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REF: Extra Models11

XR-750 Engine Mechanicals – Top & Bottom End

1972 Specs / Features

New redeigned 750cc engine with aluminum cylinders and heads. Also had new valves, pistons, rods, flywheel assm, “E” cams, carbs and tuned exhaust, 7/8“ dia handlebars with an aluminum ball end clutch lever and a fiberglass seat/fender with with a foam cushion.

  • Engine Type: OHV V-Twin
  • Carburetion: Dual 36mm Mikuni carburetors and specially designed air filters
  • Exhaust System: Tuned duals with reverse-cone megaphones
  • Bore and Stroke: 3.125” x 2.983“
  • Displacement: 45cu, 750cc
  • Compression Ratio: 10:1
  • Max RPM: 8000
  • Clutch Type: Multi-plate dry clutch
  • Primary Drive: 25 tooth engine sprocket, 59 tooth clutch, triple row roller chain
  • Rear Drive: 16 tooth transmission sprocket, 40 tooth rear wheel sprocket
  • Overall Drive Ratio: 5.90:1
  • Transmission: Constant Mesh, 4 speed
  • Transmission Gear Ratios:
    • 1st 2.09:1
    • 2nd 1.51:1
    • 3rd 1.14:1
    • 4th 1:1
  • Weight: 295 lbs
  • Tires (front and rear): 4.0 x 19 on aluminum rims
  • Front Forks: Ceriani with 4.40” travel and aluminum fork bracket
  • Rear Shocks: Girling hydraulic racing shocks
  • Gas Tank: Fiberglass construction with 2-1/2 gallon capacity
  • Oil Tank: 3 quarts
  • Electrical: Fairbanks-Morse magneto
  • Color: Jet Fire Orange



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