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
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
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.
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
|Also called||TDR 250|
|Production||1988 - 1990|
|Bore / Stroke||56.4mm x 50.0mm|
|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
|Suspension||Front: Air Assisted Telescopic Forks
Rear: Single Shock
|Brakes||Front: single disc
Rear: single disc
|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)|
|Fuel Capacity||3.7 Gallon (14.00 Liters)|
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.
The bike has a 6-speed transmission. Power was moderated via the Wet multi-discs.
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 - 1993 Yamaha TDR 250
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.