Welcome to the 1971 Yamaha RT1-B Forum. The factory paint color was called "Yamaha Black W/Red". The USA vin number range is: RT1-09101 to 24820. Feel free to post anything related to this model in the category. Anything new, will be added to this section.

                    1971 Yamaha RT1-B Specifications

            Model 1971 Yamaha RT1B

   Dimensions:

Overall Length 82.7 In.

Overall Width 35.0 In.

Overall Height 45.7 In.

Wheelbase 54.7 In.

Min. Ground Clearance 10.0 In.

    Weight:

Gross -

Net 258 Lbs.

   Performance:

Max, Speed 78 Mph +

Fuel Consumption 82 MPG @ 37 MPH

(On paved level roads)

Climbing Ability 35 Degree

Min. Turning Radius 78.7 In.

Braking Distance 49 Ft. @ 31 MPH

   Engine:

Model RT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 21.4 cu. in. (351cc)

Bore X Stroke (80MM X 70MM)

Compression Ratio 6.3:1

Max Power 30 BHP/6,000 RPM

Max Torque 26 Ft.-Lbs @ 5,500 RPM                        

Piston Skirt Clearance .0022 - .0024 In. / 0.55 - 0.60MM                                         

Starting System Primary-Coupled Kick

Ignition Timing B.T.D.C 2.9 MM +/- .1 MM

NGK Spark Plug & Gap B-9ES 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 Mikuni VM32SH

Main Jet # 240

Jet Needle 6FC1 - 2

Air Jet -

Needle Jet 0 - 4

Cut Away 1.5

Pilot Jet (#) 30

Air Screw (turns out) 1 3/4

Starter Jet (#) 60

Float Level 8.5MM

  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) (20.38)

2nd Gear teeth & Ratio 1.789 (34/19) (14.40)

3rd Gear teeth & Ratio 1.304 (30/23) (10.49)

4th Gear teeth & Ratio 1.000 (26/26) (9.078)

5th Gear teeth & Ratio 0.767 (23/30) (6.17)

Secondary reduction system Chain

Secondary reduction ratio 2.600 (39/15)

  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 - 1A1L

Manufacturer Mitsubishi Elec.

  Battery:

Model MV1-6D

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 (9.5 Liters)

Oil Tank Capacity 1.7 Quarts (1.6 Liters)

  Chain:

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

The 1971 Yamaha RT1-B Rider's Manual is Located: CLICK HERE

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

The International 1971 - 1974 DT RT 250/360 Service Manual is located: CLICK HERE

The 1971 Yamaha RT1-B Parts Manual Supplement is located: CLICK HERE

The Australia Yamaha RT1F Parts Manual is located: CLICK HERE

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

The USA 1971 Yamaha RT1B Brochure is Located: CLICK HERE

The 1971 Yamaha Line Up Brochure is Located: CLICK HERE

The 1971 Yamaha Enduro Line Up is located: CLICK HERE

The 1971 Yamaha RT1-B AMA News Article is Located: CLICK HERE

The 1971 Yamaha RT1-B Article # 1 is Located on page 70/108, It is Located: CLICK HERE

The 1971 Yamaha RT1B Article # 2 is Located: CLICK HERE

The 1971 Yamaha RT1B Advertisement # 1 is Located: CLICK HERE

The 1971 Yamaha RT1B Advertisement # 2 is Located: CLICK HERE

The Japan Domestic Model (JDM) 1971 Yamaha RT1B calendar/poster is Located: CLICK HERE

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

The JDM RT1B Brochure is Located: CLICK HERE

The Canada 1971 Yamaha Line Up Brochure is located: CLICK HERE

The 1971 Motorcycle & Trail Bike Handbook is located: CLICK HERE

1971 Yamaha RT1B Parts CLICK HERE