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Dunstall Motorcycles
1970 Dunstall Norton Sprint

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1970 Dunstall Norton Sprint

Specification

  • Norton 750 Engine
  • Bore 73mm, Stroke 89mm
  • Capacity 745cc
  • Re-sphered and MAchined Cylinder Head
  • Steeper Valve Angle (Inlet)
  • Enlarged Hand Finished and Polished Ports
  • Special H 18 S Material Larger Valves
  • Bronze Hi-Dural Valve Guides
  • Special Dual Rate Springs
  • Enlarged Induction Manifolds
  • 10 to 1 or 10.5 to 1 Compression Spun Cast Pistons
  • Lucas Capacitor Ignition System
  • Paired Amal 932/901 Type Concentric Carburettors
  • Flexible Forced Oil Feed To Rockers
  • Wide Heat Range Spark Plugs
  • Output 67 b.h.p at 7,000 rpm

Cycle Parts

  • Norton Commando Frame, Stove Enamelled Black
  • Road Holder Forks Fitted With Gaiters
  • Twin Leading Shoe Fron Brake
  • Balanced Exhaust System
  • Decibel Silencers
  • Dural Silencer Mounts
  • 2½ or 4 Gallon Capacity Fuel Tank (Colour Choice)
  • G.T. Dual Seat Incorporating Toolbox, Number Plate and Rear Mudguard (Colour Choice)
  • Glass Fibre Front Mudguard (Colour Choice)
  • Clip-on Semi-Straight or High Handlebars
  • Alloy Control Levers
  • Alloy Fork Top Yoke (with clip-ons only)
  • Polished Alloy Wheel Rims
  • Silver or wrinkle black enamel oil tank and battery cover

Gearbox

Standard Four Speed
Semi Close Ratio
Optional Six Speed
Semi-Close Ratio Gearbox
Gear Ratio Speed Gear Ratio Speed
Top 4.15 133 mph
Fifth 4.78 115 mph
Top 4.84 115 mph Fourth 5.57 96 mph
Third 6.46 85 mph Third 5.90 93 mph
Second 8.81 62 mph Second 8.25 67 mph
First 11.85 46 mph First 12.40 44 mph

www.woodgate.org/dunstall/70nor2.html / Webmaster / Revised 24th February 2000