| MODEL | YAMAHA TDR 250 1988 |
| Year | 1988 |
| Engine Type | Two stroke, liquid cooled parallel twin, reed valve, YPVS |
| Displacement / Capacity | 249 cc |
| Bore X Stroke | 56.4 x 50 mm |
| Compression Ratio | 5.9:1 |
| Cooling System | Liquid cooled |
| Max Power | 37 kW / 46 hp @ 10000 rpm |
| Max Torque | 3.7 kgf-m / 26.7 lb-ft @ 8500 rpm |
| Ignition | Transistorized |
| Induction | Two 28 mm Mikuni TM28SS flat-slide carburettors |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Autolube oil injection |
| Gear Box | 6 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle, high-tensile steel tube |
| Front Suspension | Air-assisted telescopic forks, 7-way adjustable preload |
| Rear Suspension | Single shock, rising rate, adjustable preload |
| Front Brakes | Single 320 mm disc, 2-piston caliper |
| Rear Brakes | Single 210 mm disc, 1-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 2145 mm / 84.4 in |
| Overall Width | 785 mm / 30.9 in |
| Overall Height | 1215 mm / 47.8 in |
| Seat Height | 820 mm / 32.2 in |
| Wheelbase | 1385 mm / 54.5 in |
| Ground Clearance | 230 mm / 9.0 in |
| Dry Weight | 137 kg / 302 lb |
| Wet Weight | 153 kg / 337 lb |
| WHEEL SPECS | |
| Front Tyre | 110/90-18 |
| Rear Tyre | 120/80-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.6 US gal |
| Fuel Consumption | 15.9 km/l |
| Top Speed | 175 km/h |
The TDR 250 was Yamaha's 'ultimate dual' concept: a liquid-cooled two-stroke parallel twin derived from the TZR 250, in a double-cradle steel frame with dual-purpose tyres and road-bike brakes. It aimed to be nearly as quick on the road as a TZR while handling rough ground like a trail bike. Distinctive touches were the tank-mounted head fairing and tachometer and a cross-over exhaust.
