The Yamaha TDR 250 was a two-stroke, parallel twin cylinder motorcycle with a 249 cc capacity and a compression ratio of 5.9:1. Its autolube lubrication system was fed by 2x 28mm TM28SS Mikuni carburetors, and it had a transistorized ignition and kick start. The bike had a maximum power output of 46 hp at 10000 rpm and a maximum torque of 3.7 kgf-m at 8500 rpm. The TDR 250 had a six-speed transmission and chain final drive, with air-assisted telescopic forks and a single shock rising rate adjustable preload on the front and rear suspension, respectively. The front and rear brakes were single-disc, with 2 piston calipers on the front and a single piston caliper on the rear. The bike had a seat height of 820 mm, a ground clearance of 230 mm, and weighed 137 kg dry and 153 kg wet, with a 14-liter fuel capacity. The TDR 250 had a top speed of 175 km/h and could accelerate from standing to 1/4 mile in 13.6 seconds at a speed of 152.8 km/h.
Technical specifications:
Make Model: Yamaha TDR 250
| Year | 1990 – 91 |
|---|---|
| Engine | Two stroke, parallel twin cylinder, read valve, YPVS |
| Capacity | 249 cc / 15.2 cu-in |
| Bore x Stroke | 56.4 50 mm |
| Cooling System | Liquid cooled |
| Compression Ratio | 5.9:1 |
| Lubrication | Autolube |
| Induction | 2x 28mm TM28SS Mikuni carburetors |
| Ignition | Transistorized |
| Starting | Kick |
| Max Power | 46 hp / 37 kW @ 10000 rpm |
| Max Torque | 3.7 kgf-m / 26.7 lb-ft @ 8500 rpm |
| Transmission | 6 Speed |
| Final Drive | Chain |
| Front Suspension | Air assisted telescopic forks 7-way adjustable preload |
| Rear Suspension | Single shock rising rate adjustable preload |
| Front Brakes | Single 320mm disc 2 piston calipers |
| Rear Brakes | Single 210mm disc single piston caliper |
| Front Tyre | 110/90-18 |
| Rear Tyre | 120/80-17 |
| Dimensions | Length 2145 mm / 84.4 in Width 785 mm / 30.9 in Height 1215 mm / 47.8 in |
| Wheelbase | 1385 mm / 54.5 in |
| Seat Height | 820 mm / 32.2 in |
| Ground Clearance | 230 mm / 9.0 in |
| Dry Weight | 137 kg / 302 lbs |
| Wet Weight | 153 kg / 337 lbs |
| Fuel Capacity | 14 Litres / 3.6 US gal |
| Consumption Average | 15.9 lm/lit |
| Braking 60 – 0 / 100 – 0 | 14.0 m / 38.7 m |
| Standing 1/4 Mile | 13.6 sec / 152.8 km/h |
| Top Speed | 175 km/h |
