Yamaha DT1

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Yamaha DT-1
Also called DT1MX
Production 1968 - 1971
Class Enduro
Successor Yamaha DT2
246cc Single Cylinder, Air Cooled, Two Stroke
Bore / Stroke 71.1mm x 71.1mm
Compression ratio 6.8:1
Horsepower 21.05 HP (15.7 KW) @ 6000RPM
Torque 2.21 ft/lbs (3.0 Nm) @ 5000RPM
Spark Plug NGK B8ES '71
Battery YUASA 6N4-2A-3 `68-71[1]
Transmission Gear box: 5-Speed

Final Drive: Chain

Clutch: Wet multi-discs
Final Drive Chain: 520 `68-71[1]
Front Sprocket 14T ‘70[1]
Rear Sprocket 44T ‘70[1]
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)
Length 82.72 inches (2101 mm)
Width 35.0 inches (889 mm)
Weight 118.0 kg (wet)
Recommended Oil Yamalube 10w-40
Related Yamaha RT1
Value $4,100
Manuals Service Manual

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 | edit source]

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

Drive[edit | edit source]

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

Chassis[edit | edit source]

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 | edit source]

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 | edit source]

  • Start Engine#: DT1-00101

1969 Yamaha DT1B[edit | edit source]

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 | edit source]

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

1971 DT1E[edit | edit source]

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

1980[edit | edit source]

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

References[edit | edit source]

  1. 1.0 1.1 1.2 1.3 2019 Western Power Sports Catalog. Western Power Sports. 2019.