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BSA WDM20 - Page 2

BSA WDM20
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INDEX – GENERAL
Pages Pages
Brakes 28 Front Forks 23
Carburetter 10 Gearbox and Gearchange 25
Clutch 21 Hubs 27
Charging System 36 Ignition System 32
Electrical Wiring System 30-31 Lighting and Accessories 42
Engine Adjustments 8 Lubrication System 3
Engine – Complete dismantling 12 Lubrication Chart 4-5
Engine – Decarbonising 11 Steering Head 28
Engine – re-assembly 16 Transmission 20
Engine – removal from frame 12 Useful Data 2
INDEX – DETAILS
Pages Pages
BRAKES
Ignition System
- continued
Adjustment – Relining 28
Slipping clutch – sparking plug -
CARBURETTER
Suppressor - immobiliser
33
Mixture – Needle position – Pilot adjustment – Re-assembling and testing slipping clutch 35
Throttle stop. 10
Lighting and Accessories
ENGINE ADJUSTMENTS
Headlamp – Tail lamp – Cables - Lighting
Oil-pressure valves – Exhaust valve lifter 8
switch
42
Tappets – Ignition timing 8-9
Horn
43
ENGINE DISMANTLING
Wiring diagrams
30-31
Cylinder head – Cylinder barrel – Valves 6-7
Valve grinding – Valve guides, removal
FRONT FORKS
and replacement 11 Adjustment 28
Piston and Rings – Checking ring gap – Dismantling – fitting new spring – re-assembly 29
removing engine from frame 12
Removing Magdyno pinion 13
GEARBOX
Oil pump, removal and dismantling – Removal – dismantling 23
“Splitting” crankcase – removing Dismantling Gearchange – Re-assembling
Bearings 14 Gearbox 24
Removing cam spindles – dismantling Re-assembling gearchange 25
flywheels – reboring cylinder - fitting Replacing gearbox 26
new cylinder lining. 15
ENGINE RE-ASSEMBLY
HUBS
Flywheel assembly and alignment 16 Rear – adjustment – dismantling and
Replacing oil pump – tappets – replacing Re-assembly 27
bearings – re-assembling crankcase - Front 27-28
Replacing timing gears & magdyno 17
Replacing piston – cylinder barrel - timing
LUBRICATION
Cover – cylinder head – exhaust valve Engine lubricating system 3
lifter – refitting engine in frame. 18 Lubrication chart 4
ELECTRICAL EQUIPMENT
Hubs – Brake cam spindles - Speedometer
Charging System
Drive – Filters – Rear chain – Dynamo -
Dynamo
Gearbox 5
Testing – Removal and Replacement 36 Oil pump – removal – dismantling and
Dismantling – Brushes - Commutator 37 Re-assembly 14
Field coil, testing and removing -
Armature – Bearings 38
TRANSMISSION
Re-assembly 39 Clutch – adjustment 20
Cut-out and Regulator
39 Clutch – dismantling 21
Cleaning contacts – setting regulator - Clutch – re-assembly 22
Cut-out 40 Chaincase - removal 12
Ammeter – Removal and Replacement
41 Chaincase - replacement 18
Battery – Care of 41 Chain adjustment 20
Ignition System
Wheel alignment 21
Magneto lubrication – adjustment – testing -
Cleaning contact breaker – H.T. cable -
SHOCK ABSORBER – Adjustment
28
Pick-up 32
Removal – dismantling – removing and
STEERING HEAD
testing armature 34 Adjustment 28
Re-assembly 35 Dismantling – re-assembly 29
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