BSA D14/4 BANTAM SUPREME D14/4 BANTAM SPORTS Instruction manual

WORKSHOP MANUAL
for D14/4 models
BANTAM SUPREME
BANTAM SPORTS
BUSHMAN
Service Department Telephone [phone]
B.S.A. MOTOR CYCLES LTD. ARMOURY ROAD
BIRMINGHAM 11
Publication Reference 00-4152/4/69

Please Note!
Replacement parts or accessories must be of
B.S.A. origin or as approved by B.S.A Motor
Cycles Ltd.
In this respect your attention is drawn to the
Terms and Conditions of B.S.A. Guarantee.

Page 3

Page 4

Page 5

INTRODUCTION
The object of this manual is to provide comprehensive service information for both the B.S.A. owner, and the workshop
fitter, wishing to carry out either basic maintenance or major repair work. As some of the repair work described requires
specialised skills and workshop equipment, the inexperienced owner is strongly advised to consult his B.S.A. dealer
should he doubt his own ability to carry out a satisfactory job.
This manual is divided into sections, each dealing with a major assembly, and these are sub-divided into the
individual operations required for maintenance or repair. It is hoped that by using this arrangement not only will the
manual be useful to the inexperienced mechanic, but it will also serve as a reference book for the skilled mechanic.
The information given in this manual is correct at the time of publication, but in the course of constant
development it is inevitable that there will be changes in specification. Anyone finding the information given in this
manual to be at variance with the machine in his possession is advised to contact the B.S.A. Motor Cycles Service
Department, where up-to-date information will be provided.
ENGINE AND FRAME NUMBERS
Both the engine and frame numbers, together with prefix and suffix letters, must be quoted in full on any
correspondence relating to the machine or on any enquiry regarding this manual.
The engine number is stamped on top of the crankcase immediately below the cylinder. The frame number is
stamped on the front engine mounting plate.
Page 6

Factory Service Arrangements
(UNITED KINGDOM)
REPLACEMENT PARTS
B.S.A. replacement parts are distributed through a national network of B.S.A. dealers, each of whom holds a stock of
fast moving parts. Approximately 200 of these dealers have been selected for appointment as specialist B.S.A.
replacement part stockists and each of these stockists holds a comprehensive stock of B.S.A. replacements. List of
appointed stockists are available on request, and their names are printed in every B.S.A. parts catalogue.
GUARANTEE CLAIMS
In the interests of all concerned it is best that any owner of a new motor-cycle wishing to claim assistance under the
guarantee should do so through the dealer from whom his machine was purchased. All B.S.A. dealers are familiar with
the procedure designed by B.S.A. to give quick service to any owner of a B.S.A. motor-cycle who may find himself in
difficulty.
REPAIRS
Most appointed B.S.A. dealers are able to carry out major repair work, and owners are asked to make all repair
arrangements through their chosen dealer.
In the great majority of cases local repair will be possible and this will avoid unnecessary expense and
inconvenience, and the possibility of the machine being damaged in transit to or from the works for repair.
Should your B.S.A. dealer decide that Service Department attention is required he will know best how to make
suitable arrangements with the factory. It is important to remember that no machine can be accepted at the works
without a prior appointment. This appointment can be made either by letter or telephone.
Labour time will be greatly reduced if proprietary articles such as legshields, safety bars, carriers or fibre-glass
fairings are removed before handing the machine over for repair. Accessories such as mirrors or badges should always
be removed before entrusting a machine to an independent carrier.
Where parts such as cylinders, petrol tanks etc., are forwarded for repair, they should be packed securely so as to
avoid damage in transit.
All parts sent to the Service Department for repair should be clearly labelled with the owners name and address,
and should have attached a label giving full instructions.
TECHNICAL ADVICE
B.S.A. Service Department staff have long experience in dealing with technical problems of all kinds and will be
pleased to help in the event of difficulty. The correct address of the service department is as follows:—
B.S.A. MOTOR CYCLES LIMITED,
SERVICE DEPARTMENT,
ARMOURY ROAD,
BIRMINGHAM 11.
Telephone No. 021-772 2381
In all communications the model must be quoted with full engine
and frame numbers together with all prefix or suffix letters.
SERVICE ARRANGEMENT OVERSEAS
In most markets of the world B.S.A. has an appointed distributor to whom all service enquires should be addressed.
Page 7

PROPRIETARY PARTS
Equipment not of our manufacture, fitted to our motor-cycles, is of the highest quality and is guaranteed by the
manufacturers and not by us. Any complaints or repairs should be sent to the manufacturer concerned or their accredited
agents who will give every possible assistance. The following are the manufacturers concerned:—
CARBURETTERS Amal Limited,
Holdford Road,
Witton,
BIRMINGHAM 6.
CHAINS Renold Chains Limited,
Wythenshawe,
MANCHESTER.
ELECTRICAL EQUIPMENT Wipac Group Sales Limited,
London Road,
BUCKINGHAM.
Joseph Lucas Limited,
Gt. Hampton Street,
BIRMINGHAM 18.
REAR DAMPERS Girling Limited,
Birmingham Road,
WEST BROMWICH, Staffs.
SPARK PLUGS Champion Sparking Plug Co. Ltd.,
Feltham,
MIDDLESEX.
SPEEDOMETERS Smith's Motor Accessories Limited,
Cricklewood Works,
LONDON N.W.2.
TYRES Dunlop Company Limited,
Fort Dunlop,
BIRMINGHAM 24.
Page 8

U.S.A. SERVICE ARRANGEMENT
REPLACEMENT PARTS
B.S.A. replacement parts are available through a national network of B.S.A. dealers covering the entire United States.
These B.S.A. motor-cycle dealers are listed under "Motorcycles" in the yellow pages of your local telephone
directory.
All requests for parts must be made through franchised B.S.A. dealers, they are not sold directly to B.S.A. by the
two factory branches.
GUARANTEE CLAIMS
In the interest of all concerned the owner of a new motor-cycle wishing to claim assistance under the guarantee must do
so through the dealer from whom his machine was purchased.
REPAIRS
B.S.A. dealers are capable of servicing and repairing B.S.A. motor-cycles, ask your dealer to help when repairs are
needed.
Labour time will be greatly reduced if proprietary articles, such as legshields, crash bars, carriers or fibre-glass
fairings, are removed before handing the machine over for repair. Accessories, such as mirrors or badges, should
always be removed before entrusting a machine to an independent carrier.
TECHNICAL ADVICE
The B.S.A. Service Department staff at the two U.S.A. factory branches are experienced in dealing with technical
questions of all kinds and will be pleased to help in the event of difficulty.
The factory branch addresses are shown below:—
EASTERN: B.S.A. INCORPORATED,
639 Passaic Avenue,
Nutley,
NEW JERSEY 07110
WESTERN: B.S.A. MOTORCYCLES—WESTERN,
2745 E. Huntington Drive,
Duarte,
CALIFORNIA 91010
In all communications the full engine and frame numbers with all prefix and suffix letters and figures must be
quoted as well as the year and model of motor-cycle in question.
Page 9

CONTENTS
Section Page
GENERAL DATA . . . . . . . . . . . . . . . . GD . . 1 to 10
LUBRICATION . . . . . . . . . . . . . . . . A . . 1 to 6
ENGINE . . . . . . . . . . . . . . . . . . B . . 1 to 19
CARBURETTER . . . . . . . . . . . . . . . . C . . 1 to 8
FRAME AND FITTINGS . . . . . . . . . . . . . . D . . 1 to 12
FRONT FORKS . . . . . . . . . . . . . . . . E . . 1 to 9
WHEELS, BRAKES AND TYRES . . . . . . . . . . . . F . . 1 to 12
ELECTRICAL EQUIPMENT . . . . . . . . . . . . . . G . . 1 to 15
CHAINS . . . . . . . . . . . . . . . . . . H . . 1 to 3
TORQUE WRENCH SETTINGS . . . . . . . . . . . . J . . 1
SERVICING TOOLS . . . . . . . . . . . . . . . . K . . 1 to 4
CONVERSION TABLES . . . . . . . . . . . . . . L . . 1 to 10
Page 10

D14/4 GENERAL DATA GD1
I N D E X
SUPREME MODELS
ENGINE:
Piston . . . . . . . . . . . . . . . . . . . . GD3
Piston Rings . . . . . . . . . . . . . . . . . . GD3
Cylinder Barrel . . . . . . . . . . . . . . . . . . GD3
Ignition Timing . . . . . . . . . . . . . . . . . . GD3
Carburetter . . . . . . . . . . . . . . . . . . GD3
Bearing Dimensions . . . . . . . . . . . . . . . . GD4
TRANSMISSION:
Clutch . . . . . . . . . . . . . . . . . . . . GD4
Sprockets . . . . . . . . . . . . . . . . . . GD4
Chain Size . . . . . . . . . . . . . . . . . . GD4
Gear Ratios . . . . . . . . . . . . . . . . . . GD5
FRAME AND FITTINGS:
Front Forks . . . . . . . . . . . . . . . . . . GD5
Rear Dampers . . . . . . . . . . . . . . . . . . GD5
Swinging Arm . . . . . . . . . . . . . . . . . . GD5
Bushes . . . . . . . . . . . . . . . . . . . . GD5
WHEELS, BRAKES AND TYRES:
Wheels . . . . . . . . . . . . . . . . . . . . GD6
Wheel Bearings . . . . . . . . . . . . . . . . . . GD6
Brakes . . . . . . . . . . . . . . . . . . . . GD6
Tyres . . . . . . . . . . . . . . . . . . . . GD6
ELECTRICAL EQUIPMENT . . . . . . . . . . . . . . GD6
CAPACITIES . . . . . . . . . . . . . . . . . . GD7
BASIC DIMENSIONS . . . . . . . . . . . . . . . . GD7
WEIGHTS . . . . . . . . . . . . . . . . . . . . GD7
P
a
g
e

D14/4 GENERAL DATA GD2
INDEX– continued
Page
SPORTS MODELS
ENGINE:
Carburetter . . . . . . . . . . . . . . . . . . GD8
FRONT FORKS:
Bushes . . . . . . . . . . . . . . . . . . . . GD8
WHEELS . . . . . . . . . . . . . . . . . . . . GD8
BASIC DIMENSIONS . . . . . . . . . . . . . . . . GD8
WEIGHT . . . . . . . . . . . . . . . . . . . . GD8
BUSHMAN MODELS
ENGINE:
Bearing Dimensions . . . . . . . . . . . . . . . . GD9
Forks . . . . . . . . . . . . . . . . . . . . GD9
Carburetter . . . . . . . . . . . . . . . . . . GD9
TRANSMISSION:
Gear Ratios . . . . . . . . . . . . . . . . . . GD9
Chain Sizes . . . . . . . . . . . . . . . . . . GD9
BUSHMAN PASTORAL MODELS
TRANSMISSION:
Gear Ratios . . . . . . . . . . . . . . . . . . GD9
Sprockets . . . . . . . . . . . . . . . . . . GD9
Chain Sizes . . . . . . . . . . . . . . . . . . GD9
WHEELS, BRAKES AND TYRES:
Wheels . . . . . . . . . . . . . . . . . . . . GD9
Tyres . . . . . . . . . . . . . . . . . . . . GD10
ELECTRICAL EQUIPMENT . . . . . . . . . . . . . . GD10
BASIC DIMENSIONS . . . . . . . . . . . . . . . . GD10
WEIGHTS . . . . . . . . . . . . . . . . . . . . GD10

D14/4 GENERAL DATA GD3
ENGINE
PISTON
Material. . . . . . . . . . . . "Lo-ex" aluminium
Compression ratio . . . . . . . . 10 : 1
Clearance (bottom of skirt) . . . . . . 0·0038—0·0039" (0·096—0·099 mm.)
Clearance (top of skirt) . . . . . . . . 0·0077—0·0078" (0·195—0·198 mm.)
(both measured on major axis)
PISTON RINGS
Material. . . . . . . . . . . . Cast-Iron
Width . . . . . . . . . . . . 0·097—0·102" (2·463—2·590 mm.)
Depth . . . . . . . . . . . . 0·0615—0·0625" (1·562—1·587 mm.)
Clearance in groove . . . . . . . . 0·0025" (0·0635 mm.)
Fitted gap (maximum) . . . . . . . . ·013" (·3302 mm.)
Fitted gap (minimum) . . . . . . . . ·009" (·2286 mm.)
CYLINDER BARREL
Material. . . . . . . . . . . . Close-grained cylinder iron
Bore size (standard) . . . . . . . . 61·5 mm.
Stroke . . . . . . . . . . . . 58 mm.
Oversizes . . . . . . . . . . ·020" & ·040" (·508 mm. & 1·016 mm.)
Inlet port size . . . . . . . . . . 1" (25·4 mm.)
Exhaust port size . . . . . . . .
. .
1¼" (32 mm.)
IGNITION TIMING (Fixed)
Crankshaft (before top dead centre) . . . . 16·5º
Piston (before top dead centre) . . . . . . 0·060" (1·524 mm.)
CARBURETTER (Concentric)
Type . . . . . . . . . . . . Amal R626/12
Main jet. . . . . . . . . . . . 160
Pilot jet . . . . . . . . . . . . 25
Needle jet size . . . . . . . . . . ·105" (2·667 mm.)
Needle position . . . . . . . . . . 3
Throttle valve . . . . . . . . . . 3
Nominal choke size . . . . . . . . 26 mm.
Throttle slide return spring (free length) . . . . 3-1/16" (78 mm.)

D14/4 GENERAL DATA GD4
BEARING DIMENSIONS
Crankshaft bearing (left- and right-hand) . . . . ·75 × 1·875 × ·5625"
(19·05 × 47·625 × 14·2875 mm.)
Crankshaft bearing outer (right-hand) . . . . 17 × 40 × 12 mm.
Layshaft bush, left- and right-hand (bore) . . . . ·6105—·6115" (15·507—15·532 mm.)
Gearbox sleeve pinion bearing . . . . . . ·875 × 1·875 × ·375"
(22·225 × 47·625 × 9·525 mm.)
Mainshaft final drive gear bush (bore) . . . . ·4965—·4975" (12·611—12·636 mm.)
Mainshaft diameter (gear-side) . . . . . . ·6247—·6250" (15·867—15·944 mm.)
Mainshaft diameter (drive-side) . . . . . . ·498—·499" (12·649—12·675 mm.)
Layshaft diameter (left- and right-hand) . . . . ·6095—·6100" (15·481—15·608 mm.)
Gearbox mainshaft bearing . . . . . . ·625 × 1·5625 × ·4735"
(15·875 × 39·6875 × 11·1125 mm.)
Big-end roller (18) . . . . . . . . 4 × 8 mm.
Small-end bearing . . . . . . . . ·5625 × ·75 × ·625"
(14·2875 × 19·05 × 15·875 mm.)
Gudgeon pin diameter . . . . . . . . ·5617—·5620" (14·267—14·275 mm.)
TRANSMISSION
CLUTCH
Type . . . . . . . . . . . . Multi-plate
Number of plates . . . . . . . .
. . 7
Driving (bonded segments) . . . . . . 4
Driven (plain) . . . . . . . . . . 3
Overall thickness of driving plates and segments . . ⅛"(3mm.)
Clutch springs . . . . . . . . . . 6
Free length of springs . . . . . . . . 1-9/64" (29 mm.)
Clutch push rod, short (length) . . . . . . 1·998—2·002" (50·75—50·85 mm.)
Clutch push rod, short (diameter) . . . . . . ·186—·188" (4·7244—4·7752 mm.)
Clutch push rod, long (length) . . . . . . 5·778—5·782" (146·76—146·86 mm.)
Clutch push rod, long (diameter) . . . . . . ·180—·182" (4·57—4·62 mm.)
SPROCKETS
Engine . . . . . . . . . . . . 17 teeth
Clutch . . . . . . . . . . . . 38 teeth
Gearbox . . . . . . . . . .
. . 16 teeth
Rear wheel . . . . . . . . . . 47 teeth
CHAIN SIZE
. . . . . . . . . . 0·500 × 0·205 × 120 links

D14/4 GENERAL DATA GD5
GEAR RATIOS
Gearbox—(top) . . . . . . . . . . 1·0 :1
—(third) . . . . . . . .
. . 1·301 :1
—(second) . . . . . . . . 1·831 :1
—(first) . . . . . . . . . . 2·843 :1
Overall —(top) . . . . . . . . . . 6·57 :1
—(third) . . . . . . . .
. . 8·55 :1
—(second) . . . . . . . . 12·03 :1
—(first) . . . . . . . . . . 18·68 :1
FRAME AND FITTINGS
FRONT FORKS
Type . . . . . . . . . . . . Coil spring, hydraulically-damped
Springs:
(free length) . . . . . . . . . . 17¼" (43.8 cm.)
(spring rate) . . . . . . . . . . 35 lb./in.
(number of coils) . . . . . . . . 82
Shaft diameter (top) . . . . . . . . 1·045—1·046" (26·543—26·568 mm.)
Shaft diameter (base) . . . . . . . . 1·000—1·001" (25·4—25·425 mm.)
Sliding tube bore . . . . . . . .
. . 1·125—1·129" (28·575—28·677 mm.)
Upper bush (outer diameter) . . . . . . 1·121—1·122" (28·473—28·499 mm.)
Upper bush (bore) . . . . . . . . 1·058—1·059" (26·873—26·899 mm.)
Working clearance . . . . . . . . 0·013" (0·330 mm.)
Lower bush (outer diameter) . . . . . . 1·118—1·119" (28·397—28·425 mm.)
Lower bush (bore) . . . . . . . . 1·000—1·001" (25·4—25·425 mm.)
Working clearance . . . . . . . . 0·006—0·011" (0·152—0·279 mm.)
Length (upper and lower) . . . . . .
. . 1" (25·4 mm.)
REAR DAMPERS
Type . . . . . . . . . . . . Coil spring, hydraulically-damped
Springs:
(fitted length) . . . . . . . . 5·7" (144·78 mm.)
(spring rate) . . . . . . . . . . 100 lb./in.
(colour identification) . . . . . .
. . Yellow/tan
SWINGING ARM
Bush material . . . . . . . . . . Phosphor-bronze
Bush (outside diameter) . . . . . . . . ·993—·994" (25·22—25·24 mm.)
Bush (bore) . . . . . . . . . . ·860—·865" (21·84—21·97 mm.)
Housing diameter . . . . . . . .
. . ·990—·991" (25·14—25·17 mm.)
Interference fit on spindle . . . . . .
. . ·0085—·014" (·215—·355 mm.)
Spindle diameter . . . . . . . .
. . ·8735—·8740" (22·187—22·200 mm.)

D14/4 GENERAL DATA GD6
WHEELS, BRAKES AND TYRES
WHEELS
Rim size and type (front and rear) . . . .
. . WM1-18
Spoke sizes:
(front, left-hand) . . . . . . . . 12 s.w.g. × 8-1/16" (2·641 × 204·78 mm.)
(front, right-hand, inner) . . . . . . 12 s.w.g. × 6½" (2·641 × 165·1 mm.)
(front, right-hand, outer) . . . . . . 12 s.w.g. × 6-9/16" (2·641 × 166·69 mm.)
(rear, right-hand) . . . . . . . . 10 s.w.g. × 7-5/16" (3·251 × 201·612 mm.)
(rear, left-hand, inner) . . . . . .
. . 10 s.w.g. × 6½" (3·251 × 165·1 mm.)
(rear, left-hand, outer) . . . . . .
. . 10 s.w.g. × 6½" (3·251 × 165·1 mm.)
WHEEL BEARINGS
Front:
(left-hand) . . . . . . . . . . 15 × 35 × 11 mm.
(right-hand) . . . . . . . . . . 17 × 40 × 12 mm.
Spindle diameter (at ground portions):
(right-hand) . . . . . . . . . . ·6687—·6692" (16·985—16·998 mm.)
(left-hand) . . . . . . . . . . ·5899—·5904" (14·9835—14·9962 mm.)
Rear:
(left- and right-hand) . . . . . . . . 17 × 40 × 12 mm.
Spindle diameter (at ground portions): . .
. . ·6687—·6692" (16·985—16·998 mm.)
BRAKES
Front and rear (diameter) . . . . . .
. . 5½" (139·7 mm.)
Front and rear (width) . . . . . . . . 1" (25·4 mm.)
Lining thickness . . . . . . . . . . 5/32" (·4 mm.)
Total lining area (front and rear) . . . . . . 20 sq. in. (129 sq. cm.)
TYRES
Size (front and rear) . . . . . . . . 3·00 × 18"
Pressure (front) . . . . . . . . . . 17 p.s.i. (1·2 atm)
Pressure (rear) . . . . . . . . . . 22 p.s.i. (1·5 atm)
(see also page F12)
ELECTRICAL EQUIPMENT (6 volt)
Battery . . . . . . . . . . . . Lucas 6 volt PUZ5E/11
Alternator type . . . . . . . . . . Wipac 1G1768
Contact breaker unit . . . . . . . . Wipac S0584
Ignition coil . . . . . . . . . . Wipac S0769
Rectifier . . . . . . . . . .
. . Wipac S2642
Bulbs:
(headlight, main) . . . . . . . . 30/24 watt pre-focus
(headlight, pilot) . . . . . . . . 3 watt M.E.S.
(stop/tail light) . . . . . . . . 6/18 watt S.B.C. staggered pin
(speedometer light) . . . . . . . . 0·6 watt B.A. 7S lug cap
Horn . . . . . . . . . . . . Clearhooter HF900

D14/4 GENERAL DATA GD7
CAPACITIES
Petroil proportion . . . . . . . .
. .
See page A3
Fuel tank . . . . . . . . . . 1·875 gallons or
2·25 U.S. gallons
(8·5 litre)
Gearbox . . . . . . . . . .
. .
¾-pint (0·5 litre)
Front fork (each leg) . . . . . . . . ⅛-pint (0·07 litre)
BASIC DIMENSIONS
Wheelbase . . . . . . . . . . 50·0" (127 cm.)
Overall length . . . . . . . . . . 77·5" (196·85 cm.)
Handlebar width. . . . . . . . . . 27·75" (70·49 cm.)
Seat height (unladen) . . . . . . . . 31" (78·74 cm.)
Overall height (approximate) . . . . . . 40·0" (101·6 cm.)
Ground clearance . . . . . . . .
. .
6·75" (17·15 cm.)
WEIGHTS
Machine (unladen) . . . . . . . . 215 lbs. (97·5 kg.)
Engine/gearbox unit (less carburetter) . . . . 51 lbs. (23 kg.)

D14/4 GENERAL DATA GD8
D14 BANTAM SPORTS MODELS
All general data is the same as that given in preceding pages
for the Supreme models except for the following:—
CARBURETTER
. . . . . . . . . . Concentric R626/13
FRONT FORKS
Shaft diameter . . . . . . . . . . 1·248—1·249" (31·70—31·72 mm.)
Sliding tube bore . . . . . . . .
. . 1·475—1·477" (37·46—37·51 mm.)
BUSHES
Upper bush (outside diameter) . . . . . . 1·4750—1·4755" (37·465—37·477 mm.)
Upper bush (bore) . . . . . . . . 1·250—1·251" (31·750—31·775 mm.)
Working clearance . . . . . . . . 0·001—0·003" (0·025—0·076 mm.)
Length . . . . . . . . . . . . 2⅛" overall (28·5 mm.)
Lower bush (outside diameter) . . . . . . 1·473—1·474" (37·44—37·41 mm.)
Lower bush (bore) . . . . . . . . 1·2485—1·2495" (31·714—31·737 mm.)
Working clearance . . . . . . . . 0·001—0·004" (0·025—0·102 mm.)
Length . . . . . . . . . . . . 1¼" overall (31·75 mm.)
WHEELS
Spoke sizes:
(front, left-hand) . . . . . . . . 12 s.w.g. × 6-21/32" (2·641 × 169·069 mm.)
(rear, right-hand) . . . . . . . . 10 s.w.g. × 6-9/16" (3·251 × 166·687 mm.)
BASIC DIMENSIONS
Seat height (unladen) . . . . . . . . 30·5" (77·47 cm.)
Handlebar width. . . . . . . . . . 23" (58·42 cm.)
Overall height (approximate) . . . . . . 37·5" (95·25 cm.)
WEIGHT
Weight . . . . . . . . . . . . 221 lbs. (100·24 kg.)
CAPACITY
Front forks (each leg) . . . . . . . . ⅓pint (0·175 litre)

D14/4 GENERAL DATA GD9
D14 BUSHMAN MODELS
All general data is the same as that given in preceding pages
for the Supreme models except for the following:—
BEARING DIMENSIONS
Forks . . . . . . . . . . . . As Bantam Sports models
CARBURETTERS (Concentric)
Type . . . . . . . . . . . . Amal R626/12
TRANSMISSION
(Standard D14 Bushman models)
GEAR RATIOS
. . . . . . . . As Bantam Supreme models
CHAIN SIZES
Transmission . . . . . . . . ·500 × 0·205" × 120 links
TRANSMISSION
(D14 Bushman Pastoral models)
GEAR RATIOS
Gearbox . . . . . . . . . . As Bantam Supreme models
Overall—(top) . . . . . . . . . . 8·10 :1
—(third) . . . . . . . . 10·54 :1
—(second) . . . . . . . . 14·83 :1
—(first) . . . . . . . . . . 23·03 :1
SPROCKETS
Rear wheel . . . . . . . . 58 teeth
CHAIN SIZES
Transmission . . . . . . . . . . ·500 × 0·205" × 126 links
WHEELS, BRAKES AND TYRES
WHEELS
Rim size and type (front) . . . . . . WM1-19
Rim size and type (rear) . . . . . . . . WM2-19
Spoke size:
(front, left-hand) . . . . . . . . 12 s.w.g. × 8⅞" (2·641 × 225·42 mm.)
(front, right-hand, inner) . . . . . . 12 s.w.g. × 7-1/16" (2·641 × 179·38 mm.)
(front, right-hand, outer) . . . . . . 12 s.w.g. × 7" (2·641 × 177·8 mm.)
(rear, left-hand) . . . . . . . . 10 s.w.g. × 6-29/32" (3·251 × 175·42 mm.)
(rear, right-hand) . . . . . . . . 10 s.w.g. × 8¾" (3·251 × 222·25 mm.)

D14/4 GENERAL DATA GD10
TYRES
Size (front and rear) . . . . . . . . 3·00 × 19"
Pressure (front) . . . . . . . . . . 17 p.s.i. (1·2 atm)
Pressure (rear) . . . . . . . . . . 22 p.s.i. (1·5 atm)
ELECTRICAL EQUIPMENT (Direct Lighting)
Alternator type . . . . . . . . . . Wipac 1G1791
Contact breaker unit . . . . . . . . Wipac S0584
Ignition coil . . . . . . . . . . Lucas 3E.T.
Bulbs (headlight, main) . . . . . . . . 24/24 watt pre-focus
(The battery, rectifier, headlight pilot bulb
and horn are not fitted to these models)
BASIC DIMENSIONS
Overall length . . . . . . . . . . 78" (198 cm.)
Handlebar width. . . . . . . . . . 28·5" (72 cm.)
Seat height (unladen) . . . . . . . . 30·5" (77·5 cm.)
Ground clearance . . . . . . . . 10" (25 cm.)
Overall height (approximate) . . . . . . 40·5" (103 cm.)
WEIGHT
Machine (unladen) . . . . . . . . 222 lbs. (100·5 kg.)