ABROAD, taking machine, 64 Absorber, shock, 5 Accident, what to do in case of, 58 Accumulators, care of, 152 Address, refusing, 59 Adjustable saddle, 3 Advance and retard, object of, 72 -, use of, 43, 45 Air intake, petrol spraying from, 104 -, leaks, 104, 132 -, lock, 133 -, vent in tank choked, 103 A.J.S. series, 1-27 Alining rear wheel, 149 -, sidecar, 151 All weather riding, 63 Aluminium cylinder head, 20 Amal carburettor, 10, 79, 129 Appeal, right of, 60 Approach, warning of, 32 Arrest, 59 Assembly of engine, 122 -, flywheel, 134 Atomization, 72, 75 Auto-Cycle Union, 35 Automobile Association and Motor Union, 35

BATTERY, 152 Big end, 8, 86 Bowden carburettor, 82 Brake adjustments 150 -, ratchet, 150 Brakes, 13, 26 Bush, small-end, fitting, 134 Buying new machine, 28 CABLE, high tension, defective, 101 -, ignition, broken, 102 Cables, control, defective, 103 Cam-ring, 78 Camshaft engine, 114 -, models, see Preface, 27

Carbon brush, defective, 101 -, deposits, 113 -, removing from engine, 117 Carborundum, 119 Carburettor, Amal, 79, 129 -, float punctured, 102 -, jet choked, 102 , principle of, 73-76 -, slides sticking, 103 -, troubles, 102 -, tuning. 129 "Certificate," insurance, 32 Chain, coupling up, 143 -, front, adjusting, 134 guard, removing, 142 -, magneto, adjustment, 128 -, rear, adjusting, 141 -, repairs, 143 Chains, care of, 143 Change speed lever, 39, 41 Changing gear, 44 Choked jet, 102 -, petrol pipe, 103 Cleaning the machine, 111 Clearance, valve, 111 Clothes for touring, 62 Club, joining, 34 Clubs— - Auto-Cycle Union, 35 - Automobile Association and Motor Union, 35 - Royal Automobile Club, 35 Clutch, 137, 143 -, attention to, 140 -, dismantling, 141 -, parts, 143 -, slip, 140 -, use of, 44

Coasting, 51 Combination, cornering on, 49 Competition model, 35 Competition riding, 151 Compression, absence of after valve grinding, 132 -, maintaining, 128

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Compression, poor, causes of, 105 -, stroke, 72 -, ratios, 17 Condenser, 78 -, broken down, 101 Connecting-rod bearings, 8 Connecting-rod, mounting on 9.90 h.p. engine, 22 Consumption, petrol, 62 -, oil, 62 Contact-breaker, periodical attention to, 123 -, points, bad condition of, 100 -, insulated, 100 -, loose, 100 -, rocker arm sticking 100 -, spring broken, 100 -, weak, 101 Continental rules of the road, 65 -, touring, 64 Controlling speed, 47 Controls, engine, 40 of the A.J.S., 41 Corner sign, 56 Cornering, 48 Corners and cross-roads, 48 Cost of garaging, 62 -, of licences, 611 -, of machine, 1, 61 Costs, running, 61 Countershaft gear, 40 Courtesy on road, 57 Crankcase, cleaning out, 123 - hot, 105 Crossed wires, 101 Cross-roads and corners, 48 Cruising speed, 47 Cush drive, 5 -, purpose of, 5

Cut-out, exhaust, 59 Cutting-in, 55 Cylinder, aluminium, 20 -, cleaning outside of, 121 -, head, removing, 115 -, removal of, 115 DANGEROUS corner sign, 56 Dangers, road, 54 Dazzle, 56

Decarbonizing engine, 113 Delivery of machine, 28 Depreciation, 61 Detachable head, removing, wheels, 4, 146 Dismantling clutch, 141 -, engine, 113 -, gear-box, 138 -, O.H.V. mechanism, 115 Distributor, 78 Draining crankcase, 123 -, tank. 123 Dress, choice of, 62 Drive, cush, 5 Driving, 30 -, careless, 54 -, dangerous, 54 -, hints, 52-54 -, in fog, 57 -, in traffic, 54 -, licence, 30

Drysump lubrication, 88

ELECTRIC sets, 2, 152 Endorsement of licence, 59 Engine, 3.49 h.p. S.V., 18 -, 3.49 h.p. O.H.V., 7-10 -, 4.98 h.p. O.H.V., 16 -, 9-90 h.p. S.V. twin, see Preface, 21 -, Big Port, 6 -, controls, 40 -, cooling, 47 -, decarbonizing, 113 -, elements of, 67 four-stroke cycle, 71 -, how it works, 67 -, lubrication, 37, 123 -, insufficient, 105 -, overhead camshaft, 114 -, overhead valve, 3, 9 -, procedure after starting. 44 -, reassembly, 122 -, revolutions, 42 -, running-in, 46 -, runs badly, 108 -, side-valve, 18-26 -, starting, 42 -, stops, 107, 108 -, testing, 128 -, timing, 128 Page 157 Engine troubles, 99-108 -, tuning for speed, 151 -, twin cylinder, synchronizing, 132 -, dismantling, 115 -, valve timings, 74 Excise licence, 29 Exhaust cut-out, 59 -, lifter, abuse of, 47 -, adjustment 122 -, noise, 7 -, stroke, 73 -, valve, burning of, 73 -, cleaning dirty, 132 -, colour of, 120 -, stuck open, 105 Expenses, 61 FAULTS, locating, 99 Firing stroke, 72 Float, carburettor punctured, 102 Flywheel, function of, 68 Flywheels, assembling, 134 Fog, 57 Footboards, 26 Footrests, pillion, 66 Forks, 146 ; adjustments to, 145 Four-stroke engine, elements of, 67-79 -, principle of, 70 Four-speed gear-box, 93 GARAGE fees, 62 Garaging, 62 Gauge, tyre, 46 -, alinement, 149 Gear changing, 45 -, for starting, 44 -, quadrant, 411 -, three-speed countershaft, 97 , timing, 23, 127 Gear-box and clutch, use of, 45 -, attention to, 134 -, dismantling 136 -, function of, 40 Gear ratios. See specifications in Chapter I Gears for hill climbs, 52 Gloves, 63 Gradients, ascending of, 51 Grease-gun lubrication, 121 Gudgeon pin bearing, loose, 105 -, removal of, 116 Guides, valve, 8 Gummed-up piston, 104 HAND signalling, 51 Handle-bar controls, 41 Handling petrol pipes, 133 Head, steering, play in, 145 Headgear, 63 Helmets, 63 High tension cable, defective, 101 -, magneto, 76 Hill climbing, 51 -, coasting down, 51 Horns, 33 Horse-power, 42 Horses, passing, 50 IGNITION advance. See specs, Chap. I -, cable broken, 102 -, timing, 124 -, troubles, 99 Illumination, law regarding, 59, 33, Induction stroke, 71 Inflation, tyre, 46 Insulation, magneto, broken down 101 Insurance, 31 -, certificate, 32 Intake, air, petrol spraying from, 104 International marks, 66 -, travelling passes, 64 Itineraries, 64 JET, choked, 102 -, level of petrol at, 75 -, pilot, 80, 84 -, wrong size, 102 Joints, making, 128 -, making washers for, 133 KICK-STARTER, using, 43 Knocking, 44 LAMPS, 33 -, maintenance of, 152 Leakage of high tension cable, 101