Welcome to the 1969 Yamaha AT1-M Forum. The factory color was called "Pearl White". The USA Vin Range is: AT1-300101 to 303790. Feel free to post anything related to this model in the category. Anything new, will be added to this section. If you see any errors, please contact me privately.

(Penny Bridges...honored to her memory)

                     1969 Yamaha AT1-M Specifications

            Model 1969 Yamaha AT1M

   Dimensions:

Overall Length 76.4 In.

Overall Width 35.8 In.

Overall Height 43.1 In.

Wheelbase 50.8 In.

Min. Ground Clearance 9.1 In.

    Weight:

Gross 218 Lbs.

Net 202 Lbs.

   Performance:

Max, Speed 60 MPH +

Fuel Consumption 114 MPG @ 25 MPH

(On paved level roads)

Climbing Ability 30 Degree

Min. Turning Radius 74.8 In.

Braking Distance 58.3 Ft. @ 31 MPH

   Engine:

Model AT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 7.5 cu. in. (123cc)

Bore X Stroke 2.205 X 1.969 In. (56 X 50MM)

Compression Ratio 8.0:1

Max Power 18 BHP/8,500 RPM

Max Torque 11.4 Ft.-Lbs/7,500 RPM                               

Piston Skirt Clearance .0016 - .0018 In. / 0.40 - 0.45MM                                         

Starting System Primary-Coupled Kick

Ignition Timing B.T.D.C 2MM +/- .1MM

NGK Spark Plug & Gap B-9E 0.5-0.6 MM

Contact Break Point Gap 0.011 - 0.013 Inch / 0.30 - 0.35 MM

Volt Reg. Adjustment -

(Volts @ RPM - No load)

Cutout Relay Adjustment -

Condenser Capacity .22UF

   Carburetor:

Type VM26SH

Main Jet # 170

Jet Needle 4D3-3

Air Jet -

Needle Jet 0 - 2

Cut Away 1.5

Pilot Jet # 30

Air Screw (turns out) 1 1/2

Starter Jet # 40

Float Level 25.5MM

  Intake:

Air Cleaner Wet, Foam Rubber

   Transmission:

Clutch Wet, Multiple Disk

Primary reduction system Helical Gear

Primary reduction ratio 3.895 / (74/19) Teeth

Trans Oil Capacity .78 Qts

   Gear Box:

Type Constant Mesh, 5 Speed Forward

1st Gear teeth & Ratio 2.833 (34/12) 33.09

2nd Gear teeth & Ratio 1.875 (30/16) 21.09

3rd Gear teeth & Ratio 1.368 (26/19) 15.98

4th Gear teeth & Ratio 1.090 (24/22) 12.73

5th Gear teeth & Ratio 0.956 (22/23) 11.17

Secondary reduction system Chain

Secondary reduction ratio 3.000 (45/15)

  Chassis:

Frame Tubular-Double Loop

Front Suspension System Front Telescopic fork

Rear Suspension System Swinging Arm

Fork Oil Capacity 160cc (5.4 Oz.)

Front Cushion System Coil Spring / Oil Damper

Rear Cushion System Coil Spring / Oil Damper

  Steering System:

Steering Angle 49 Degrees both left & right

Caster 60.5 Degrees

Trail 4.84 In. / 123MM

  Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

  Tire Size:

Front 3.25 - 18 - 4PR Knobby

Rear 3.50 - 18 - 4PR Knobby

Front Tire Pressure 14 P.S.I

Rear Tire Pressure 17 P.S.I

  Oil Pump:

Adjustment Stroke Min 0.20 - 0.25 MM

Adjustment Stroke Max 1.85 - 2.05 MM

  Dynamo:

Model F130

Manufacturer Hitachi Ltd.

  Battery:

Model -

Manufacturer -

Capacity -

  Lighting:

Head Light -

Tail Light -

Stop Light -

Meter Light -

High Beam Indicator Light -

  Tanks:

Gasoline Tank Capacity 1.9 Gallons

Oil Tank Capacity 1.3 Quarts

  Chain:

Tension (Up & down free play) 20MM (25/32)

The 1969 AT1/AT1M Rider's Manual is Located: CLICK HERE

The 1969 - 1971 Yamaha AT1/CT1 Combined Service Manual is Located: CLICK HERE

The 1969 - 1971 Yamaha AT1/CT1 Parts Manual is Located: CLICK HERE

The 1969 Yamaha AT1 & AT1M Service Manual is located: CLICK HERE

The 1969 Yamaha AT1-E / AT1M Cycle World Article is Located: CLICK HERE

1969-1971 Yamaha Auto Lube Adjustment & Color Codes is Located: CLICK HERE

The 1969 Yamaha Dealership Pocket Book is Located: CLICK HERE

The 1969 Yamaha AT1-M Parts Store is Located: CLICK HERE