1971 Norton Commando 750 Fastback

Make Model.	Norton Commando 750 Fastback
Year	1971
Engine	Four stroke, parallel twin cylinder, push rod, 2 valves per cylinder.
Capacity	745 cc / 45.5 cu in
Bore x Stroke	73 x 89 mm
Compression Ratio	9.0:1
Cooling System	Air cooled
Induction	2 x 30mm Amal concentric carburetors
Ignition	12V, alternator
Starting	Electric and kick
Max Power	58 hp / 43 kW @ 6800 rpm
Transmission	4 Speed
Final Drive	Chain
Front Suspension	Telescopic forks
Rear Suspension	Dual shocks, 5-way adjustable
Front Brakes	Single 203 mm Drum, twin leading shoe
Rear Brakes	Single 178 mm Drum, twin leading shoe
Front Tyre	4.10-19
Rear Tyre	4.10-19
Dimensions	Length 2220 mm / 87.5 in Width 660 mm / 26 in
Wheelbase	1441 mm / 56.75 in
Seat Height	863.6 mm / 34 in
Dry Weight	190 kg / 420 lbs
Fuel Capacity	10 Litres / 2.6 US gal
Top Speed	187 km/h / 116 mph

The original model was designated the 'Fastback' in March 1969 to differentiate it from the newly introduced 'S' and 'R' models. A modified frame was fitted to overcome the earlier breakages. A Mk2 Fastback was introduced in September 1970 with revised stands, chain guard, alloy levers with integrated switchgear and the 20M3S engine. A metal tank, 4.10 x 19 front tyre, upswept exhausts and reverse cone megaphone silencers were fitted on the 1971 MK3.

The ‘Combat engine’ engine was introduced in January 1972 in the Mk4 Fastback. The last of the fastbacks, the MkV, was produced from November 1972 to mid-1973 as a 1973 model and featured improved crank bearings and the standard grind camshaft. Compression was reduced to 9.4:1.