Debuted in 1987, the Yamaha RX-Z was originally equipped with a 5-speed transmission with solid front disc brakes. These models share the same platform and chassis as its predecessor, the water-cooled Yamaha RD125. Shortly after launch, the RX-Z became popular among young motorcyclists especially in Malaysia. A few years later, the engine is enhanced with the installation of a 6-speed transmission, together with newer instrument panel and handlebar switches, and cross-drilled front disc brake rotor.
Since then, the design of the RX-Z remained unchanged until 2004 when the model was facelifted, with the rear lights borrowed from the Yamaha Y125 Z. The face lifted RX-Z is equipped with a catalytic converter, sacrificing 1 PS of maximum power (original maximum power: 21 PS). However, the maximum torque remains unchanged but the low-end torque is improved compared with the initial model. Some owners of the earlier RX-Z motorcycles may have problems during take-off because the engine tends to stall when an inexperienced rider tries to take off in first gear. However, the problem was resolved in a face lifted models.
▪ Engine: 135cc 2-stroke air-cooled engine
▪ Setting Cylinder: Forward-inclined single cylinder
▪ Displacement: 133 cc
▪ Max power: 20 PS (15 kW) @ 8,500 rpm
▪ Max torque: 1.85 kgf · m (18.1 N · m) @ 7,500 rpm
▪ Max speed: 165 km / h
▪ Bore x stroke: 56.0 x 54.0 mm
▪ Compression ratio: 7: 1
▪ Carburetion: Mikuni VM26
▪ Transmission: 6-speed return
▪ Clutch: Multi-disc, manual wet
▪ Frame Type: Underbone steel tube
▪ Suspension (Front): Telescopic
▪ Suspension (Rear): Dual shock
▪ Brake (Front): Single-piston disc
▪ Brake (Rear): Drum
▪ Dry weight: 106 kg
▪ Fuel tank capacity: 13.0L
