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Dunstall Motorcycles
1971 Dunstall Norton 810


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The 810 is a versatile machine that is equally at home in town, on the highway or on a track. Its about town performance is staggering, with under 12 seconds standing quarter acceleration that will drag you clear away from other cycles. Choice of gearing is important. For good all round performance the 4.38 is best, giving 125 mph maximum with 11.9 quarter. The acceleration can be improved still further by specifying the 4.56 or the 4.84, but this will limit the top speed accordingly.

Specification (Cycle)

  • Norton Commando Frame
  • Roadholder Forks
  • Twin Hydraulic Disc Front Brake
  • GT or De-Luxe Fairing
  • Power or Balanced Exhaust System
  • Decibel Silencers
  • Rear Mounted Footrest Controls
  • 3 or 5 gallon capacity glass fibre or 4 gallon alloy fuel tank
  • GT dual seat incorporating locking toolbox, number plate and rear mudguard
  • Glass fibre or polished alloy front mudguard
  • Clip-on handlebars (flat or high bars optional, but they cannot be fitted with fairing)
  • Polished alloy wheel rims
  • Colour options for glass fibre items are: Red, Silver, Yellow, Blue

Engine Specification

  • Bore 76mm Stroke 89mm
  • Capacity 810cc
  • Kight alloy big bore cyclinder
  • 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
  • Light weight camfollowers
  • Lucas capacitor ignition system
  • Paired Amal 932/901 type concentric carburettors
  • Flexible forced oil feed to rockers
  • Wide heat range spark plugs
  • Output 70 Bhp

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/71nor1.html / Webmaster / Revised 24th February 2000