Yamaha DT

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The Yamaha DT is a series of Bikes produced by the Yamaha. Models in the DT series feature an Engine of 50 to 400 cc (3.1 to 24.4 cu in). The first DT model, the DT-1, was released in 1968 and quickly sold through its initial 12,000 production run.

The DT series was created by Yamaha in the late 1960s when the United States motorcycle market was down. Market research by Yamaha indicated that, despite slow motorcycle sales, there was a largely untapped market for off-road motorcycles. At the time, only a few specialty European manufacturers such as BUltaco and Husqvrana made motorcycles specifically for off-road use. Instead, many owners purchased road motorcycles and modified them for off-road use, typically by raising the muffler , adding braced handlebars, and fitting a bash plate under the engine . Such modifications were commonly known as creating scramblers. The first DT model, the DT-1 trail bike, was released in 1968 and quickly sold out.

DT-1

With the introduction of the DT-1, Yamaha essentially defined a new market for motorcycles. A Dual-Sprot bike built for off-road riding, the light and slim DT-1 was equipped with block-pattern tires and had sufficient ground clearance. Its design put it at the cutting edge of off-road bikes at that time. It had a 250 cc, single-cylinder, 5-port engine based on a motocross design, and Cerini-type front suspension.

68-69 DT1 Specifications

Model

DT1 – DT1B

dt1

Year

1968-69

Frame/Engine Prefix   (XXX-000101)

DT1

Bore (mm)

70

Stroke (mm)

64

Capacity (cc)

246

Compression Ratio (to 1)

6.8

Bhp @ rpm

21bhp @ 6,000rpm (30 @ 7,000)

Model Notes

Torque (kgm) @ rpm

25nm @ 5,000

(31nm @ 6,5001)

Oil System

Autolube

Engine Cooling

Air

Carburetor (mm)

VM26SH (VM30SH1)

Ignition System

Magneto

Ignition Timing (mm)

3.2 (2.3)

Primary drive gearing

3.095

Final Drive Gearing

44/15 (44/141)

Box Gearing first

2.23

Box Gearing second

1.62

Box Gearing third

1.21

Box Gearing fourth

1.0

Box Gearing fifth

0.82

Box Gearing sixth

Fuel Cap. (liters)

9

Engine Oil Cap. (liters)

1.6

Gearbox Oil Cap. (Liters)

1.0

Fork Oil Ca. (cc/leg)

210

Front Tire (stock)

3.25 x 19

Rear Tire (stock)

4.00 x 18

Front Brake

drum

Rear Brake

Drum

Rear Suspension

Twin shock

Front Susp. Travel (mm)
Rear Susp. Travel (mm)
Rake (degrees)
Trail (mm)
Width (mm)
Ground Clearance (mm)

240

Wheelbase (mm)

1366

Dry Weight (kg)

105

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