Yamaha RX-Z

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Yamaha RX-Z 135
2004 Yamaha RX-Z with catalytic converter.
PredecessorYamaha RD125
SuccessorYamaha FZ150i
ClassNaked bike
Engine135 cc 2-stroke
Power20 PS @ 8,500 rpm
Transmission6-speed return
SuspensionFront: Telescopic fork
Rear: Dual shocks swingarm
BrakesFront: Disc
Rear: Drum
Weight106 kg
Fuel capacity13.0 l
RelatedYamaha RX-135
Yamaha Y125Z

Yamaha RX-Z 135 is a 2-stroke naked bike manufactured by Yamaha Motor Corporation. Debuted in 1987, the RX-Z is very popular in Malaysia and Singapore and enjoys one of the longest current motorcycle product life in both countries, especially in Malaysia due to the absence of other street bike competitors to date. In 2004, the model was facelifted and a catalytic converter was installed.


  • Engine: 2-stroke 135cc air-cooled engine
  • Cylinder arrangement: 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: 160 km/h
  • Bore x stroke: 56.0 x 54.0 mm
  • Compression ratio: 7 : 1
  • Transmission: 6-speed return
  • Clutch: Multiple-disc, wet manual
  • 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: 13.0 L


Debuted in 1987, the Yamaha RX-Z was originally equipped with a 5-speed transmission with solid front disc brake. The model shared the same platform and chassis as its predecessor, the water-cooled Yamaha RD125. Shortly after the launch, the RX-Z became popular among young motorcyclists especially in Malaysia. A few years later, the engine was upgraded with the installation of a 6-speed transmission, together with newer instrument panel and handlebar switches, as well as a 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 Y125Z. The facelifted RX-Z was equipped with a catalytic converter, sacrificing 1 PS of maximum power (original maximum power: 21 PS). However, the maximum torque remained unchanged but the low-end torque was improved compared with the early models. 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 the first gear. However, the problem was resolved in the facelifted model.

In Malaysia, the RX-Z is one of the motorcycle models often associated with Mat Rempit street racers. As a result, many Malay movies including Remp-It use the RX-Z in their movies.

See also

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