Yamaha TZR250

The Yamaha TZR250 is a sport-oriented, fully faired two-stroke motorcycle that Yamaha built from 1986 to 1995. It was shown publicly in autumn 1985, loosely based on the TZ250 racing machine, and replaced the popular RD250 and RD350LC series of the 1980s with a more modern design and chassis, including an aluminium alloy frame and swingarm and the Yamaha Power Valve System (YPVS), which varies the effective exhaust port height with engine speed. In standard form the engine produced 45 hp because of restrictions in the exhaust and ignition boxes. Over its run the engine layout moved from the original parallel twin through reverse cylinder models to 90 degree V-twin versions. Production began in June 1986 at an introductory price of 549,000 yen in Japan; the parallel twin 2MA was the export model for the UK, Europe, Oceania and Canada, while the 1KT was the domestic Japanese version.