1970 Sportster

• Engine type: 4 cycle Overhead Valves, 45 degree V2 ¹⁾
• Displacement: 54 ci / 883 cc
• Hemi-spherical style heads
• Bore:²⁾
  • 1970 - 1971: 3 in / 7.62 cm
  • 1972 & later: 3.188 in. / 8.1 cm
• Stroke: 3.8125 in / 9.68 cm ³⁾
• Piston Displacement:⁴⁾
  • 1970 - 1971: 53.9 cu. in. / 883 cc
  • 1972 & later: 60.9 cu. in. / 997.5 cc
• 90 Degree Valve Angle
• Horsepower: 58 @ 6800 rpm ⁵⁾
• Compression: 9.0:1 ⁶⁾
• Torque: 52 ft-lb / 2.191 Nm @ 3800 rpm ⁷⁾

• Fuel capacity: 4 gal / 15.14 l or 2.2 gal / 8.328 l ⁸⁾
• Oil Capacity: 3 qts. / 2.83 l ⁹⁾
• Transmission Capacity: 1.5 pints / .71 l ¹⁰⁾
• MPG: 50mpg (est.)

¹¹⁾

• 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

¹²⁾

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

Tire pressure based on 150 lb rider. When weight is exceeded by 50 lbs or more, increase the rear by 2 lbs and front by 1 lb. Repeat for each additional 50 lbs of weight. ¹³⁾

What is the Current KBB Value? ¹⁴⁾

What is the Current KBB Value? ¹⁵⁾

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