BSA D1 125 c.c. Bantam Instruction Manual Download Page 33

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Summary of Contents for D1 125 c.c. Bantam

Page 1: ...00 4036 Instruction Manual Models D1 125 c c Bantam D3 150 c c Bantam Major D5 150 c c Bantam Major...

Page 2: ...major overhauls but if any owner feels he is competent to carry out this type of work a service manual and an illustrated priced spares catalogue for this machine can be obtained from his B S A spare...

Page 3: ...FIG 1 The Controls 3...

Page 4: ...ARBOX HUBS IGNITION TIMING LUBRICATION CHART LUBRICATION SYSTEM ROUTINE MAINTENANCE REAR SUSPENSION RUNNING IN SPARKING PLUG STEERING HEAD TECHNICAL DATA TRANSMISSION WHEEL REMOVAL FRONT WHEEL REMOVAL...

Page 5: ...Gear ratios top second first Clutch friction plates Chain size and pitch front 250 in rear 335 in Teeth on engine sprocket gearbox sprocket clutch sprocket rear chainwheel 7 0 11 7 22 0 3 50 117 17 1...

Page 6: ...ght handlebar it controls the throttle opening To open the throttle i e to increase the engine speed turn the grip so that the top moves towards the rider Full movement is about a quarter of a turn Fr...

Page 7: ...the bottom fork yoke To operate the lock turn the forks to the left then turn the key in the lock to release the plunger This prevents the machine being driven or wheeled DRIVING To Start the Engine...

Page 8: ...pply them smoothly and progressively Try to anticipate the need to change gear or to brake so that your riding is not jerky or untidy Maintain a natural riding position as this provides maximum contro...

Page 9: ...tion will serve as a guide to the periods between servicing and the method of carrying out the various adjustments will be found under the appropriate headings in the later chapters Weekly Check tyre...

Page 10: ...roughly to ensure correct mixing of the two liquids If this is not done there is a risk of liquid oil undiluted with petrol reaching the carburetter and clogging the fuel supply system As the only lub...

Page 11: ...e running of the engine Ignition timing model D5 Piston position of this model is 1 16 in before top dead centre FIG 2 Contact Breaker DECARBONISATION Decarbonising is extremely simple and should be c...

Page 12: ...lts are unscrewed so that the tank can be raised slightly Take care when removing the barrel to support the piston as it emerges from the end of the bore in order that it may not be damaged as it fall...

Page 13: ...t first putting a smear of oil on the gudgeon pin not forgetting a new circlip to replace the one which was removed THE PISTON MUST BE REPLACED IN ITS ORIGINAL POSITION I E WITH PISTON RING GAPS TOWAR...

Page 14: ...less it becomes absolutely necessary Reassembly Before attempting to replace the cylinder barrel over the piston smear the latter generously with engine oil and then place it over the piston carefully...

Page 15: ...The sparking plug Remove the sparking plug every 1 000 miles 1 500 Km or so for inspection If the carburation system is in correct adjustment the sparking plug points should remain clean almost indef...

Page 16: ...ig 5 NEVER ATTEMPT TO MOVE THE CENTRE ELECTRODE and it is always advisable to use the special plug gap tool illustrated obtainable at 2 from any Champion Plug stockist or from the Champion Sparking Pl...

Page 17: ...nkcase and when this occurs starting is quite impossible until it is drained away by the removal of the crankcase drain plug which is the smaller of the two plugs under the crankcase Air Cleaner This...

Page 18: ...half filler cap measures to each gallon of petrol OIL BRAND ENGINE GEARBOX GREASE POINTS WAKEFIELD Castrol Two Stroke Oil 1 16 Or Castrol XXL Castrol XXL Castrolease Heavy SHELL 2T Petroiler Mix or 2T...

Page 19: ...eering head Fork legs Clutch operation Speedometer drive Rear suspension units plunger Contact breaker cam pad 9 9 9 9 9 9 9 A FEW DROPS OF ENGINE OIL NO PART PAGES 10 11 12 13 14 Saddle nose bolt exc...

Page 20: ...utch adjustment will be found at the left hand end of the gearbox mainshaft see Fig 8 and it consists of an adjusting pin C screwed into the clutch withdrawal quick thread sleeve and a locknut B to se...

Page 21: ...rew it half a turn and holding it in this position retighten the locknut If the adjustment is correctly made in this manner it will be found that there is a small amount of free play at the clutch lev...

Page 22: ...evel of dipstick WHEELS Hub Lubrication Inject grease through the nipples in the centres of the hubs Do not over lubricate or grease may be forced onto the brake linings and cause ineffective brakes T...

Page 23: ...rame models and in for swinging arm frame models Make sure that the wheel is hard up against the adjusters when checking and also that the adjustment is equal on both sides of the wheel so that the la...

Page 24: ...will stand below the lining surface this is important since the rivets will otherwise score the brake drum Insert the rivets into the holes and rivet them over on the inside of the shoe This is easily...

Page 25: ...lb horn unscrew this item and lift off the steering head dust cover On other machines the dust cover is held in position by a central screw FIG 10 Front fork and steering head D1 Model only Slacken th...

Page 26: ...e pinch bolts A and B FIG 11 Rear suspension unit D1 The central columns of the suspension units can then be tapped out from underneath and withdrawn through the top lugs When this is done the remaind...

Page 27: ...function of the alternator and rectifier to maintain the battery in a charged state for all load conditions This is accomplished by a system of coil switching which adjusts the generator output accor...

Page 28: ...ich previously went to the battery must be insulated and the stop light must be disconnected If this is not done the rectifier may be seriously damaged The machine must only be run without a battery i...

Page 29: ...on to the exposed thread AS FAR AS IT WILL GO Finally turn the central extractor bolt with a suitable spanner until the flywheel is drawn from its taper Electric Horn The horn is adjusted at the Work...

Page 30: ...A single bulb is used with direct lighting sets plus two screw in stop light bulbs with battery sets The transparent red plastic portion of the lamp can be removed by unscrewing the two countersunk s...

Page 31: ...F IG 13 Wiring diagram direct lighting 31...

Page 32: ...F IG 14 Wiring diagram battery lighting 32 www ClassicCycles org...

Page 33: ...PARTS ACCESSORIES Click on links below OEM parts online schematics EU OEM parts online schematics US Shop Revzilla for the latest in Motorcycle Accessories Save Up to 45 on Motorcycle Tires J P Cycle...

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