MOTO GUZZI 850 GT 1972 Riders Handbook Download Page 78

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Summary of Contents for 850 GT 1972

Page 3: ...Huno DJrezione e Stabilimenti 22054 Mandella dellario Co Telefoni 71112 e 2512 8 linee urbane Telegrammi SEIMM MANDELLOLAAIO Tale J8095 SEIMM MOTO GUZZI C C LA Milano n 722044 Como n 117437 C C Posta...

Page 4: ...ead very carefully as most troubles and failures arising from neglect or poor maintenance will be avoided if all the instructions herein contained are strictly followed Don t forget that aU major over...

Page 5: ...ever Front brake lever Rear brake pedal Side stand Riding instructions Engine starting Caution Starting a hot engine Getting under way and stopping of machine On the way Lubrication and general mainte...

Page 6: ...alves Valve gearing Tappet clearance Checking valve timing Ignition Distributor Spark plugs Checking of ignition timing Checking of ignition advance by stroboscope lamp Adjustments Generator belt Clut...

Page 7: ...o stop and allow the engine to cool down Under no circumstances whatever should the following speeds be exceeded in the running in period Maximum permissible speeds Distance up to 800 kms 500 miles in...

Page 8: ...1 1 Fig 1...

Page 9: ...light 10 Speedometer 11 Ignition key 12 Rev counter 13 Clutch lever 14 Light switch and horn 15 Side stand 16 Rear brake pedal 17 Footrests 18 Center stand 19 Tail light button The machine can also be...

Page 10: ...J JUI SiU J Qj 8...

Page 11: ...9...

Page 12: ...identified with a serial number which is stamped on the frame down and on the left hand side of the crankcase cover This number appears in the conformity certi ficate and is the only one valid to all...

Page 13: ...13 14 mm 13 Wrench open ended 10 11 mm 14 Wrench open ended 7 8 mm 15 Wrench open ended tappet adjusting 16 Allen key 5 hex 17 Pliers universal 18 Screwdriver 19 Wrench ring double 22 27 mm 20 Feeler...

Page 14: ...lure to do this will imply the loss of the right to claim warranty The warranty period shall extend over a period of six months or 10 000 kms which ever OCcurs first from the date of purchase and shal...

Page 15: ...MAIN FEATURES ENGINE See fig 5 1 CYcle Number of cYlinders Cylinder dispOSition Bore StrOke DiSPlacement Fig 5 1 4 strOkes 2 V 90 83 mm 3 26 78 mm 3 07 844 05 cc 51 5 Cu in...

Page 16: ...l with special cast iron inserted seats steel construction in anti friction material pressed in 2 suitable housings steel construction with AL TIN alloy thin wall bearings in light alloy O H V push ro...

Page 17: ...uretor Air intake provided with dry filter Pressure by gear pump driven by the crank shaft Oil strainer in crankcase Normal lubrication pressure 3 8 4 2 kgs sq cm 54 to 60 Ihs sq in controlled by reli...

Page 18: ...ate case bolted on crankcase operated by rocker pedal kom the R H or L H side of the machine Engine gear box ratios to 1 235 17 21l Internal gear ratios low gear to 2 14 28 second gear to 1 388 18 25l...

Page 19: ...ressure should be increased by 0 2 kgs sq cm 2 8 p s i Expanding type 220 mm dia 8 66 Twin leading shoes front brake operated by hand lever on the right handlebar Large rear brake operated on left han...

Page 20: ...d oil capacites Group or part Fuel tank Reserve Sump Transmission Rear drive box bevel set lubrication Front fork dampers each leg 18 Quantity 22 5 liters liters 3 liters 0 750 liters 0 230 liters 0 1...

Page 21: ...r for bat tery charge Should go out when the en gine has reached a certain number of revolutions 4 Orange neutral indicator This will light up when the gearbox is either in neutral or in proximity of...

Page 22: ...he engine with the clutch disengaged 5 Red warning light Oil pressure gauge Will go out when oil pressure for normal engine operation is sufficient 6 Revolution counter This key has 3 positions 0 Mach...

Page 23: ...levers A and B on the left handlebar must be switched on Fig 9 On right handlebar With the ignition key in position 2 the machine is ready to be started Every machine is supplied with an ignition key...

Page 24: ...ion 4 high beam c Horn button Is on left handlebar and should be used for starting and gearshifting only It is located on the right handlebar Throttle is opened by turning toward the rider Is on the r...

Page 25: ...rpose is to make parking easier during brief stops When re starting make always sure that this stand is returned to the rest position as if it is left inadvertently down possible serious trouble may e...

Page 26: ...AFTER FIRST 500 Km 300 Miles EVERY 500 Km 300 Miles EVERY 1000 Km 600 Miles EVERY 3000 Km 2000 Miles EVERY 10 OOO Km 6 000 Miles _ EVERY 20 000 Km 12 000 Miles 2 1 24 t I...

Page 27: ...Fig 11 o Maintenance SHELL Super 100 Multigrade o SHELL Splrax HD 90 o SHELL Alvanla Grease 2 r SHELL Tellus 33 25...

Page 28: ...le for a short while in the hot and a few minutes in the cold season to allow the oil to reach all the lubricating points and the cylinders to get warm N B Do not forget that the easy starting lever m...

Page 29: ...h rapidly but not with a jerk and turn on the gas once more Third and fourth and high gear are likewise enga ged by toe pressure In normal riding conditions all the tell tale lights should be off exce...

Page 30: ...o feel for neutral pOSition With the machine standing still and the en gine running the transmission should always be kept in neutral Do not keep the clutch lever depressed even during the briefest st...

Page 31: ...dipstick See Engine lubri cation 7 Lubricate cable ends See Lubrication of clutch front brake and air cables 8 Replace oil in crankcase See Engine lubrication 9 Check tappet clearance See Tappet clea...

Page 32: ...ator using a clean cloth slightly moistened in petrol See Generator 19 Check condition of wheel bearings and pack them with grease See lubrlcatlon of wheel bearings 20 Check condition of steering bear...

Page 33: ...rect oil level is in between the minimum and maximum marks Make this check on a warm engine with the filler cap screwed on one turn Every 3000 kms 1800 miles change the engine oil on a new or overhaul...

Page 34: ...e or an equivalent Under no circumstances should this valve be tampered with as it has already been calibrated at the factory for a pressure ope ration of 3 8 4 2 kgs sq cm 54 60 Ibs sq in The indicat...

Page 35: ...e box When the old oil has drained and plug C re fitted introdu ce fresh oil through B until it starts to leak out from level hole A when both plugs can be put back Oil quantity required abt 0 750 lit...

Page 36: ...as follows remove the drain plugs and washer A and plugs B When the oil has drained and drain plug A screwed on introduce fresh oil through B Quantity of oil required for each fork tube about 0 160 l...

Page 37: ......

Page 38: ...mmended lubricant Shell Alvania grease 2 or an equivalent If the motorcycle is left unused for any con siderable length of time there is the possibi lity that foreign matter eventually present in the...

Page 39: ...rst with pure petrol and then with an oil petrol mixture Finally dry off with an air jet to prevent the valve from oxidizing and get ting stuck again to the tube end from the engine The unit can now b...

Page 40: ...e easy starting lever for cold starts the other is the throttle twist grip contra When starting a cold engine the easy start lever is turned on the open position A See fig 16 After the engine has warm...

Page 41: ...vibration may cause the valves on the carburetors to open with a consequent irregular carburation 2 With the filter box and the rubber inlet manifold removed check that both gas valves open at the sa...

Page 42: ...1200 r p m disconnect the plug lead of anyone of the cylinders and lightly turn screw C in fig 17 of the apposite carburetor on to the position which will give the best idling speed i e until the eng...

Page 43: ...linder plug lead start the engine and ensure that it stops after firing 4 or 5 strokes If it dies out earlier or later it is necessary to adjust idling screw B in fig 17 to the point where the engine...

Page 44: ...lerator pump 10 with main jet 11 and atomizer 12 Easy start atomizer 13 Float 14 with securing pin 15 Needle 16 Pilot air screw 17 with spring Adaptor screw 18 with washer Adaptor 19 Adaptor filter 20...

Page 45: ...Fig 18 3 42 21 5 1 23 7 j 43...

Page 46: ...dry type filter is located in a suitable housing secured to the frame Air to the car buretors is taken directly through a rubber sleeve from the filter box When the filter is too dirty replace it wit...

Page 47: ...necessary to check if there are no leakages at the fuel line connections See C fig 20 or if the filter on the taps A and the carburetors B are clean If the filters are obstructed clean them in a petro...

Page 48: ...e tank Are located under the fuel tank and are open when turned downwards See A and closed when in the horizontal position B It is a good practice to keep one tap only open and to use the other as a r...

Page 49: ...cleaned with a blunt scraper and a wire brush and washed off with petrol Check that the valve seats are properly sealed by pouring some petrol through the inlet and exhaust ducts and observing if any...

Page 50: ...ith petrol and compressed air to remove all traces of the abrasive When re assembling the heads the nuts and hold down studs should be tightened in a crossed sequence See 1 2 3 4 5 6 In fig 22 using a...

Page 51: ...w in or out screw B Correct clearance is Inlet valve 0 15 mm 0059 Exhaust valve 0 25 mm 0098 Use a feeler gauge C to check this clea rance When this is excessive there will be noisy valve operation If...

Page 52: ...Fig 23 50...

Page 53: ...Fig 24 51...

Page 54: ...nts inspected to ensure they are clean If dirty or greasy clean them with a petrol soaked cloth Cor rect gap is 0 42 0 48 mm 016 018 If they need adjusting loosen screw B which secures the fixed conta...

Page 55: ...0 48 mm 016 018 apart Ensure the left cylinder 2 is on its compression stroke i e with both valves closed Rotate the generator pul ley on the crankshaft till the slot see fig 26 is opposite mark A tra...

Page 56: ...e 2nd cylinder on the left as seen astride the saddle C is the 5 fixed advance position to the TOC D is the 25 automatic advance posi tion to the TDC E is the 33 maximum advance posi tion fixed automa...

Page 57: ...Check that this arrow coincides with the generator pulley marks C D E at the fol lowing engine speeds Mark C at 1200 100 r p m Mark D at 2200 100 r p m Mark E at 3600 100 r p m BCD Fig 26 55...

Page 58: ...that arrow A is in coincidence with pulley marks C D E at the above engine speeds then the fixed and automatic advance are quite normal IGNITION CHART I I 1000 I v I I I I I rl I 2000 R P M Fig 27 l t...

Page 59: ...y tightening its 3 securing bolts B This lever should be adjusted when the free play at the handlebar is more or less than 4 mm 1 8 Slacken thumb screw Band screw in or out adjuster A to obtain the co...

Page 60: ...58...

Page 61: ...I i I I I i j I i I I i 1 i I I I I hJUw El f J N B Do not forget that loose steering may cause wear of the taper bearings Fig 29 59...

Page 62: ...steering column See A and it is key operated To lock turn the handlebar completely to the right and insert the key turning it forward toward the front wheel Push it in release it and pull it out To o...

Page 63: ...The lever is adjusted when there is about 20 25 mm 3 4 to 1 play at the handlebar before the linings contact the drums Excessive play is corrected by acting on thum screw A and adjuster B In order to...

Page 64: ...62 disconnect the control cable from the operating lever on the R H drum brake block loosen locknut C on the L H brake block and act on adjuster D until the play at Fig 32...

Page 65: ...after loosening locknut C act on adjuster D on the brake block of the R H drum until the linings contact the drums After making this adjustment ensure by thumb pressure on the operating levers that t...

Page 66: ...is fully screwed on it means that the lining is completely worn out and has to be changed The rear suspension unit has a 3 position adjustment I for normal load II medium load III heavy load Change ov...

Page 67: ...is well to check and adjust the operating quadrant which drives the selector drum This is done by loosening lock nut Band screwing in or out the eccentric A in fig 35 to find the position where it is...

Page 68: ...REMOVAL OF WHEELS Front wheel See fig 36 66 The front wheel is removed as follows Disconnect the brake cable from its brake block levers Fig 36...

Page 69: ...o ners B from the brake blocks Unscrew the wheel spindle nut e at the R H side cif the machine Slacken the screws which secure the bottom fork cover to the wheel spindle D and slide out the wheel spin...

Page 70: ...cures the wheel spin dle to the rear drive box and the nut which secures the stay to the brake block Undo the rear brake adjusting thumb screw B and bolt C which locks the spindle to the rear fork and...

Page 71: ...no electrolyte flows over the top of the battery which must always be in a perfectly dry condition If the level in any one cell is lower than in others this may be due to either cracks or other faults...

Page 72: ...d at points 1 and 2 above but pOint 3 should read as follows 3 Let the battery at rest for 15 minutes and shake it lightly Check the electrolyte level and top up as necessary Screw the plugs on tightl...

Page 73: ...th slightly moistened in petrol Copper or carbon dust which may have de posited in between the rotor blades can be removed by compressed air When cleaning the commutator check also the condition of th...

Page 74: ...f irregular operation have it seen to by competent electricians or re place it Does not require any adjustment but in case of faulty operation remove its cover and check all contacts screwing down tig...

Page 75: ...the cause and re place with a similar fuse Check these over occasionally and ensure their perfect condition Replace if necessary N B If any extra accessories are added ensure they are connected to th...

Page 76: ...c c...

Page 77: ...AKEA H T COil S1ARTER BUTTON HORN NEUTRAL INOICATOR CUTOUT STOP LIGHT OIL PRESSURE CUTOUT IGNITION SWITCH NUMBER PLATE AND TAIL LIGHT PLATE ILlUMINAnON GENERATOR REGULATOR BATTERY STARTER MOTOR SOLENO...

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MOTO GUZZI 850 GT 1972, Riders Handbook

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