2001_YZ426F_Press Release

2001 Yamaha Off Road Models.
The arrival two seasons ago of the YZ400F and WR400F 4stroke dirt bikes signalled the beginning of a whole new
era in off-road motorcycling. The influence that these
lightweight high-performance 4-strokes have had on the
off
road
world
is
enormous,
and
to
underline
their
winning potential at any level Andrea Bartolini clinched
the World 500cc Motocross Championship on his YZ400F in
1999.
At the same time as being one of the leading innovators
in
lightweight
high-performance
4-stroke
engine
development, Yamaha has maintained its position at the
forefront of 2-stroke technology, with Jeremy McGrath
convincingly winning the 2000 US Supercross title for
the third successive year on his YZ250.
Now, for the 2001 race season, Yamaha will launch two
all-new lightweight 250cc 4-strokes which are sure to
offer
a
radically
motocross
and
performance
handling
different
enduro
lightweight
performance
alternative
riders
looking
machine
with
that
strong,
to
for
the
many
a
high-
combines
agile
useable
power
characteristics and low maintenance.
Next
year’s
motocrossers
specification
YZ426F,
have
been
upgrades
YZ250,
treated
to
their
YZ125
to
a
and
wide
engine
and
YZ80/LW
range
of
chassis
designs, and the ‘01 TT-R125/LW, TT-R90, PW80 and PW50
fun bikes feature stylish new graphics.
2001 Yamaha Off Road Models Overview
2001 YZ Motocross range
Model
Description
YZ250F
All-new lightweight 250cc 4-stroke motocrosser
YZ426F
Uprated engine and chassis
YZ250
Uprated engine and chassis
YZ125
Uprated engine and chassis
YZ80/LW
Detail changes
2001 YZ426F
Engine and chassis upgrades keep the YZ426F on top!
Throughout Europe and the USA the Yamaha YZ426F has made
its mark as one of the most competitive motocross bikes
around. Whether it’s competing against 250cc 2-strokes
or
larger-capacity
4-strokes,
the
YZ426F’s
agile
handling performance, low weight and free-revving engine
deliver race-winning performance.
To ensure that the YZ426F maintains its winning ways the
latest 2001 model comes with a range of detail changes
to the engine and chassis that combine to give its rider
the edge just when it matters!
Engine
New for 2001 are lightweight titanium valves and lowerrate
springs
across
this
Complementing
revised
which
make
5-valve
this
carburettor
for
improved
engine’s
wide
operating
higher-specification
settings,
as
response
well
right
range.
top-end
as
a
are
revised
ignition timing curve and a new low-friction crankshaft
which work together to deliver instantaneous response.
Weight-saving features include a new-design header pipe
and a modified gearshift mechanism which, together with
chassis
modifications,
help
keep
overall weight down to 105.5 kg.
the
2001
model’s
Chassis
Yamaha’s YZ426F/250/125 models are widely regarded by
amateur and professional MX riders alike as being some
of
the
best-handling
motocross
machinery
on
a
wide
variety of tracks, and to keep things that way all three
models
feature
a
list
of
significant
improvements
to
their suspension and braking systems for 2001.
Please note that the chassis changes described in this
section are featured on all the 2001 YZ426F/YZ250/YZ125
models.
Braking
performance
fitment
of
a
new
gets
250mm
a
boost
diameter
for
2001
floating
with
front
the
disc
which replaces the previous model’s fixed 245mm design.
Slowed by a new twin-pot Nissin caliper operated by a
redesigned
cylinder,
three-piece
this
250mm
brake
lever
floating
and
front
new
master
brake
system
generates strong and progressive stopping power.
At the rear end the YZ426F/250/125 are now fitted with a
lighter swinging arm which is manufactured from thinner
2.8mm high-tensile aluminium. Further weight savings are
made
by
the
use
of
aluminium
components
in
the
construction of the rear shock, which also features a
new
bump
rubber
and
lower-end
needle
bearing
for
enhanced performance.
Other
include
detail
a
new
changes
common
lightweight
to
the
DID520DMA2
YZ426F/250/125
chain,
a
dual
coloured seat featuring a black top section and blue
sides,
a
reshaped
clutch
lever
and
settings which are specific to each model.
modified
fork