Yamaha TDR 250

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

Yamaha TDR250
ManufacturerYamaha Motor Company
Also calledUltimate Dual
Production1988 - 1993
ClassDual Sport
Engine249cc two-Stroke parallel twin YPVS
Transmission6-speed constant mesh manual, chain final drive
Wheelbase1,385 mm (54.5 in)
DimensionsL: 2,145 mm (84.4 in)
W: 785 mm (30.9 in)
Seat height820 mm (32.3 in)
Weight137 kg (302 lb) (dry)
Fuel capacity14.0 L (4 US gal; 3 imp gal)
RelatedYamaha R1-Z, Yamaha TZR250

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.

Specifications of TDR 250
Specifications for 1988 - 1993 model
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

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