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.
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 Oil Capacity Seat Height Dry Weight Tires Front 100/90-18H Rear 120/80-17H Brakes Front Hydraulic disc, with floating disc and 4-pot opposed-piston caliper. Rear Hydraulic disc, with disc and opposed-piston caliper Final drive Chain
Note: [ ]= French Model
References
External links Yamaha Global