Yamaha TDR250

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Yamaha TDR250
Also called TDR 250
Production 1988 - 1990
Class Enduro
twin, two-stroke
Bore / Stroke 56.4mm x 50.0mm
Compression ratio 5.9:1
Top Speed 100 mph (161 km/h)
Horsepower 48.95 HP (36.5 KW) @ 10000RPM
Torque 26.55 ft/lbs (36.0 Nm) @ 8500RPM
Transmission Gear box: 6-speed

Final Drive: chain

Clutch: Wet multi-discs
Suspension Front: Air Assisted Telescopic Forks
Rear: Single Shock
Brakes Front: single disc
Rear: single disc
Front Tire 100/90-18
Rear Tire 120/80-17
Wheelbase 54.49 inches (1384 mm)
Length 84.41 inches (2144 mm)
Width 30.91 inches (785 mm)
Seat Height 32.28 inches (820 mm)
Weight 153.0 kg (wet)
Recommended Oil Yamalube 10w-40
Fuel Capacity 3.7 Gallon (14.00 Liters)
Related Yamaha TZ250
Yamaha TZR250
Value $7000
Manuals Service Manual

The Yamaha TDR250 was a twin, two-stroke Enduro motorcycle produced by Yamaha between 1988 and 1990. It could reach a top speed of 100 mph (161 km/h). Max torque was 26.55 ft/lbs (36.0 Nm) @ 8500 RPM. Claimed horsepower was 48.95 HP (36.5 KW) @ 10000 RPM.

Overview[edit | edit source]

In the beginning were the trail bikes, civilized off-road motorcycles that were as usable on the highway as in the rough. From that starting point, it was only a short step to the creation of multi-purpose machines with the power of sportbikes.

A Special Hybrid[edit | edit source]

It began with the creation of a wild racing formula. The machines were run over mixed courses that were half dirt trail/half blacktop. On the course, the best riders from three disciplines - motocross, enduro and speed events,confronted one another. For this type of event, very special hybrid motorcycles were evolved, taking their basic concept from motocross and their road equipment from clubman racing: wide-section tires, close fitting front mudguard, large diameter disk brakes and relatively short-travel suspension. Aggressive and endowed with diabolical handling, these racing machines quickly inspired modification kits for trail bikes.

Overdose of Caution[edit | edit source]

That was all it took to start a fashion and Yamaha, unveiled in 1987 the TDR. It was a novel experiment in combining all the traits of a dual-sport machine with a two-stroke. The idea was a good one but the Japanese factory was too cautious in limiting itself to a capacity of 250cc, trying to satisfy at the same time its domestic market for under 250cc machines and the strange requests coming from abroad. The TDR was widely applauded for its concept but failed to become a bestseller because of its engine, which lacked torque.

Engine[edit | edit source]

The engine was a liquid cooled twin, two-stroke. A 56.4mm bore x 50.0mm stroke result in a displacement of just 250.0 cubic centimeters. Fuel was supplied via a membrane & power valve.

Drive[edit | edit source]

The bike has a 6-speed transmission. Power was moderated via the Wet multi-discs.

Chassis[edit | edit source]

It came with a 100/90-18 front tire and a 120/80-17 rear tire. Stopping was achieved via single disc in the front and a single disc in the rear. The front suspension was a Air Assisted Telescopic Forks while the rear was equipped with a Single Shock. The TDR250 was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The wheelbase was 54.49 inches (1384 mm) long.

1988[edit | edit source]

1989[edit | edit source]

1990[edit | edit source]

I don't believe this bike was offered in the US. However it was offered in Canada. The engine in this bike is a TZ250 engine rated at 50hp.

  • twin-cylinder 2 stroke

1988 - 1993 Yamaha TDR 250[edit | edit source]

With the heart of the TZR 250, Yamaha TDR 250 was manufactured from 1988 to 1993, being powered by a two stroke parallel twin engine. It was the first two stroke machine which used a CDI ignition and a digital advance system.

In Media[edit | edit source]