Table of Contents

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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)
Harley-Davidson 1970 - 1977 Service Manual
11) , 12)
Harley Davidson 1970 - 1977 Service Manual
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Trace: • 1970 Sportster