Norton Commando Workshop Manual

## Technical Data

# A

Battery rating: AH 10 at 20 amp/hour
Coil type: 17M6
Ballast resistor type: 3 BR
Contact breaker type: 6CA (1 OCA later models)
Warning light assimilator type: 3 AW
Fuse rating: 35 amp (17 1/2 amp continuous rated)
Direction indicator flasher unit type: 8 FL

|  | Bulbs:
|  |  | Headlight: Type 370 - 12 volt - 45/40 watt Tail light/stop light: Type 380 - 12 volt - 21/6 watt, transverse offset pin Parking light: Type 989 - 12 volt - 6 watt, coil, miniature bayonet cap Direction indicator lights type: 382 Warning lights type: Type 281 - 12 volt - 2.0 watt, coil, sub-miniature

### ENGINE

|  | Specification: | Capacity 745 cc (45 cu. ins.) Bore 2.875 in. (73 mm) Stroke 3.503 (89 mm) Max. Torque: 48 Ib./ft. at 5000 (Standard); 49 Ib./ft. at 6000 (Combat) Compression ratio 9 :1 (Standard); 10:1 (Combat)
| Crankshaft
|  | Material: EN16 Big end journal diameter: 1.7505/1.7500 in. (44.462/44.450 mm) Crankcheek bolts: EN 16 S Balance factor: 52% Dry
| Main bearings: | Pre 1972 | 1972 Onward
|  | Drive side: | Single Lipped Roller | Special Roller (Single Lipped)
|  | Timing side: | Single Row Ball | Special Roller (Single Lipped)
|  |  |  | All 30 mm x 72 mm x 19 mm
| Connecting rods

Material: Aluminium alloy BS.L83 or 2L65 or L77
Length betwean centres: 5.877/5.873 in. (149.275/147.535 mm)
Big end eye l.D.: (Less shells cap bolted on) 1.8950/1.8955 in. (48.133/48.145 mm)
Width at big end eye: 1.010/1.008 in. (25.65/25.60 mm)
Rod side clearance: .013 - .016 ( .330/.406 mm)
Rod end clearance: Less than .001 (.0254 mm)

| Pistons
|  | Material: BS.1490 - LM . .1 3WP Wrist pin boss l.D.: .6869/.6867 in. (17.447/17.442 mm) Diameter - bottom of skirt: 2.8713/2.8703 in (72.931 /72.906 mm)
| Piston rings
|  | Type: | Top chrome compression. Second compression.
|  |  | Taper. "S.E." oil control. Earlier models
|  | Top ring fitted gap: .010 - .012 in. (.254/.305 mm) Middie ring (taper) fitted gap: .008 - .012 in. (.203/.305 mm)
| Wrist pins (Gudgeon pins)
|  | Length: 2.438/2.423 in. (61.925 mm/61.544 mm) Diameter: .6869/.6867 in. (17.447 mm/17.442 mm)

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