Speedometers and Cables

Tachometer drive parts may be found here timing chests, click here for oil pumps.

When fitting a reconditioned speedometer it is advisable to also fit a new cable as an old one may damage the new unit. The cable can be tested by holding one end of the inner cable and attempting to twist the other end, more than a ¼ to ½ a turn of movement indicates that it should be replaced.

A group speedometers were always driven from the gearbox and were initially mounted on a bracket on the forks and from 1953 in the headlamp cowl. The instruments on the sporting Road Rocket and Super Rockets were mounted a variety of brackets depending on whether 1 or 2 instruments were fitted. It would appear that there was an option to have only a rev counter fitted or a speedometer as well for 1954-57; whilst for 1958-62 either or both could be fitted. From 1960 the Super Rocket was supplied with either the cowl, with speedometer in it or with headlamp ears and the clock(s) on brackets. The rev counter was driven from the magneto until 1960 when the drive was taken from the oil pump instead.

B group Speedos were mounted on a fork top bracket before the war and driven from the front wheel. With the introduction of telescopic fork models the speedometer moved initially to the petrol tank until 1948 when it moved to the forks. Drive on telescopic models was from the gearbox.

C group speedometers were initially driven from the front wheel and mounted on top of the forks. With the advent of the telescopic forks the drive moved to the rear wheel and the speedometer head moved to the tank. When the 4 speed gearboxes were introduced in 1951 the speedometer was driven from the gearbox and the speedometer was on the forks.  In July 1954 the speedometer on 3 speed gearbox equipped machines moved to the forks but the drive remained at the rear wheel. The C10L used a ‘D’ shaped speedometer.

M group girder fork speedometers were driven from the front wheel but telescopic fork model’s drive came from the gearbox. The speedometer was always on the forks mounted on a bracket either to the side or centrally.

PART No

DESCRIPTION

Per

MODEL

YEARS

15-6939

Front wheel internal drive pinion retaining peg 1 All ?-39

5204-38

Speedo bezel, plain. For free standing speedometer 1

5204-47

Speedo bezel, sheet panel, lipped type, inc rubber and glass 1

641

Bulb, chronometric speedometer, 6V 2W 1

A50-91

Bulb holder with bulb for Chronometric speedometer 1 All 1938-62

PA-40

Bracket for Indian and Taiwanese clocks

00610

Trip cable 8 ½” overall

5200-97

Speedo face, please specify model details as they are correct even down to the speedometer model number.

5201-99

Chronometric speedometer 1 All

02-0204

Bolt, mounting plate to forks 2 A10RR/SR 1954-59

02-0443

Lock nut for speedo & rev counter bracket to mounting plate 4 A10RR/SR 1954-59

02-1462

Spring washer, mounting plate to forks 2 A10RR/SR 1954-59

02-2395

Nut for speedometer & rev counter bracket to mounting plate 4 A10RR/SR 1954-59

15-7383

Rubber mount for speedometer 4 A10RR/SR 1954-59

15-7383

Rubber mount for rev counter bracket (when both fitted) 4 A10RR/SR 1954-59

15-7383

Rubber mount, rev counter bracket (when only rev counter fitted) 2 A10RR/SR 1954-59

19-2126

Tube for cable through headlamp 1 A not RR 1953-55

24-8328

Bolt, fixing rev counter bracket (when only rev counter fitted) 2 A10RR/SR 1954-59

27-8560

Plain washer for speedometer & rev counter bracket 4/5 A10RR/SR 1954-59

29-0541

Shake proof washer, clock brackets to mounting plate 4 A10RR/SR 1954-59

42-0195

Rev counter adapter on timing case 1 A10 SR 1960-62

42-0196

Rev counter pin (between oil pump spindle and cable) 1 A10 SR 1960-62

65-9111

Speedo and rev counter bracket (when both fitted) 2 A10RR/SR 1954-59

65-9111

Speedo bracket (when only speedometer is fitted) 1 A10RR/SR 1954-59

65-9111

Speedometer bracket on forks 1 A 1948-52

65-9167

Rev counter bracket (when only rev counter fitted) 1 A10RR/SR 1954-59

65-9171

Speedo and rev counter mounting plate (when both fitted) 1 A10RR/SR 1954-59

65-9179

Bolt, fixing speedometer bracket 2 A10RR/SR 1954-59

65-9179

Bolt, fixing rev counter bracket (when both fitted) 2 A10RR/SR 1954-59

67-0713

Rev counter drive nut on magneto 1 A10RR/SR 1954-60

67-5088

Speedometer grommet in cowl 1 A 1953

67-9057

Speedo cable, 40.5” 1 A 1947-52

67-9063

Speedo cable, 41” 1 A Plunger 1953-57

65-9267

Speedo cable, 44” 1 A7/7SS/10 S’arm 1954-59

42-9187

Speedo cable, 44” 1 A7/7SS/10/Spit 1960-62

67-9057

Speedo cable, 40.5” 1 A10RR/SR 1954-59

65-9267

Speedo cable, 44” 1 A10Spit 1958-59

65-9267

Speedo cable, 44” 1 A10SR 1960-63

65-9172

Rev counter cable 38” 1 A10RR/SR 1954-60

42-9227

Rev counter cable 34 ½” 1 A10SR 1961-62

02-0204

Bolt, bracket to forks 2 B 1948-53

02-1462

Spring washer, bracket to forks 2 B 1948-53

15-7383

Rubber washer, bracket to forks 4 B32/4 1954-56

19-2126

Tube for cable through headlamp 1 B 1953-55

27-8560

Plain washer, bracket to forks 2 B32/4 1954-56

65-9111

Speedometer bracket 1 B31/3 1948-52

65-9111

Speedometer bracket 1 B32/4 1948-56

65-9179

Bolt, bracket to forks 2 B32/4 1954-56

67-5088

Speedometer grommet in cowl 1 B 1953-57

65-9102

Speedo cable, 39” 1 B 1946-47

65-9150

Speedo cable, 44.5” 1 B 1948

65-9160

Speedo cable, 46.75” 1 B31/33 1949-52

65-9160

Speedo cable, 46.75” 1 B32/34 Rig/Plun 1949-55

29-9326

Speedo cable, 56” 1 B31/33 Rig/Plun 1953-55

67-9057

Speedo cable, 40.5” 1 B S’arm 1954-55

65-9267

Speedo cable, 44″ 1 B31/33 S’arm 1956-60

65-9257

Speedo cable, 46.75” 1 B32/34 1956-60

65-9172

Cable, chronometric tachometer 38″ 1 B32/34 1954-60

15-7383

Rubber washer, bracket to forks 4 C (3 speed from 7/54) 1951-58

27-8560

Plain washer, bracket to forks 2 C (3 speed from 7/54) 1951-58

65-9111

Speedometer bracket 1 C (3 speed from 7/54) 1951-58

65-9179

Bolt, bracket to forks 2 C (3 speed from 7/54) 1951-58

29-9320

Speedo cable, girder fork models, 23.625” 1 C 1946

29-9326

Speedo cable, telescopic fork models (to June 1954), 56” 1 C 3 speed 1946-54

90-9021

Speedo cable (from July 1954), 65” 1 C 3 speed 1954-55

67-9057

Speedo cable, not C10L, 40.5” 1 C 4 speed (not C10L) 1951-58

29-9402

Speedo cable, 37.5” 1 C10L 4 speed 1956-57

02-1374

Plain washer, bracket to forks 2 M Plun/AA 1951-62

15-7383

Rubber washer, bracket to forks 4 M Plun 1951-52

21-5620

Bolt, speedometer bracket to forks 2 M/AA 1949-54

24-8328

Bolt, speedometer bracket to forks 2 M Plun/AA 1951-62

24-8784

Spring washer, bracket to fork 2 M 1940-48

28-2338

Bolt, speedometer bracket to forks (central position) 2 M 1948

65-9111

Speedometer bracket (central position) 1 M 1949-52

65-9111

Speedometer bracket (central position) 1 M AA 1950-62

66-9114

Speedometer bracket (side mounted) 1 M Gir 1940-47

65-9179

Bolt, speedometer bracket to forks 2 M AA 1955-62

66-9262

Distance piece, bracket to forks 2 M AA 1950-62

67-5088

Speedometer grommet in cowl 1 M 1953-57

24-5484

Speedo cable, 27.25” 1 M 1938-39

66-9112

Speedo cable, 24.5” 1 M 1940-47

66-9145

Speedo cable, 26.75″, girder fork top speedometer 1 M 1947-48

29-9341

Speedo cable, 50” 1 M 1949-63

66-9177

Speedo cable, 50” 1 M AA 1949-63
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