Engineering:Yamaha TDR 250
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| 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.
Specifications of TDR 250
| Engine Type | Parallel Twin Cylinder, Water Cooled, Two-Stroke, YPVS |
|---|---|
| Carburetion | Mikuni TM28SS x 2 |
| Displacement | 249 cc [239 cc] |
| Bore × Stroke | 56.4 x 50.0 mm [55.2 x 50.0 mm] |
| Peak Power | 50.3 PS (37.1 kW) @ 10,000 rpm [44.3 PS (32.6 kW) @ 10,000 rpm] |
| Peak Torque | 3.7 kg-m (36.2 Nm) @8,500 rpm [3.5 kg-m (34.6 Nm) @9,500 rpm] |
| Compression Ratio | 5.9:1 [5.7:11] |
| Fuel Capacity | 14.0 L (4 US gal; 3 imp gal) |
| Oil Capacity | 1.4 L (0.4 US gal; 0.3 imp gal) |
| Seat Height | 820 mm (32.3 in) |
| Dry Weight | 137 kg (302 lb) |
| Tires | Front 100/90-18H Rear 120/80-17H |
| Brakes | Front Hydraulic disc, with 320 mm (12.6 in) floating disc and 4-pot opposed-piston caliper. Rear Hydraulic disc, with 210 mm (8.3 in) disc and opposed-piston caliper |
| Final drive | Chain |
Note: []= French Model
External links
- [Yamaha Global - https://global.yamaha-motor.com/]
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