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Dunstall Motorcycles
1971 Dunstall Norton Sprint

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The sprint is a high performance about-town machine which is fun to ride. It's light weight coupled with the 68 bhp (or 70 bhp) with optional extra alloy cyclinder) makes a really exciting combination. Choice of gearing is important: If you want really brutal acceleration and do not mind a top speed handicap of only 115 mph the 4.84 will provide it. If you are looking for more top speed without too much sacrifice on the way up, specify the 4.56 which gives a useful top speed of 123 mph.

Specification (Cycle)

  • Norton Commando Frame
  • Roadholder Forks
  • Twin leading shoe Front Brake (twin disk optional extra)
  • Decibel Silencers
  • 3 or 5 gallon glass fibre or 4 gallon alloy fuel tank
  • Power or balanced exhaust system
  • GT dual seat incorporating locking toolbox, number plate and rear mudguard
  • Glass fibre or polished alloy front mudguard
  • GT or De-Luxe fairing (must be specified with clip-ons)
  • Clip-on, semi-straight or high handlebars
  • Rear set or forward mounted footrests & controls (rear sets advisable with clip-ons)
  • Polished alloy wheel rims
  • Colour options for glass fibre items are: Red, Silver, Yellow, Blue

Engine Specification

  • Bore 73mm Stroke 89mm
  • Capacity 745cc
  • Re-sphered & machined combustion chambers
  • Steeper valve angle (Inlet) 26½°
  • Enlarged hand finished and polished ports
  • Special H 18 S material valves 1 5/8" inlet
  • Bronze Hi-Dural valve guides
  • Special dual rate springs
  • Enlarged induction manifolds
  • 10:1 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 68 Bhp at 7000

Gear Ratio Options

Four speed semi-close ratio

Overall Gearing
Ratio Max Speed
4.84 115 mph
4.56 121 mph
4.38 125 mph
4.15 133 mph

Five Speed Close Ration optional extra


www.woodgate.org/dunstall/71nor2.html / Webmaster / Revised 24th February 2000