Welcome to the 1970 Yamaha DT1-C Forum. The Factory paint color was called Brilliant Red. The USA Vin Number Range is: DT1-50101 to 66389. 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.

                    1970 Yamaha DT1-C Specifications

            Model 1970 Yamaha DT1C

   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 35 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 23 BHP/7,000 RPM

Max Torque 17.5 Ft.-Lbs @ 6,500 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 15.1MM

  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) (24.644)

2nd Gear teeth & Ratio 1.789 (34/19) (17.408)

3rd Gear teeth & Ratio 1.304 (30/23) (12.689)

4th Gear teeth & Ratio 1.000 (26/26) (9.728)

5th Gear teeth & Ratio 0.826 (23/30) (7.458)

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 5.12 In. / 130MM

  Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

  Tire Size:

Front 3.25 - 19 - 4PR Trials Universal

Rear 4.00 - 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 1970 Yamaha DT1-C Rider's Manual is Located: CLICK HERE

The 1970 Yamaha DT1C Service Manual is Located: CLICK HERE

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

The 1970 Yamaha DT1C Parts Manual Supplement is Located: CLICK HERE

The primary DT1 Parts Manual is located: CLICK HERE

The Canada 1970 Yamaha DT1C parts manual is located: CLICK HERE

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

The 1970 Yamaha DT1-C Article # 1 is Located: CLICK HERE

The 1970 Yamaha DT1-C Advertisement # 1 is Located: CLICK HERE

The 1970 Yamaha Full Line Up Brochure is Located: CLICK HERE

The 1970 Yamaha Enduro Full Line Up Brochure is Located: CLICK HERE

The USA 1970 Yamaha DT1-C Brochure is Located: CLICK HERE

The 1970 Yamaha DT1-C Crankshaft Data is Located: CLICK HERE

The 1970 Cycle Buyers Guide is Located: CLICK HERE

The 1970 Motorcycle & Trail Biking handbook is located: CLICK HERE

The Hobby Lobby Metal Tin Sign is Located: CLICK HERE

The 1970 Yamaha DT1-C Parts Store is Located: CLICK HERE