July,1999
Adopting technology directly from the YZR250 GP factory machine

Year 2000 model TZ250 debuts with Newly Developed Engine

Sales of 2000 model TZ125 also begin

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


NOTE: This is a translation of a news release issued for the Japanese market.
Copyright(C) 1999 YAMAHA MOTOR CO., LTD. All rights reserved.
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