Welcome to the 1969 Yamaha DT1-S / DT1-SA Forum. USA DT1S Model Code 264 & model code 270 for the Australian DT1SA. Feel free to post anything related to this model in the category. Anything new, will be added to this section. The Factory color for the DT1S was: Candy Orange. The USA Vin number range for the DT1S was: DT1-90101 to 91573. If you see any errors, please contact me privately.

                      1969 Yamaha DT1S Specifications

            Model 1969 Yamaha DT1S

   Dimensions:

Overall Length 81.1 In. / 2,060MM

Overall Width 35.0 In. / 890MM

Overall Height 44.5 In. / 1,130MM

Wheelbase 53.6 In. / 1,360MM

Min. Ground Clearance 9.6 In. / 245MM

    Weight:

Gross 256 Lbs. / 120Kg

Net 232 Lbs. / 109Kg

   Performance:

Max, Speed 70 MPH / 112Km/h +

Fuel Consumption 94 MPG @ 25 MPH / 40Km @ 40Km/h

(On paved level roads)

Climbing Ability 37 Degree

Min. Turning Radius 82.6 In. / 2,100MM

Braking Distance 40 Ft. @ 30 MPH (12.5M @ 50Km/h)

   Engine:

Model DT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 15 cu. in. (246cc)

Bore X Stroke 2.77 X 2.52 In. (70MM X 64MM)

Compression Ratio 6.8:1

Max Power 21 BHP/7,000 RPM

Max Torque 16.8 Ft.-Lbs @ 5,000 RPM                        

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

Starting System Primary-Coupled Kick

Ignition Timing B.T.D.C 3.2 MM +/- .011 - 0.13 MM

NGK Spark Plug & Gap B-7E (N) 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 (Microfarad)

   Carburetor:

Type VM26SH

Main Jet # 160

Jet Needle 5D1 - 3

Air Jet 0.5

Needle Jet 0 - 2

Cut Away 2.5

Pilot Jet (#) 35

Air Screw (turns out) 1 1/2

Starter Jet (#) 60

Float Level 14.1MM

  Intake:

Air Cleaner Wet, Foam Rubber

   Transmission:

Clutch Wet, Multiple Disk

Primary reduction system Helical Gear

Primary reduction ratio 3.095 / (65/21) Teeth

Trans Oil Capacity 1.06 Qts / 1,000cc

   Gear Box:

Type Constant Mesh, 5 Speed Forward

1st Gear teeth & Ratio 2.533 (38/15)

2nd Gear teeth & Ratio 1.789 (34/19)

3rd Gear teeth & Ratio 1.304 (30/23)

4th Gear teeth & Ratio 1.000 (26/26)

5th Gear teeth & Ratio 0.767 (23/30)

Secondary reduction system Chain

Secondary reduction ratio 3.143 (44/14)

  Chassis:

Frame Tubular-Double Loop

Front Suspension System Front Telescopic fork

Rear Suspension System Swinging Arm

Fork Oil Capacity 210cc (7.1 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 137MM

  Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

  Tire Size:

Front 2.75 - 21 - 4PR Trials Universal

Rear 4.0 - 18 - 4PR Trials Universal

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 FZA - 1BL

Manufacturer Mitsubishi Elec.

  Battery:

Model MV1-6

Manufacturer Nippon Battery

Capacity 6V 2AH

  Lighting:

Head Light 6V 35W/35W

Tail Light 6V 5.5W

Stop Light 6V 17W

Meter Light 6V 3W X 2

High Beam Indicator Light 6V 1.5W

  Tanks:

Gasoline Tank Capacity 2.5 Gallons

Oil Tank Capacity 1.7 Quarts

  Chain:

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

The 1969 Yamaha DT1S Rider's Manual is Located: CLICK HERE

The 1968-1971 Yamaha DT1 Combined Service Manual is Located: CLICK HERE

The USA 1969 Yamaha DT1-S Parts Manual is Located: CLICK HERE

The Australia 1969 Yamaha DT1-SA Parts Manual is Located: CLICK HERE

The Canada Yamaha DT1S parts Manual Supplement is located: CLICK HERE

The 1969-1971 Yamaha Autolube adjustment and Color Codes are Located: CLICK HERE

The Australia 1969 Yamaha DT1-SA Article is Located: CLICK HERE

The Australia DT1SA price list is located: CLICK HERE

The 1969 Yamaha DT1-S Parts Page is Located: CLICK HERE