Yamaha TDR250 (1990-91)

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.

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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