top of page

1971 Yamaha HT1B

Public·2 members

Pinned Post

1971 Yamaha Enduro HT1B 90cc Page

Welcome to the 1971 Yamaha HT1-B Forum. Feel free to post anything related to this model in the category. The Factory color was called Metallic Purple. The USA vin range was HT1-215101 to 229459. Anything new, will be added to this section. If you see any errors, please contact me privately.


                     1971 Yamaha HT1-B Specifications


            Model 1971 Yamaha HT1B

   Dimensions:

Overall Length 73.8 In. / 1,875MM

Overall Width 35.4 In. / 900MM

Overall Height 40.7 In. / 1,035MM

Wheelbase 48 In. / 1,220MM

Min. Ground Clearance 8.9 In. / 225MM

    Weight:

Gross 201 Lbs. / 90Kg

Net 190 Lbs. / 90Kg

   Performance:

Max, Speed 55 MPH / 95Km/h

Fuel Consumption 164.5 MPG @ 25 MPH / 70Km @ 40Km/h

(On paved level roads)

Climbing Ability 25 Degree

Min. Turning Radius 68.9 In. / 1,750MM

Braking Distance 23 Ft. @ 22 MPH (7M @ 35Km/h)

   Engine:

Model HT1

Type 2 Stroke, Gasoline

Lubricating System Separate (Yamaha Autolube)

Cylinder Single, forward inclined 5 Port

Displacement 5.43 cu. in. (89cc)

Bore X Stroke 1.969 X 1.795 In. (50 X 45.6MM)

Compression Ratio 6.8:1

Max Power 8.5 BHP/7,000 RPM

Max Torque 6.51 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 1.8MM +/- .1MM

NGK Spark Plug & Gap B-7H 0.5-0.6 MM

Contact Break Point Gap 0.012 - 0.015 Inch / 0.30 - 0.4 MM

Fuse 10Amp X 2

Condenser Capacity .22UF (Microfarad)

   Carburetor:

Type VM20SC

Main Jet # 85

Jet Needle 4D3-3

Air Jet -

Needle Jet N - 6

Cut Away 2.0

Pilot Jet (#) 30

Air Screw (turns out) 1 3/4

Starter Jet (#) 40

Float Level 22.5MM

Idle Speed 1350 - 1450 RPM

  Intake:

Air Cleaner Wet, Foam Rubber

   Transmission:

Clutch Wet, Multiple Disk

Primary reduction system Helical Gear

Primary reduction ratio 3.894 / (74/19) Teeth

Trans Oil Capacity 650 - 700cc / .69 - 0.79 Qts

   Gear Box:

Type Constant Mesh, 5 Speed Forward

1st Gear teeth & Ratio 3.182 (35/11) 43.373

2nd Gear teeth & Ratio 2.000 (30/15) 27.263

3rd Gear teeth & Ratio 1.368 (26/19) 18.653

4th Gear teeth & Ratio 1.000 (23/23) 13.631

5th Gear teeth & Ratio 0.800 (20/25) 10.905

Secondary reduction system Chain

Secondary reduction ratio 3.500 (49/14)

  Chassis:

Frame Tubular-Double Loop

Front Suspension System Front Telescopic fork

Rear Suspension System Swinging Arm

Fork Oil Capacity 132cc - 147cc (4.5 - 5.0 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 4.3 In. / 110MM

  Braking System:

Type of brake Internal Expansion

Front Operation System Right hand operation

Rear Operation System Right foot operation

  Tire Size:

Front 2.75 - 18 - 4PR Trials Universal

Rear 3.00 - 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 F130-07

Manufacturer Hitachi Ltd.

  Battery:

Model 6N2-2A-3

Manufacturer Furukawa Battery

Capacity 6V 2AH

 Lighting:

Head Light 6V 25W/25W

Tail Light 6V 5.3W

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 1.7 Gallons (6.5 Liters)

Oil Tank Capacity 1.3 Quarts (1.2 Liters)

  Chain:

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

The 1971 Yamaha HT1B Rider's Manual is Located: CLICK HERE

The 1971 Yamaha HT1B Rider's Manual 2nd edition is located: CLICK HERE

1971 Yamaha HT1B Service Manual

The 1971 Yamaha HT1B Service Manual located: CLICK HERE

1971 Yamaha HT1-B Parts Manual Supplement

The 1971 Yamaha HT1B Parts Manual Supplement is Located: CLICK HERE

The Primary HT1 Parts Manual is Located: CLICK HERE


The 1971 Yamaha HT1B Article is Located: CLICK HERE


The 1969-1971 Yamaha Autolube Adjustment & Color Codes are Located: CLICK HERE


1971 Yamaha HT1B Brochure

The 1971 Yamaha HT1-B Brochure is Located: CLICK HERE


The 1971 Yamaha HT1-B Factory Dealership Poster is Located: CLICK HERE


1971 Yamaha Full Line Up Brochure: CLICK HERE

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

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

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

1971 Yamaha HT1B Advertisement

The 1971 Yamaha HT1B Advertisement is Located: CLICK HERE


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

The 1971 Yamaha HT1B Store is Located: CLICK HERE

116 Views

About

Anything related to this model.

Members

© 2015 by Site Admin.

                                                                       Disclaimer

This site is not affiliated with Yamaha Motor Corporation. The use of the word "Yamaha" or any specific model designation is purely for informational purposes to assist users of this site and in no way indicate any endorsement by or approval of this site by Yamaha Motor Corporation. The word "Yamaha", the tuning fork logo or other trademarked logos and all other product names are, or may be, trademarks or registered trademarks of Yamaha Motor Corporation. All other company and product names are trademarks or registered trademarks of their respective companies.

bottom of page