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Autore: Alessandro
Yamaha RZ250 (4L3) w/Cowl (1982) Hasegawa 

Yamaha RZ250 (4L3) w/Cowl (1982) Hasegawa 

  • Scale: 1:12
  • Item no: 21758(21758)
  • Estimated No. of parts: 150
  • Category: Japanese Motorcycle
  • length: 174mm
  • width: 65.5mm

Yamaha RZ250

RZ (RZ) is a motorcycle that was once produced by Yamaha Motor and was produced as a production model of displacement.

It is the successor model of the RD , and is the name of a 250cc motorcycle sold exclusively for the domestic market by Yamaha Motor Co., Ltd. in August 1980.

In the 1970s, as automobile exhaust gas regulations were tightened mainly in North America and the use of 2-stroke engines became stricter, the idea was to create the last 2-stroke sports model.

The “R” in “RZ” was originally a symbol within Yamaha that meant 350cc, but the “Z” meant water cooling . In addition, it is said to be derived from the last letter of the alphabet and also has the meaning of final and ultimate.

The engine, which was designed with a focus on the basic running performance of a sports bike, adopted a water-cooled 2-stroke parallel 2-cylinder layout with the same bore and stroke (54mm x 54mm) as the TZ, the company’s commercial racer at the time, and was one of the best in its class. It boasted the top 35ps at the time. In addition to making extensive use of resin parts to reduce weight, the rear suspension featured the most advanced features at the time, including a cantilever-type monoshock (monocross suspension), which was the first of its kind on a road sports model, newly designed cast wheels, and large halogen headlights . Equipped with items. Perhaps due to the fact that it was released in August 1980 after a wait of almost a year since it was first introduced in a scoop article in a motorcycle magazine in 1979, the situation continued for a while, with a wait of three months from order to delivery. It became a big hit. The styling and design by GK Industrial Design Institute Co., Ltd. (currently GK Dynamics Co., Ltd.) was also well received. The initial white model, also known as the Hinomaru color, has a beautiful pearl paint (later white models are solid white).

It was also known for its high riding performance and was nicknamed the “400 killer” because its performance more than equaled that of the larger displacement 400cc 4-stroke class. The power-to-weight ratio, considered a measure of a vehicle’s handling performance, was 3.97 kg/ps, which was on par with the 400cc 4-stroke class at the time. The use of a chambered muffler (with expansion chamber) on commercial vehicles was rare at the time and not only improved the racing image of the car, but also helped improve its performance. Although the drive system had high performance, the braking (brake) system used a single disc at the front and a drum brake at the rear, so braking performance would be poor or insufficient. For this reason, many cars use 350 specification dual front discs.

After the introduction of this car, other companies also launched 2-stroke sports models to compete. This led to the subsequent boom in racing replicas and spec competition in the 250cc class.