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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