Dunstall Motorcycles
1970 Dunstall Commando Tourer
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
- Norton Commando Frame, Stove Enamelled Black
- Road Holder Forks Fitted With Gaiters
- Twin Leading Shoe Front 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)
- Pannier Cases and Luggage Rack
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 | 5.90 | 93 mph | Third | 6.46 | 85 mph |
| Second | 8.25 | 67 mph | Second | 8.81 | 62 mph |
| First | 12.40 | 44 mph | First | 11.85 | 46 mph |
www.woodgate.org/dunstall/70nor1.html / Webmaster / Revised 24th February 2000