Welcome to the 1971 Yamaha JT1L Forum. The factory Yamaha color was called "Desert Orange". The USA Vin Range was JT1-200101 to 209805. 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.

                  1972 Yamaha JT1L

            Model 1971 Yamaha JT1L

   Dimensions:

Overall Length 62 In. / 1,574MM

Overall Width 27.6 In. / 700MM

Overall Height 36.6 In. / 930MM

Wheelbase 41.5 In. / 1,055 MM

Min. Ground Clearance 6.3 In. / 160MM

    Weight:

Gross 132 LBS / 60KG

Net -

   Performance:

Max, Speed -

Fuel Consumption 176 mpg @ 19MPH

(On paved level roads)

Climbing Ability 22 degrees

Min. Turning Radius 59.1 In. / 1500MM

Braking Distance 24.6 Ft. @ 22 MPH (7.5M @ 35Km/h)

   Engine:

Model JT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 3.54 cu. in. (58cc)

Bore X Stroke 1.654 X 1.654 In. (42MM X 42MM)

Compression Ratio 6.4:1

Max Power 4.5 BHP/7,500 RPM

Max Torque 3.62 Ft.-Lbs @ 5,500 RPM                        

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

Starting System Primary-Coupled Kick

Ignition Timing B.T.D.C 1.8 MM

NGK Spark Plug & Gap B-7HS 0.5 MM (0.023 in)

Contact Break Point Gap 0.012 - 0.015 Inch / 0.3 - 0.4 MM

Volt Reg. Adjustment -

(Volts @ RPM - No load)

Cutout Relay Adjustment -

Condenser Capacity .22UF (Microfarad)

   Carburetor:

Type Y16P Teikei / ID 288E1

Main Jet # 86

Jet Needle /Clip position 032-2

Air Jet -

Needle Jet 2.085

Cut Away 1.5

Pilot Jet (#) 38

Air Screw (turns out) 1 1/2

Starter Jet (#) 50

Float Level -

  Intake:

Air Cleaner Wet, Foam Rubber

   Transmission:

Clutch Wet, Multiple Disk

Primary reduction system Helical Gear

Primary reduction ratio 3.895 / (74/19) Teeth

Trans Oil Capacity .085 Quarts / 800 - 850cc

   Gear Box:

Type Constant Mesh, 4 Speed Forward

1st Gear teeth & Ratio 3.077 (40/13) (reduction 37.7)

2nd Gear teeth & Ratio 1.889 (34/18) (reduction 23.1)

3rd Gear teeth & Ratio 1.304 (30/23) (reduction 16.0)

4th Gear teeth & Ratio 1.038 (27/26) (reduction 12.1)

5th Gear teeth & Ratio -

Secondary reduction system Chain

Secondary reduction ratio 3.153 (41/13)

  Chassis:

Frame Tubular-Double Loop

Front Suspension System Front Telescopic fork

Rear Suspension System Swinging Arm

Fork Oil Capacity (R) 97cc (3.3 once) (L) 120cc (4.1 once)

Front Cushion System Coil Spring / Oil Damper

Rear Cushion System Coil Spring / Oil Damper

  Steering System:

Steering Angle 47 Degrees both left & right

Caster 63.5 Degrees

Trail 2.7 In. / 68MM

  Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

  Tire Size:

Front 2.50 - 15 - 4PR Trials Universal

Rear 2.50 - 15 - 4PR Trials Universal

Front Tire Pressure 22.4 P.S.I

Rear Tire Pressure 28 P.S.I

  Oil Pump:

Adjustment Stroke Min 0.20 - 0.25 MM

Adjustment Stroke Max 1.85 - 2.05 MM

  Dynamo:

Model F11-L46

Manufacturer Hitachi Ltd.

  Battery:

Model -

Manufacturer -

Capacity -

 Lighting:

Head Light 6V 15W

Tail Light 6V 5.3W

Stop Light 6V 17W

Meter Light -

High Beam Indicator Light -

  Tanks:

Gasoline Tank Capacity 1.13 Gallons (4.3 Liters)

Oil Tank Capacity 1.0 Quarts (1.0 Liters)

  Chain:

Tension (Up & down free play) 25MM

The 1971 Yamaha JT1 Owner's Manual is located: CLICK HERE

The 1971 Yamaha JT1 Service Manual is Located: CLICK HERE

The 1972 Yamaha JT1 Combined Service Manual is Located: CLICK HERE

The Canada 1971 Yamaha JT1 (J) Service Manual supplement is located: CLICK HERE

The 1971 Yamaha JT1 Assembly Manual is located: CLICK HERE

The 1971 Yamaha JT1 Parts Manual is located: CLICK HERE

The 1971 Yamaha JT1 racing information is Located: CLICK HERE

The 1971 Yamaha JT1 horse power modifications article is located: CLICK HERE

The Australia 1971 Yamaha JT1 article is located: CLICK HERE

The 1971 Yamaha JT1 autolube output color code is located: CLICK HERE

The 1971 Yamaha JT1 rotary valve installation (timing) is located: CLICK HERE

The 1971 Yamaha line up flyer is located: CLICK HERE

The 1971 USA Yamaha full Line Up Brochure is Located: CLICK HERE

The USA 1971 Yamaha JT1L Brochure is Located: CLICK HERE

The Canada 1971 Yamaha JT1J Brochure is Located: CLICK HERE

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

The 1971 Yamaha JT1L Store is located above