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69-71 AT1 125 Specifications

Model

AT1

 

Year

1969-1971

 Yamaha-125-AT1-1971

Frame/Engine Prefix   (XXX-000101)

AT1

Bore (mm)

56

Stroke (mm)

50

Capacity (cc)

123

Compression Ratio (to 1)

7.1

Bhp @ rpm

11.5 @ 7,500

Model Notes

Torque (kgm) @ rpm

1.17 @ 6,000

These bikes are 12 volt, electric start and MUST have a fully charged battery to run. They use a different style of ignition than the other bikes.

Pictures only show one year on multi-year bikes. Check VIN tables for colors for your specific year.

Oil System

Autolube

Engine Cooling

Air

Carburetor (mm)

VM24SH

Ignition System

Starter/Dynamo

Ignition Timing (mm)

1.8

Primary drive gearing

3.9

Final Drive Gearing

45/14

Box Gearing first

3.18

Box Gearing second

2.0

Box Gearing third

1.37

Box Gearing fourth

1.0

Box Gearing fifth

0.8

Box Gearing sixth

-

Fuel Cap. (liters)

7

Engine Oil Cap. (liters)

1.23

Gearbox Oil Cap. (Liters)

0.74 (0.76[1])

Fork Oil Ca. (cc/leg)

160 (150[2])

Front Tire (stock)

3.00 x 18

Rear Tire (stock)

3.25 x 18

Front Brake

Drum

Rear Brake

Drum

Rear Suspension

Twin shock

Front Susp. Travel (mm)

145

Rear Susp. Travel (mm)

110

Rake (degrees)

29.5

Trail (mm)

 

Width (mm)

909

Ground Clearance (mm)

225

Wheelbase (mm)

1,285

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Dry Weight (kg)

94 (992)  (101)

   
   

[1]  = AT1C

[2]  = AT1B

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