Yamaha TDR 250
| 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 . 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 . 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.