page_title: Yamaha TRX850
section_title: Design and development
hierarchical_section_title: Yamaha TRX850 / Design and development
caption_attribution_description: English: Modified TRX850 with Blue-Spot callipers, wavy disks and titanium cans.
context_page_description: The Yamaha TRX850 is a sports motorcycle with a 10-valve DOHC 849 cc 270° parallel-twin engine. First released in Japan in 1995, a version for the European market was available from 1996 to 2000.
context_section_description: The TRX has a half fairing, clip-on handlebars and mildly rear-set footrests. The front forks are conventional telescopics, and the rear suspension is a rising-rate monoshock unit.  Effectively a factory-built café racer, there is meagre provision for a pillion passenger.
  The TRX engine was derived from that in the Yamaha TDM850, but the TRX is lighter, lower and sportier than its TDM stablemate. The parallel twin engine has five valves per cylinder, three inlet and two exhaust. The engine produces some 85 Nm of torque and 79 bhp. Unusually for a  dry sump design, the oil tank is not remote, but is integral to the engine, sitting atop the gearbox. This feature simplifies manufacture, eradicates external oil lines, and gives faster oil warm-up.  The shallow sump allows the engine to be sited lower, for an optimal CG position. The 360° crank of the original TDM was changed to a 270° crank in 1996, after which time the TRX and the TDM shared the same engine and transmission.  The engine has a balance shaft to smooth out residual vibrations. 
  In 2000 Yamaha stopped making the TRX, while the TDM series, enlarged to 900 cc, remained in production until 2011.
caption: TRX with modifications: wavy brake discs, Blue-Spot callipers & Blue-Ray titanium cans
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