Technical Data

A

Tyre size: 4.1OX19
Tyre pressure: 26 Ibs./psi (1.83 kg/sq. cm.). Refer "Tyre Pressures" section for permissible variation
Tyre diameter (Dunlop): 26.46 in. (672 mm)
Sectional width (Dunlop): 4 in. (101.6 mm)

Front brake (drum)

Type: Internal expanding two leading shoe
Drum dia.: 8 in. (203.2 mm)
Lining area - total 2 Shoes: 18.69 sq. in./474.776 sq. mms

Front brake (disc)

Type: Disc- hydraulically operated
Pad type: Steel backed, mouided and bonded friction material
Pad friction area diam.: 1.65 in. (41.9 mm)
Pad new thickness (Pad and backing together): .38/.37 in. (9.652/9.398 mm)
Disc diameter: 10.70 in. (271.7 mm)
Disc width at friction area: 0.260/0.250 in. (6.604/6.35 mm)
Brake fluid type: Lockheed series 329 Hydraulic Fluid for disc brakes. (Complies with U.S. Safety Standard 116)

Rear wheel

Rim size: WM2 - 19

Spokes:

Rear outer: 6.093 in. Iong: 8/10 SWG: 90° head: offset length .531 in. (13.45 mm)

Rear inner: 6.093 in. Iong: 8/10 SWG: 90° head: offset length .375 in. (9.5 mm)

Wheel bearings 1971 on: Ball journal 17 mm x 40 mm x 12 mm
Sprocket bearing: NM.17721: post 1971
Hub bearing housing I.D.: 1.5732/1.5740 in. (39.95 mm/39.97 mm)
Tyre size: 4.10 x 19 in.

Tyre pressure:

26 Ibs./psi (1 83 kg/sq. cm.). Refer "Tyre Pressure" section for permissible variation

Tyre diameter (Dunlop): 26.46 in. (672.084 mm)
Tyre sectional width (Dunlop) :4 in. (101.6 mm)

Rear brake

Internal drum dia.: 7.007/6.997 in. (177.8 mm)
Lining area - total 2 Shoes: 13.6 sq. in./345.44 sq. mm.

Front forks

Type: Telescopic, hydraulically damped, internal springs
Main tube O.D.: 1.3590/1.3575 in. (34.29 mm/34.467 mm)
Top bush fitted I.D.: 1.3595/1.3605 in. (34.53/34.48 mm)
Bottom bush O.D.: 1.4980/1.4990 in. (38.05 mm/38.075 mm)
Fork slider I.D.: 1.4995/1.5010 in. (38.087/38.125 mm)

Spring -

No. of coils: 75 1/2 approx.

Free length: 18.687 in. (474.65 mm)
Rate: 36.5 Ib./in. Red paint marked

Steering crown lug and stem

Stem diam. at bearing areas: .9840/.9836in. (24.97/24.96 mm)
Pre 1971 - Head race adjuster nut size: 1.3125/1.3005 in. across flats (33.33/33.03 mm)
Fork tube top nut hexagon size: 1.3125/1.3005 in. (33.33/33.03 mm)
Head bearing spacer length: 5.06 in. (128.5 mm)

Fork leg capacity: 150 cc (5 fl. oz.) each leg
Total fork movement: 6 in. (15.24 cm)

ELECTRICAL

System voltage: 12 volt - Positive earth
Alternator type: RM 21
Rectifier type: 2 DS 506
Zener diode type: Z D 715
Battery type : PUZ5A Lucas

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