Yamaha TDR 250 information

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Yamaha TDR250

Manufacturer	Yamaha Motor Company
Also called	Ultimate Dual
Production	1988 - 1993
Class	Dual Sport
Engine	249cc two-Stroke parallel twin YPVS
Transmission	6-speed constant mesh manual, chain final drive
Wheelbase	1,385 mm (54.5 in)
Dimensions	L: 2,145 mm (84.4 in) W: 785 mm (30.9 in)
Seat height	820 mm (32.3 in)
Weight	137 kg (302 lb) (dry)
Fuel capacity	14.0 L (4 US gal; 3 imp gal)
Related	Yamaha R1-Z, Yamaha TZR250

The Yamaha TDR250 was a street-legal middleweight dual-sport bike produced by Japanese motorcycle manufacturer Yamaha between 1988 and 1993.

It was powered by the naturally-aspirated, crankcase reed-valve inducted, liquid-cooled 249cc parallel-twin two-stroke engine from the first generation TZR250 (this same engine also powered the R1-Z). This engine featured the 'YPVS' Yamaha Power Valve System, CDI ignition and digital spark advance [1]. Almost all of the engine, gearbox, and electrical components are interchangeable with the TZR and R1-Z.

The TDR was designed to provide agile handling and quick acceleration both on and off the road, and power delivery was modified to suit its intended use [2]. The special upswept expansion chambers, unique to the TDR, part of this; as well as aiding ground clearance. The bike was originally released in a 250cc format, but a 240cc derivative was also produced exclusively for the French market.^[1]