Yamaha DT1

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Yamaha DT-1
1969 Yamaha DT-1
Manufacturer Yamaha
Also called DT1MX
Production 1968 - 1971
Successor Yamaha DT2
Class Enduro
Engine 246cc Single Cylinder, Air Cooled, Two Stroke
Bore / Stroke 71.1mm x 71.1mm
Compression ratio 6.8:1
Horse Power 21.05 HP (15.7 KW) @ 6000RPM
Torque 2.21 ft/lbs (3.0 Nm) @ 5000RPM
Sparkplug NGK B8ES '71
Transmission Gear box: 5-Speed

Final Drive: Chain

Clutch: Wet multi-discs
Suspension Front: Telescopic fork
Rear: Twin shocks
Brakes Front: Drum
Rear: Drum
Front Tire 3.25-19
Rear Tire 4.00-18
Wheelbase 54.69 inches (1389 mm)
Dimensions L 82.72 inches (2101 mm)
W 35.0 inches (889 mm)
Weight  (dry), 118.0 kg (wet)
Manuals Service Manual
Tech Specs · Brochures · Reviews · Ads · Videos

The Yamaha DT-1 was a Single Cylinder, Air Cooled, Two Stroke Enduro motorcycle produced by Yamaha in 1969. Max torque was 2.21 ft/lbs (3.0 Nm) @ 5000 RPM. Claimed horsepower was 21.05 HP (15.7 KW) @ 6000 RPM.


Engine[edit]

A 71.1mm bore x 71.1mm stroke result in a displacement of just 250.0 cubic centimeters.

Drive[edit]

The bike has a 5-Speed transmission. Power was moderated via the Wet multi-discs.

Chassis[edit]

It came with a 3.25-19 front tire and a 4.00-18 rear tire. Stopping was achieved via Drum in the front and a Drum in the rear. The front suspension was a Telescopic fork while the rear was equipped with a Twin shocks. The wheelbase was 54.69 inches (1389 mm) long.


Yamaha Plays in the Dirt[edit]

In the United States, two types of off-road machine were in use, one for desert racing, the other for enduros in the north-eastern states. The desert sleds, usually twins, demanded brute power and stability from the machines and strength from the rider to control the weight. The enduros called for less weight, quick steering and low-down power, so were much as trials models and used a smaller engine, usually a two-stroke single.

Yamaha saw that there was a major market for a dual-purpose machine, one able to perform well on the road but equally able to run off-road for fun or in competition. Thus came the trail machine, which was able to compete in enduros or simply take its owner up to the hills for the view. Small, light and handy, it could go many places without tiring the rider and Yamaha's first was the DT1 of 1968, powered by a 246cc two-stroke single driving a five-speed gearbox. It was the start of a long, and most successful, off-road line.

The DT-1 made a huge impact on motorcycling in the US because it was truly dirt worthy. Light, simple, inexpensive, and importantly, supremely reliable, the DT-1 sold by the thousands. This machine introduced more people t o off-road and fun riding than any other. For the racer, Yamaha offered a GYT kit (Genuine Yamaha Tuning) that increased engine power to 30 bhp. Individual companies offered a staggering array of accessories, so its rare to find a stock version today. The Enduro put Yamaha On/Off-Road motorcycles on the map in the US.

1968[edit]

1968 Yamaha DT-1
1968 Yamaha DT-1 angled view
1968 Yamaha DT-1 Front view
  • Start Engine#: DT1-00101

1969 Yamaha DT1B[edit]

1969 Yamaha DT-1

The Yamaha DT-1 was a solid, inexpensive bike you could ride to the track and then run with the best purpose-built dirt bikes of the day once you got there. And even if you weren’t a racer, it was a great compromise bike that could handle almost any trail you threw at it — and still get you safely home at the end of the day.

  • Starting Engine#: DT1-15001


1970[edit]

  • Starting Engine#: DT1-50101
  • Starting Engine#: DT1-95101 (DT1CM)

1971 DT1E[edit]

  • Starting Engine#: DT1F-00101/DTF-020101
  • Starting Engine#: DT1F-090101 (DT1MX)

1980[edit]

1980 Yamaha DT1 in Red
1980 Yamaha DT1 in Red
1980 Yamaha DT1 in Red
1980 Yamaha DT1 in Red
1980 Yamaha DT1 in Red
1980 Yamaha DT1 in Red


  • 100cc