Yamaha RD125 (1979-80)

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The Yamaha RD125 motorcycle was manufactured in 1979 and 1980. The bike is powered by a two-stroke, parallel twin engine, with a capacity of 124cc. The air-cooled engine has a bore x stroke of 43×43 mm and a compression ratio of 6.8:1. The induction system includes two 18mm Teikei carburetors and uses battery coil ignition. The bike is started with a kick. The maximum power output produced is 17 hp / 12.4 kW at 8500 rpm, and the maximum torque is 1.3 kgf-m at 8000 rpm. The five-speed transmission drives the bike using a chain final drive with a gear ratio of (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11. The steel tube frame has an engine used as a stressed member, while a 28 mm telescopic fork and dual rear shocks adjustable for preload provide suspension. The bike has a single 240mm disc brake on the front and a 130mm drum brake on the rear. The front and rear tires are 2.75-18 and 3.00-18, respectively. The wheelbase is 1245 mm / 49.0 in, with a seat height of 749 mm / 29.5 in. The bike weighs 115 kg / 255 lbs, and its fuel capacity is 11.5 Litres / 3.04 US gal.

Technische Daten:

Marke Modell: Yamaha RD 125

Jahr: 1979 - 80


Motor: Zweitakt, Parallel-Twin
Hubraum: 124 cm³ / 7,6 cu-in
Bohrung x Hub: 43 43 mm
Kühlsystem: Luftgekühlt
Verdichtungsverhältnis: 6,8:1
Ansaugung: 2x 18mm Teikei-Vergaser
Zündung: Batterie-Spule
Start: Kick
Max Leistung: 17 PS / 12,4 kW @ 8500 U/min
Max. Drehmoment: 1,3 kgf-m @ 8000 U/min
Getriebe: 5-Gang
Endantrieb: Kette
Übersetzungsverhältnis: (1) 34.52 (2) 19.67 (3) 14.11 (4) 11.34 (5) 9.11
Rahmen: Stahlrohrmotor als tragendes Element
Vorderradaufhängung: 28-mm-Teleskopgabel

Hintere Federung: Doppelter hinterer Stoßdämpfer mit einstellbarer Vorspannung
Vordere Bremsen: Einzel240mm Scheibe
Hintere Bremsen: 130 mm Trommel
Reifen vorne: 2.75-18
Hinterreifen: 3.00-18
Radstand: 1245 mm / 49.0 in
Sitzhöhe: 749 mm / 29.5 in
Nassgewicht: 115 kg / 255 lbs
Kraftstoffkapazität: 11,5 Liter / 3,04 US gal

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