November 1999 will see the domestic market release of Yamaha
Motor Co., Ltd.'s new (year 2000 model) TZ250 production road racer
powered up with technologies taken directly from Yamaha's high-performance
YZR250 factory machines competing in the World GP. In addition to mounting
a newly developed engine, this model's competitive potential has been
greatly increased with the adoption of improvements to the various chassis
components. As for the new year 2000 model TZ125 also to be released
in November, it inherits all the outstanding qualities of the existing
'99 model will adding improved engine and handling characteristics for
even greater competitiveness. Orders can be placed and purchases made
for these models at all Yamaha RSS shops throughout Japan.
2000 Yamaha Road Racer TZ250
mounting new-design engine with technical feedback from the
YZR250
Product summary The year 2000 TZ250 is a model that adopts
technologies directly from Yamaha's YZR250 factory machines presently
competing with such success in the World GP in order to deliver the kind
of high-level competitiveness expected in a production road racer.
Mounting a completely new-design engine on a lightweight Deltabox frame,
this model achieves a level of performance worthy of wearing the title of
"fastest production road racer."
Main
features
New-design engine with big increase in max. power
output A newly developed engine with a sand cast type crankcase has
been adopted. With generous applications of YZR250 technology in its
various components, this high-power engine achieves a max. power output 5
ps higher than the existing model at 92 ps at 12,250 rpm. This is the
result of the adoption of a high-rigidity sand cast type crankcase and
optimization of the various component specifications. Specifically, (1)
the bore x stroke has been changed to t he same 54mm x 54.5mm as the
YZR250 (existing model: 56mm x 50.7mm), (2) the intake maniford has been
straightened, (3) a new-design cylinder adopted, (4) the exhaust pipe
dimensions have been changed, (5) a new-shape reed valve adopted, (6) the
piston pin diameter reduced, (7) the size of the smaller diameter
connecting rod reduced and more. In combination with an ideally matched
TMX carburetor, these changes produce stronger power development across t
he entire rpm range, outstanding traction coming out of corners and
improved acceleration performance.
New lightweight frame
contributes to excellent intake efficiency On the aluminum Deltabox
frame, the duct layout has been newly designed with the aim of improving
the efficiency of the induction system. Changes primarily in the designs
of the cast parts has resulted in a weight reduction of 500 grams (frame
itself). Furthermore, detail design changes have been made in such areas
as the positioning and structure of the engine mounts that improve
serviceability.
Spec changes in front and rear
suspensions A new-design rear suspension link has been adopted that
changes the point of attachment for the rear suspension. A change in the
cushioning of the rear shock absorber with a longer stroke (43 -> 55mm)
and change in the overall length of the spring (160 -> 150mm) has
improved traction performance and handling, As for the front suspension,
its characteristics have been changed to improve the feeling of road
grip.
Other features A variety of other improvements
include (1) a change in the fuel tank shape(regulation compliance), (2)
change in the shape of the front and rear wheel bearings (reduced
horsepower loss) and (3) tachometer with built-in digital temperature
gauge (reduced weight, increased accuracy)
Year 2000 model Yamaha Road Racer
TZ125
Product summary The '99 Yamaha Road Racer TZ125 maintains the
outstanding performance features of the existing model while adding detail
changes that increase the maturity of the various components, further
strengthening its competitive potential. In the engine, the shapes of the
cylinder ports have been re-designed to improve power development
characteristics and numerous detail changes adopted that improve
reliability. Meanwhile, overall maturity of the frame has been achieved
with the adoption of items like a lighter rear frame made of small-gauge
pipe.
Main feature changes
Cylinder and
exhaust pipe changes The shapes of the ducts in the main scavenging
ports and auxiliary scavenging ports have been changed. Also, the exhaust
pipe has been made straighter for improved power development
characteristics.
Lightened rear frame The gauge of the
pipe used in the rear frame has been reduced (pipe wall thickness: 2 ->
1.4 mm) for a further reduction in weight.
New front tire size
and change in suspension spec The size of the front tire has been
changed (90/70R17 -> 95/70R17). Meanwhile, changes including (1)
increased adjustment range on the compression-stroke cushioning and (2)
new spring spacer material (steel -> aluminum) have been made to
increase setting range and reduce weight.
Other
features Other changes include (1) a change in the fuel tank shape
(regulation compliance), (2) adoption of a lower friction rear wheel
bearing (3) adoption of a tachometer with built-in digital temperature
gauge (reduced weight, increased accuracy), (4) revised ignition
characteristics in the C.D.I. unit, (5) new foot rest and (6) new brake
pedal.
Year 2000 Yamaha Road Racer TZ250 Technical
Specifications
Overall length x width x
height Wheelbase Minimum ground clearance Dry weight |
1995 x 650 x 1083
mm 1342mm 112mm 102kg |
Engine type Cylinder
arrangement Displacement Bore x stroke Compression ratio
Maximum power (ps/rpm) Maximum torque (kgf-m/rpm) |
Liquid Cooled 2-Stroke
Crankcase Reed Valve V-twin 249cc 54.0 x 54.5
mm 7.2~7.7:1 92PS (67.7kW)/12250 rpm 5.4kgf-m
(52.9N-m)/11750 rpm |
Starting System Lubrication
Oil tank capacity Fuel tank capacity Carburetion
Ignition system Primary/Secondary reduction ratio Clutch
type Transmission type Gear ratios |
Push start Pre-mix 0.5
liter 23 liter TM38c x2 C.D.I. 2.524/2.571 Dry,
Multiplate coil spring Constant Mesh 6-speed 1st: 1.889, 2nd:
1.476, 3rd: 1.261, 4th: 1.080, 5th: 0.963, 6th: 0.909
|
Frame type
Caster/Trail Tire size (front-rear) Brake type (front and
rear) Suspension (front/rear) |
Diamond 22 degrees/82
mm 3.10/4.80 R17-165/55 R17 Hydraulic Double Disc/ Hydraulic
Single Disc/ Telescopic/Swinging
arm |
Year 2000 Yamaha Road Racer TZ125 Technical
Specifications
Overall length x width x
height Wheelbase Minimum ground clearance Dry weight |
1828 x 510 x 1033 mm 1242
mm 110mm 72.3 kg |
Type Cylinder
arrangement Displacement Bore x stroke Compression ratio
Maximum power (ps/rpm) Maximum torque (kgf-m/rpm) |
Liquid Cooled 2-Stroke Crankcase Reed
Valve Single 124 cc 54.0 x 54.5 mm 7.9:1 44PS
(32.3kW)/12250 rpm 2.55kf-m (25.0N-m)12000 rpm |
Starting
System Lubrication Oil tank capacity Fuel tank capacity
Carburetion Ignition system Primary/Secondary reduction
ratio Clutch type Transmission type Gear ratios |
Push start Pre-mix 0.3 liter 13
liter PWM38x1 C.D.I. 2.857/ 2.118 Dry, Multiplate coil
spring Constant Mesh 6-speed 1st: 2.000, 2nd: 1.632, 3rd:
1.412, 4th: 1.250, 5th: 1.143, 6th: 1.083 |
Frame type
Caster/Trail Tire size (front-rear) Brake type (front and
rear) Suspension (front/rear) |
Diamond 22.6 degrees/85.5 mm 95/70
R17-125/55 R17 Hydraulic Single Disc Telescopic/Swinging
arm
|
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