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1990 Yamaha R1-Z Specifications

  1990 Yamaha R1-Z Specifications

1990 Yamaha R1-Z 

Yamaha R1-Z Was a Streetbike that manufactured by Yamaha With 2-Stroke 249cc Engine. It's Quite Good For beginner that Yamaha R1-Z Seat height is 775 mm and it has restricted Top Speed For Yamaha Market In 180 Km/H.
 The racer replica boom that started from the 1983 RG250Γ debut swept the 1980s. However, the radical and rapid performance improvement that pursued the speed on the circuit too much led to the general riders leaving the replica. 
As a reaction, Kawasaki Zephyr, who appeared in 1989 as an air-cooled steel frame, 2 suspensions, and a 70s-style style sports bike, was a big hit. It becomes a big boom to establish the genre called Naked.

This boom quickly spread to all classes from 250cc to liter over, and as a result of the big wave spreading not only to 4 strikes but also to 2 strike 250 sports, 2 St Naked was born in 1990, R1-Z It will be that.

As you can see from the car name, the R1-Z is a model that aims to revive the RZ image. A 2-stroke, water-cooled, parallel 2-cylinder engine is installed in a frame that uses a steel truss structure. 
However, the engine is not an RZ / RZR system, but the original TZR250 is refined to a power characteristic that is easy to handle by reducing the carburetor aperture, changing the ignition timing, mission, and secondary reduction ratio. 
Power performance and handling are tailored so that you can feel the joy of maneuvering, not absolute performance like a replica. The styling also appealed to the new R1-Z personality, such as the arrangement of two mufflers on the right side, while giving the traditional atmosphere of the RZ series. 
Characters that can completely enjoy the fun of the two strikes, which are in line with the two strike replicas, have gained a certain level of popularity.

In the first minor change in the fall of 1991, the year after the debut, reinforcements were added to the frame and swing arm, the front and rear suspensions were changed, and the front brake rotor was reduced in diameter. 
The minor changes at the end of 1992 were that the maximum output was lowered from 45PS to 40PS due to the change in the maximum output voluntary regulation of the 250cc class, and that radial tires were installed as standard. In addition, minor improvements were made to the electrical system.

This model was then sold for a long time until 1999 and ended as one of the last domestic 2 strike 250 sports.

Engine Model Water- cooled 2-stroke / Crankcase Reed Valve Parallel 2-cylinder
Total Displacement
249㏄ Inner ╳ Process 56.4╳50.0㎜
Compression Ratio 6.4
Maximum Output 45PS /
8500rpm Maximum Torque 3.4㎏-m / 7500rpm
Fuel Supply system Carburetor
Transmission type Always meshing 6-speed return Overall
length 2005
㎜ Full width 700 ㎜ Overall
height 1040 ㎜
Axle distance 1380 ㎜
Seat height 775 ㎜
Dry weight 134
Caster 24 ° 50 ′
trail 92 ㎜
Fuel tank capacity 16.0L
tire size (front 110 / 70R17
tire size (rear) 140 / 70R17