Norton Commando Workshop Manual

## Technical Data

# A

### SECTION A

### TECHNICAL DATA

### FRAME, ENGINE MOUNTINGS AND REAR SUSPENSION UNITS

| Steering head bearing type: Double sealed ball (2 off single row sealed ball) Front engine mounting:

Spacer length: 2~573/2~553 in. (65 3/64 8 mm)
Bonded bush thickness: 5/8 in. tapering to 0.510 in. (15.87 mm tapering to 12.95 mm)
Bonded bush quantity: 2
Bufferthickness: 1/2 in. (12.70 mm)
Buffer outside diameter: 1 11/16 in. (42.8 mm)
Buffer quantity: 2
Bolt size: 7.13 in. 1/2 in. x 20 UNF
Ideal free play: 0.010 in. (.254 mm)
Shim thicknesses available: .005 in., .010 in., .020 in., .030 in. (.127 mm, .254 mm,
.508 mm, .762 mm)

| Rear engine mounting

Spacer length: 1.560 in./1.550 in. (39.6/39.37 mm)
Bonded bush thickness: 1/2 in. tapering to 0.410 in. (12.70 mm tapering to 10.4 mm)
Bonded bush quantity: 3
Buffer thickness: 1/2 in. (12.70 mm)
Buffer outside diameter: 1 5/16 in. (33.3 mm)
Buffer quantity: 2
Stud thread size: 1/2 in. x 20 UNF 2A
Stud length: 13.00 in. (330.2 mm)
Ideal free play: 0.010 in. (.254 mm)
Shim thicknesses available: .005 in., .010 in., .020 in., .030 in. (.127 mm, .254 mm,
.508 mm, .762 mm)
Bolt torque setting: 300 in./lb. (3.456 kg./mtr.)

| Rear suspension units
|  | Type-Girling: Spring/oil damped Spring fitted length: 8.4 in. (213.36 mm) Spring colour code: Red/Yellow/Red (chrome spring) Spring rate: 126 lb. per inch

### SPEEDOMETER GEARING

| Using Dunlop 4.10 in. x 19 in. rear tyre
|  | Rolling radius: 12.57 in. (319.3 mm) Revs./mile: 806 Gearbox ratio: 15/12 1:1.25

### WHEELS AND BRAKES

| Front wheel
|  | Rim size: WM2-19
|  | Spokes - Drum brake wheel: | Inside LH-90° head. 8 SWG swaged, 375 in. (9.5 mm) head
|  |  | Outside - 90° head. 8 SWG swaged, ¥531 in. (1 3~45 mm) head
|  | Spokes - Disc brake wheel: | Inner L.H. - 90° head 9 SWG | .270 (6.9 mm) head
|  |  | Outer L.H. - 90° head 9 SWG | .270 (6.9 mm) head (80°bend)
|  |  | Right hand - 90° head 8 SWG | .290 (7.35 mm) head
|  | Wheel bearing L.H.: 17 mm x 40 mm x 12 mm Wheel bearing R.H.: NM 17721 Bearing housing l.D.: 1.5732 in./1.5740 in. (39.95 mm/39.97 mm) Spindle (bearing/dia.): 0.6675/0.6670 in. (18.554/18.542 mm)

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