The Yamaha RX115 and Yamaha RX-S (commonly known as the Yamaha RX-Special in Indonesia) are a series of 115cc two-stroke, single-cylinder motorcycles manufactured by Yamaha Motor Company from the early 1980s. Developed during an era when motorcycle design shifted toward modern, angular aesthetics, these models offered high power-to-weight ratios and served as lighter alternatives to standard commuter options across global and Southeast Asian markets.
Overview and Design
Introduced to update Yamaha's light-displacement lineup, the series featured distinct 1980s styling cues such as a rectangular fuel tank, a square headlight assembly, and sharp body lines. The engineering platform heavily influenced several regional derivatives throughout Asia. For instance, a scaled-down version served as the mechanical foundation for the popular 98cc Yamaha RX100 in India. In various markets, these 115cc models operated alongside larger two-stroke stablemates, such as the Yamaha RX-King 135 in Indonesia and the Yamaha RX-Z 135 in Malaysia.
Market Variations
While sharing the same fundamental engine block design, the motorcycles were adapted to meet different regional market regulations:
- Yamaha RX115: Primarily marketed in regions like Latin America and South Asia, this variant generally utilized a 5-speed manual transmission geared for higher top-end performance.
- Yamaha RX-S / RX-Special: Popularized in Southeast Asian markets, this iteration was fitted with a 4-speed transmission and integrated the Yamaha Energy Induction System (YEIS) to optimize lower-end power delivery for urban commuting.
Technical Specifications
| Attribute | Specification |
|---|---|
| Engine | 115 cc air-cooled, 2-stroke, reed-valve single-cylinder |
| Bore / Stroke | 54.0 mm × 50.0 mm |
| Transmission | 4-speed or 5-speed manual (market dependent) |
| Fuel System | Carburetor |
| Lubrication | Separate 2T oil injection (Yamaha Autolube) |