Yamaha RD 125

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Yamaha
Yamaha Motor logo.svg
RD 125 / DX / LC / LC YPVS
Manufacturer Yamaha Motor Co., Ltd
Sales description RD 125
Production period 1973 to 1990
class motorcycle
design type Sports tourers / super athletes
Motor data
air-cooled two-cylinder- later liquid-cooled single-cylinder engine, two-stroke
Displacement  (cm³) 124 or 123
Power  (kW / PS ) 12/16 to 16.9 / 23 at 7500 to 9500 min -1
Torque  ( N m ) 13 at 8500 min -1 (DX 1976).
Top speed (  km / h) 125-130
transmission 5/6 gears
drive Chain drive
Brakes first drum brake, later disc brake
Empty weight  (kg) 99–112 (dry)
Previous model Yamaha AS3

The RD 125 was a motorcycle from the Japanese motorcycle manufacturer Yamaha .

Yamaha RD 125 (1973-1978)

In 1973 the manufacturer introduced the designation RD (English for "Race Developed") for its machines. The RD 125 largely corresponded to the Yamaha AS3 / AS2. The RD differed from its predecessors in that it had a drop tank to make the motorcycle slimmer in line with contemporary tastes. The wheelbase grew from 1200 mm to 1240 mm. The air filter was relocated under the side cover and the oil filler neck for the separate lubrication under the seat. The RD had a single-tube frame made of steel ( diamond frame ), open at the bottom, with stereo spring struts at the rear and a telescopic fork at the front. The air-cooled counter-rotating two-stroke parallel twin with a displacement of 125 cm³ was designed as a square, that is, stroke and bore were the same at 43 mm. The motor housing was divided horizontally. The Yamaha RD 125 had a diaphragm control like the AS3 and twin carburettors from Mikuni . Compared to the AS3, the output was slightly increased to 12 kW (17 hp) at 9500 rpm. With 100 kW (136 hp), the liter output of the small machine was high. The RD 125 was also 7 kg heavier than the AS3. It accelerated from 0 to 100 km / h in 13.5 seconds. The motorcycle was started with a kick starter . The RD 125 had duplex at the front and simplex drum brakes at the rear . With the 1976 model year, the front was converted to single-disc brakes .

RD 125 DX (1976–1984)

The main change was the introduction of a disc brake for the entire model range. The models varied in equipment details such as the paintwork. In 1982, with the DX 125 / 1E7, the wire spoke wheels were replaced by cast wheels according to the taste of the time.

RD 125 LC (1982–1987)

In 1982 the RD 125 was reissued. The new model had a liquid-cooled single-cylinder two-stroke engine. Liquid cooling was not very common in this class at the time. The displacement was minimally smaller than that of the predecessor and the engine developed 12 kW (17 hp) at 9000 −1 , in the open version 15 kW (21 hp). The RD 125 LC was particularly popular in countries that had a 125 cm³ Engine size restrictions for motorcycle beginners knew, like Switzerland or England . It looked more modern and sportier than other 125cc machines of its time, and in the unthrottled version it was also ahead of the competition in terms of performance - only a few other 125s could keep up with it, such as the Kawasaki AR 125 or the Suzuki RG 125 Gamma (the latter appeared a few years later). The RD 125 LC / 10W was produced until 1987.

RD 125 LC YPVS (1985–1990)

In some countries from 1985 to 1990 a variant with the YPVS outlet control was sold. The RD 125 LC YPVS (model 1GU) had more pulling power than the normal RD 125 LC (10W) at lower speeds and a slightly higher maximum output - depending on the country up to 16.9 kW (23 PS). In addition, other things such as the cockpit had been modified, and the RD had received a smaller front wheel (16 instead of 18 inches). In countries where the YPVS variant was not sold (such as England due to the 12 HP restriction for novice drivers), these changes were also made to the normal RD 125 LC.

Web links

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Individual evidence

  1. ↑ Our little two-stroke engine. The slightly different side for bikers from bikers. Retrieved May 27, 2017 .
  2. ↑ Yamaha RD 125 (1973–1978) - Riding the cheetah. nippon-classic.de. December 31, 2015, accessed May 27, 2017 .
  3. ↑ Yamaha RD 125 (1973–1978). moto-data.com. Retrieved May 27, 2017 .
  4. ↑ Yamaha Rd 125 LC. .50er-forum.de. Retrieved May 27, 2017 .