium
clamps - which is also used on the XVS1300A - ensures a good
steering feeling together with excellent feedback.
New-design large-diameter instrument panel
Mounted on the new slimline fuel tank is a new-design
large-diameter instrument panel which is framed by a wide
chrome-plated cover which highlights the bike's classic style.
The panel includes an analogue speedometer, as well as six
indicator lights including fuel and oil level warning lights -
while the multi-function LCD display features an odometer with two
trip functions, as well as a fuel trip meter and clock. There is
also a useful instrumentation illumination adjuster which can be
operated from the left side handlebar switch, allowing riders to
increase or decrease brightness of the LCD displays to suit the
conditions.
Chassis - Technical Highlights
- New-design double-cradle tubular steel frame
- 1685 mm long-wheelbase, easy-handling chassis
- Low seat height of 675mm
- 18-inch front wheel for light feeling steering
- 130/70-18 front tyre
- Newly designed lightweight 8-spoke aluminium wheels front and
rear
- Front wheel: 18 x MT3.50; rear wheel: 16 x MT4.50.
- Classic front and rear steel fenders
- Slim 17 litre tapered teardrop fuel tank with wide and flat
upper surface
- A long and low body with a "New-Style Classic" image
- Front forks with 41mm inner tubes giving mm135mm wheel
travel
- Bottom link type Monocross rear suspension giving 110mm wheel
travel
- Front and rear suspension systems with optimized settings
- Large-diameter 320mm front disc brake, 298mm diameter rear disc
brake
- Cast aluminium upper triple clamp
- New-design large-diameter multi-function instrument panel
- Belt drive system
For further information contact:
Sean Goldhawk, advertising and PR co-ordinator
Yamaha Motor Australia,
489-493 Victoria Street, Wetherill Park, NSW 2164
Office: (02) 9757 0068
Mob: 0438 423844
Fax: (02) 9757 1384
Website: www.yamaha-motor.com.au