Yamaha TDR 250
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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]
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 |
| 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 | Script error: No such module "convert". |
| Oil Capacity | Script error: No such module "convert". |
| Seat Height | Script error: No such module "convert". |
| Dry Weight | Script error: No such module "convert". |
| Tires | Front 100/90-18H
Rear 120/80-17H |
| Brakes | Front Hydraulic disc, with Script error: No such module "convert". floating disc and 4-pot opposed-piston caliper. Rear Hydraulic disc, with Script error: No such module "convert". disc and opposed-piston caliper |
| Final drive | Chain |
Note: [ ]= French Model
References
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External links
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