The Yamaha RX-135 (also popularly known under the name RX-King or RX-K or simply RX in Southeast Asia, especially India & Indonesia) is a two-stroke engine motorcycle produced by Yamaha since the 1990s. The RX-135 was released around the end of the 1990s. In selected India cities, a factory-shipped RX-135 can be bought until August 2009. There were two versions of the bike sold in India — a four-speed version and a five-speed version. The 4-speed produced a power of 12 horsepower and the 5-speed version produced 14 horsepower.