Another bike that was performance-oriented was the Yamaha RX-Z, introduced in 1985 as a two-stroke naked sport bike, related to the Yamaha RX-135 and Yamaha RD-135, borrowing its chassis and platform. Originally equipped with a five speed transmission and a solid front disc brake rotor with rear drum brakes, it was popular in Malaysia and Singapore. After a few years on the market, the engine was upgraded with the installation of a six-speed transmission, together with a newer instrument panel and handlebar switches, as well as a cross-drilled front disc brake rotor, while the rear remained with the drum brakes. The design was unchanged until it was updated in 2004, with the rear lights being borrowed by the Yamaha Y125Z and a new headlight. It was also installed with a catalytic converter, which reduced its horsepower to 19bhp. However, the maximum torque remained unchanged but the low-end torque was improved compared to 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 new model. In Malaysia, this bike was associated with street racers and was featured in many Malay movies. In 2011, after 26 years, it was discontinued.