Table of Contents

This is an old revision of the document!

1970 Sportster

Engine

  • Engine type: 4 cycle Overhead Valves, 45 degree V2 1)
  • Displacement: 54 ci / 883 cc
  • Hemi-spherical style heads
  • Bore: 3 in / 7.62 cm 2)
  • Stroke: 3.8125 in / 9.68 cm 3)
  • 90 Degree Valve Angle
  • Horsepower: 58 @ 6800 rpm 4)
  • Compression: 9.0:1 5)
  • Torque: 52 ft-lb / 2.191 Nm @ 3800 rpm 6)

Capacities

  • Fuel capacity: 4 gal / 15.14 l or 2.2 gal / 8.328 l 7)
  • Oil Capacity: 3 qts. / 2.83 l 8)
  • Transmission Capacity: 1.5 pints / .71 l 9)
  • MPG: 50mpg (est.)

Dimensions

XL, XLHXLCH
Wheelbase 58 1/2 in / 148.59 cm58 1/2 in / 148.59 cm
Overall Length87 1/4 in / 221.61 cm87 1/4 in / 221.61 cm
Overall Width 33 in / 83.82 cm33 in / 83.82 cm
Overall Height40 1/2 in / 103 cm42 in / 106.7 cm
Road Clearance6 3/4 in / 17.145 cm6 1/2 in / 16.51 cm

10)

Drivetrain

  • Constant Mesh - Foot shift
  • Speeds - 4 Forward
  • Number of Sprocket Teeth
    • Engine: 34
    • Clutch: 59
    • Transmission: 20 (XLCH 19)
    • Rear Wheel: 51
  • Gear Ratios (XL,XLH)
    • 1st: 11.16 to 1
    • 2nd: 8.08 to 1
    • 3rd: 6.11 to 1
    • 4th: 4.42 to 1
  • Gear Ratios (XLCH)
    • 1st: 11.74:1
    • 2nd: 8.50:1
    • 3rd: 6.43:1
    • 4th: 4.66:1

Tires

GoodyearYokohama
FrontMM90-19 (3.75×19) Sport RibY-980 (3.75x19T) High Speed
Rear4.25×18 All TractionY-622 (4.25x18T) High Speed

11)

  • Tire pressure
    • Front: 24 psi / 1.655 bar
    • Rear: 30 psi / 2.068 bar

12)

Models

Back to Sportster History Index

1) , 2) , 3) , 4) , 5) , 6) , 7) , 8) , 9) , 10) , 11) , 12)
Harley-Davidson 1970 - 1977 Service Manual
This website uses cookies. By using the website, you agree with storing cookies on your computer. Also you acknowledge that you have read and understand our Privacy Policy. If you do not agree leave the website.More information about cookies

Trace: • 1970 Sportster