Yamaha Motor Co., Ltd. (YMC) will release on the Japanese market
the 2003 model of the production road racer “TZ250” that has won the trust
of road race competitors for the high level of competitiveness it achieves
in race categories from MotoGP GP250cc class to national level racing.
Featuring numerous detail improvements that further boost engine and
chassis performance, the 2003 model TZ250 will be released on Nov. 25,
2002. The 2003 model TZ250 newly adopts several more features from the
factory racer YZR250, such as YZR250 type cylinder body, cowling, seat and
front fender, giving this model top-class competitive potential for the
MotoGP GP250cc class. Ordering and sales of this model will be conducted
through Yamaha RSS shops nationwide. Meanwhile, the TZ125 will
continue to be sold in its present specification.
|
Yamaha Road Racer “TZ250”
(The actual model has no body
coloring.) | |
Release date: |
Nov. 25 for TZ250 |
Advance ordering dates: |
Sept. 1, 2002 ~ Nov. 30, 2002 for
TZ250 |
Achieving performance potential to compete with
the best in the MotoGP GP250cc class based on a YZR250 replica
concept |
Product Summary
The 2003 model TZ250 adopts various
technologies from the MotoGP factory machine YZR250 in the form of
numerous spec changes in the engine and chassis to achieve an extremely
high level of competitiveness. The competitive potential it achieves makes
this model worthy of being called a YZR250 replica. The engine
improvements include the adoption of a YZR250 type cylinder body, and new
carburetor settings, etc., that provide better power feeling across the
full rpm range and improved acceleration performance. The chassis adopts a
YZR250 type cowling, seat and front fender for improved aerodynamics and
top-speed performance, making for more stable handling performance at high
speeds. The TZ250 was the championship machine in the 2001 All Japan
Championships, and in the 2002 All Japan series it swept the top four
places in each of the first five rounds of the season. This kind of
consistent competitiveness has won the TZ250 the trust of riders in the
Japanese market.
Main New Features
-YZR250 type cylinder body
(special type YPVS valve incorporating exhaust branch function)
adopted While maintaining the outstanding characteristics of the
sand cast type crankcase, liquid-cooled 2-stroke, 90°V-twin engine of the
existing model, engine improvements have been made that include the
adoption of a YZR250 type cylinder body (special type YPVS valve
incorporates exhaust branch function), new exhaust timing and a new shape
for the initial scavenging section of the crankcase. The combined effect
of these improvements boosts performance across the entire rpm range. (The
existing model features a slide-type YPVS valve). In particular, the
new cylinder and drum-type YPVS valve boost performance in the low- to
mid-speed range and contribute to reduced exhaust noise. The new exhaust
timing improves performance in the high-speed range, while the new initial
scavenging section shape contributes to better torque
characteristics.
-WPC finish piston for greater
durability The piston features a new shape in the upper portion of
the pin boss for optimized strength balance plus a WPC finish on its outer
surface for greater durability and reduced friction. Durability has also
been increased by changing the shape of the crankcase journal section.
(WPC treatment is a type of treatment for increasing the strength of the
surface layer of a metal that involves high-speed peening of the metal
with a shot of just a few microns. The high-speed peening heats up the
surface to the point where it melts once. Then it is rapidly cooled to
produce stronger crystallization of the metal.)
-YZR250 type
cowling adopted for improved high-speed performance The adoption of
a YZR250 type cowling with right-left opposed ducts, a YZR250 type seat
and front fender combine to provide better aerodynamics and boost top
speed. The accompanying improvement in wind protection also helps reduce
rider fatigue, while the stronger down-force effect improves handling
stability at high speeds. Also, the shapes of the passages from the ducts
to the air box have been optimized to provide more even supply of ram air
to the two cylinders.
-Other specification changes Other
improvements include (1) new carburetor settings, (2) new primary
reduction ratio (1.888 –› 1.938), (3) new shape for the front brake hose
passage for better serviceability, (4) lightweight, shorter silencer
(overall length: 307mm –› 242mm / lighter weight) and (5) a new CDI unit
with revised ignition characteristics, new solenoid duty ratio
characteristics and YPVS operation characteristics.
Yamaha Road Racer "TZ250" Technical
Specifications |
Overall length x width x height
Wheelbase Minimum ground clearance Dry weight
|
1,995mm x 650mm x 1,163mm 1,342mm
112mm 102kg |
Engine type Cylinder arrangement
Displacement Bore x Stroke Compression ratio |
Liquid-cooled, 2-stroke, crankcase reed
valve V-twin 249cc 54.0mm x 54.5mm 7.2~7.7:
1 |
Maximum power Maximum
torque |
93PS(68.4kW)/12,500rpm 5.5kgf-m(53.9N-m)/11,750rpm |
Starting
system Lubrication Engine oil capacity Fuel tank
capacity Carburetion Ignition system |
Push
start Pre-mix 0.5liter 23liter TMXχ 32 x
2 C.D.I. |
Primary / Secondary reduction
ratios Clutch type Transmission type Gear
ratios
Frame type Caster / Trail Tire size(Front /
Rear) Brake type(Front / Rear) Suspension type(Front /
Rear) |
2.524 / 2.571 Dry multiplate coil
spring Constant mesh, forward 6-speed 1st: 1.938 2nd: 1.476
3rd: 1.238 4th: 1.091 5th: 1.000, 6th:0.926 Diamond 22° /
82mm 120/60R 17 / 165/55R 17 Hydraulic, double disc /
Hydraulic, single disc Telescopic / Swing
arm |
Yamaha Road Racer "TZ125" Technical
Specifications |
Overall length x width x height
Wheelbase Minimum ground clearance Dry weight
|
1,828mm x 510mm x 1,033mm 1,242mm
110mm 72.3kg |
Engine type Cylinder arrangement
Displacement Bore x Stroke Compression ratio |
Liquid-cooled, 2-stroke, crankcase reed
valve Single cylinder 124cc 54.0mm x 54.5mm 7.9:
1 |
Maximum power Maximum
torque |
44PS(32.3kW)/12,250rpm 2.55kgf-m(25.0N-m)/12,000rpm |
Starting
system Lubrication Engine oil capacity Fuel tank
capacity Carburetion Ignition system |
Push
start Pre-mix 0.3liter 13liter PWM38 x
1 C.D.I. |
Primary / Secondary Clutch type
Transmission type Gear ratios
Frame type Caster /
Trail Tire size(Front / Rear) Brake type(Front /
Rear) Suspension type(Front / Rear) |
2.857 / 2.118 Dry multiplate coil
spring Constant mesh, forward 6-speed 1st: 2.000 2nd:1.632
3rd: 1.412 4th:1.250 5th: 1.143, 6th:1.083 Diamond 22.6°/
85.5mm 95/70R 17 / 115/70R 17 Hydraulic, single disc /
Hydraulic, single disc Telescopic / Swing
arm |
|