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Norton Commando Engine Specs
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750 |
850 |
Capacity
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745cc (45 cu. in.) |
828cc (50.5 cu. in.) |
Bore
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2.875 in. (73mm) |
3.030 in. (77mm) |
Stroke
|
3.503 in. (89mm) |
3.503 in. (89mm) |
Max. Torque(5000 rpm)
|
48 lb./ft. (Combat 49lb) |
56 lb./ft. |
Compression Ratio
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9:1 (Combat 10:1) |
8.5:1 |
Maximum Speed
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112 MPH (Standard) |
122 MPH |
Spark Plug
|
Champion N7Y or Equivalent. |
Spark Plug Gap
|
.023 – .028 in. |
Contact Breaker Gap
|
.014 – .016 in. |
Ignition Timing
|
28 degrees BTDC (Fully Advanced) |
Valve Clearances (Cold)
|
750 |
850 |
Inlet
|
.006 in. (Combat .008) |
.006 in. |
|
.008 in. (Combat .010) |
.008 in. |
Camshaft Chain Adj.
|
3/16 in. (4.8mm) play at top of chain. |
Valve Seat Angles
|
45 degrees inlet and exhaust |
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Norton Commando Primary
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Engine Sprocket
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26 Teeth |
Clutch Housing
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57 Teeth |
Primary Chain
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Triple Row, 92 Pitches, .375in. x .250in. |
Rear Chain
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99 Pitches, .400in. x .380 in. |
Clutch Pushrod Length
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9.813/ 9.803 in. (244.250/ 243.996 mm) |
Clutch Pushrod Diameter
|
.237/ .232 in. (6.019/ 5.892 mm) |
Clutch Ball Bearing
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1/2 in. (12.70) Diameter |
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4 fiber clutch, 5 metal clutch (Sintered Bronze) |
Clutch Adjuster
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1/2 in. x 20 UNF 2A |
Clutch Adjuster Length
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.904 in. x .894 in ( 22.962/ 22.708 mm) |
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Norton Commando Gearbox
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Estimated Speeds Using 19-23 Tooth Gearbox Sprockets
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Sprocket Size |
Overall Gear Ratio |
6000 rpm |
6500 rpm |
7000 rpm |
19 |
4.84 |
92 mph |
99 mph |
107 mph |
20 |
4.60 |
97 mph |
105 mph |
113 mph |
21 |
4.38 |
102 mph |
110 mph |
119 mph |
22 |
4.18 |
106 mph |
115 mph |
121 mph |
23 |
3.99 |
112 mph |
121 mph |
130 mph |
( I recommend using a 20 or 21 tooth sprocket depending on where you live)
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Number Of Teeth On Pinions
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First Layshaft 28 teeth
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Second Layshaft 24 teeth
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Third Layshaft 20 teeth
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Fourth Layshaft 14 teeth
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First Mainshaft 14 teeth
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Second Mainshaft 18 teeth
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Third Mainshaft 21 teeth
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Fourth Mainshaft 23 teeth
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Ball Journal Bearings
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Mainshaft (Clutch End) 11/4 x 21/2 x 5/8 in.
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Mainshaft (Kickstarter) 5/8 x9/16 x 7/16 in.
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Layshaft (Clutch) 17mm x 40mm x 12mm
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Norton Commando Carb
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Standard 750 (Twin Amal 930 30mm)
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Main Jet |
Needle Jet |
Needle Position |
Throttle Valve |
1970 |
220,180, or 210 |
.107 |
Middle |
3 |
1971 |
220 |
.106 |
Middle |
3 |
1972 |
220 or 210 |
.106 |
Middle/ Top |
3 |
Standard 850 (Twin Amal 932 32mm) |
Main Jet
|
260 |
Needle Jet |
106 |
Needle Position |
Top |
Throttle Valve |
31/2 |
Needle |
928/104 |
Choke Tube |
928/ 107 |
Air Filter |
Pleated impregnated paper |
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Norton Commando Frame & Isolastics
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Front Isolastic
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Shim Thickness Available
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.005, .010, .020, .030, in. |
Free Play
|
.010 in. |
Bolt
|
7.13 in., 1/2 in. x 20 UNF. |
Buffer Quantity
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2 |
Buffer Diameter
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1 11/16 in. |
Buffer Thickness
|
1/2 in. |
Bush Quantity
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2 |
Bush Thickness
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5/8 in. tapered to .510 in. |
Spacer
|
2.573/ 2.553 |
Rear Isolastic
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Bolt Torque Setting
|
300 in./ lb. |
Shim Thickness Available
|
.005, .010, .020, .030, in. |
Free Play
|
.010 in. |
Stud
|
13 in. |
Stud Thread Size
|
1/2 in. x 20 UNF 2A |
Buffer Quantity
|
2 |
Buffer Diameter
|
1 5/16 in. |
Buffer Thickness
|
1/2 in. |
Bush Quantity
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3 |
Bush Thickness
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1/2 in. tapered to .410 in. |
Spacer
|
1.560 in./ 1.550 in. |
Dimensions
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Height
|
40.75 in. |
Length
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87.5 in. |
Wheelbase
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56.75 in. |
Weight (Roadster)
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420 lb |
Weight (Interstate)
|
435 lb. |
Width
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26 in. |
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17ft.10 in. |
Center of Gravity
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19 3/4 in. |
Seat Height
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33 1/2 in. |
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Norton Commando Forks and Shocks
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Forks ( Telescopic with internal Springs Hydraulically damped)
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Total Fork Travel
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6 in. |
Fork Leg Oil Capacity
|
150 cc in each leg |
Springs
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75 1/2 Coils |
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18.687 in. free length |
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36.5 lb./ in |
Shocks (Girling Oil filled with External Springs)
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Spring Free Length
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8.75 in. |
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126 lb. per in. (depends on adjustment) |
Fitted Length
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8.4 in. |
Total Length
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13 in. |
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Norton Commando Brakes Wheels Tires
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Front Wheel
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Rim Size
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WM2 – 19 in. |
L.H. Wheel Bearing
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17x40x12 mm. |
R.H. Wheel Bearing
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NM 17721 |
Spindle
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.66671/ 6670 in. |
Tire Size
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4.10 x 19 in. |
Tire Pressure
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26 PSI |
Tire Diameter
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26.46 in. (Dunlop) |
Tire Width
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4 in. |
Front Brake (Disc)
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Pad friction area
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1.65 in. |
Pad Thickness (New with Backing)
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.38/ .37 in. |
Pad Minimum Thickness
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.0625 in. |
Disc Diameter
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10.70 in. |
Disc Width
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.260/ .250 in. |
Brake Fluid
|
Lockheed 329 Quality |
Front Brake (Drum)
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Type
|
Twin Leading Shoe |
Drum Diameter
|
8 in. |
Brake lining area Total
|
18.69 Sq. in. |
Rear Wheel
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Rim Size
|
WM2 – 19in. |
Wheel Bearings
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17x40x12 mm |
Sprocket Bearing
|
NM 177721 |
Tire Size
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4.10x19in. |
Tire Pressure
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26 lbs./PSI |
Tire Diameter
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26.46 in. |
Tire Width
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4 in. |
Rear Brake
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Drum Internal Diameter (New)
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7.007/ 6.997 in. |
Brake lining area Total
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13.6 Sq.in. |
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Norton Commando Electrical Lucas
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General
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Voltage
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12 V Positive earth/ ground |
Alternator
|
RM 21 |
Rectifier
|
2 DS 506 |
Zener Diode
|
Z D 715 |
Battery Rating
|
10 Amp Hour at !0 hour rate |
Coil
|
17 M6 |
Ballast Resistor
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3 BR |
Contact Breaker
|
6 CA or 10CA |
Warning Light Assimilator
|
3 AW |
Fuse
|
35 Amp. |
Flasher Unit
|
8FL |
Bulbs
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Headlight
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12 V 45/40 Watt |
Tail/ Stop light
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12V 21/ 6 Watt Offset |
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12V 6 Watt Bayonet |
Direction Indicators
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12V 21 Watt |
Warning Lights
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12V 2 Watt |
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Norton Commando Torque Settings
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3/8 in. Cylinder head nuts & bolts
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30 ft./lb. |
5/16 in. Cylinder head bolts
|
20 ft./lb. |
3/8 in. Cylinder base nuts
|
25 ft./lb. |
5/16 in. Cylinder base nuts
|
20 ft. /lb. |
Cylinder through bolt (850cc)
|
30 ft./lb. |
Con rod nuts
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25 ft./lb. |
Rocker cover plate bolt
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8 ft./lb. |
Crankshaft nuts
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25 ft./lb. |
Cam Chain tensioner nuts
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15 ft./lb. |
Oil Pump stud nuts
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15 ft./lb. |
Rocker feed banjo bolts
|
15 ft./lb. |
Engine mount bolts
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25 ft./lb. |
Rotor nut
|
80 ft./lb. |
Alternator stud nuts
|
15 ft./lb. |
Clutch to Mainshaft nut
|
70 ft./lb. |
Mainshaft nut
|
40/50 ft./lb. |
Counter shaft sprocket nut
|
80 ft./lb. |
Gearbox inner cover nuts
|
12 ft./lb. |
Top gearbox fixing bolts
|
55 ft./lb. |
Rear shock nuts
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30 ft./lb. |
Isolastic bolts
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25 ft./lb. |
Fork Top nuts
|
30 ft./lb. |
Fork Yoke Pinch bolts
|
30 ft. /lb. |
Steering head main nut
|
30 ft./lb. |
Disk Caliper mounting bolts
|
30 ft./lb. |
Disk Caliper end plug
|
26 ft./lb. |
Disc Mounting nuts
|
20 ft./lb. |
Drum brake cam nuts
|
30 ft./lb. |
Sidestand nut
|
50 ft./lb. |
Zenor Diode nut
|
2 ft./lb. |
|
1 ft./lb. |
Oil pressure release valve
|
25 ft./lb. |
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Norton Commando Capacities
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Engine oil tank
|
5 imp./ 6 US. Pints |
Primary Chaincase
|
200 cc, 7 fl.oz. |
Gearbox
|
.75 imp./ .9 US. Pints |
Front Forks
|
150 cc, 5 fl.oz. |
Interpol fuel tank
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4 imp. gallons |
Interpol fuel tank (radio)
|
3 1/2 imp.gallons |
Interstate fuel tank
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5 1/2 or 5 1/4 gallons |
Hi Rider fuel tank
|
2 imp. gallons |
Roadster fuel tank
|
2 1/4 or 2 1/2 gallons |
Fastback fuel tank
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3 1/4 or 4 gallons |
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