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. If you see any errors, please contact me privately.

                    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 1971 Yamaha RT1-B Parts Manual Supplement 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

The 1971 Yamaha RT1-B Parts Store is Located: CLICK HERE