1971 Yamaha Enduro DT1E 250 Page

Welcome to the 1971 Yamaha DT1-E Forum. Feel free to post anything related to this model in the category. The Yamaha factory color was called "Mandarin Orange". The USA vin range was: DT1F-20101 to 45120. The vin range of the close ratio transmission model was: DT1F-00101 to 03492. Anything new, will be added to this section. If you see any errors, please contact me privately. There were many errors, in the early Yamaha literature. I will make some error's of my own.

                    1971 Yamaha DT1-E Specifications

            Model 1971 Yamaha DT1E

   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 269 Lbs.

Net 245 Lbs.

   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 6.4:1

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 +/- .012 - 0.15 MM

NGK Spark Plug & Gap B-ES & 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) (17.41)

3rd Gear teeth & Ratio 1.304 (30/23) (12.69)

4th Gear teeth & Ratio 1.000 (26/26) (9.73)

5th Gear teeth & Ratio 0.767 (23/30) (7.46)

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 175cc (5.9 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 13 P.S.I

Rear Tire Pressure 16 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

Flasher Light 6V 17W

  Tanks:

Gasoline Tank Capacity 2.5 Gallons

Oil Tank Capacity 1.7 Quarts

  Chain:

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

The 1971 Yamaha DT1-E Rider's Manual is Located: CLICK HERE

The 1971 Yamaha DT1E Service Manual is Located: CLICK HERE

The 1971-1973 Yamaha DT/RT Combined Service Manual is Located: CLICK HERE

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

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

The 1971 Yamaha DT1E advertisement is located: CLICK HERE

The 1971 Yamaha DT1E advertisement 2 is located: CLICK HERE

The 1971 Yamaha Full Line Up Brochure is Located: CLICK HERE

The 1971 Yamaha Enduro Full Line Up Brochure is Located: CLICK HERE

The USA 1971 Yamaha DT1-E Brochure is Located: CLICK HERE

The 1971 DT1E Factory Dealership Poster is Located: CLICK HERE

The Germany 1971 Yamaha Full Line Up is Located: CLICK HERE

The 1971 Yamaha DT1-E Store is Located above.