Ducati 750 GT User Manual Download

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Summary of Contents for 750 GT

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Page 3: ...ished by TRACTOR MECHANICAL PUBLICATIONS PTY L TO for u 55 57 Hume S eet Crows Nest N S W Telephone 4395088 and at 405 Pitt Street Sydney N S W Australia Telephone 2124486 Telegrams Cables Cycleserv S...

Page 4: ...ission of Tractor Mechanical Publications Pty Ltd No liability can be accepted for any inaccuracies or omissions in this publication although every reasonable care has been taken to make it as complet...

Page 5: ...k Ignition A vance 5 Specifications 860 7 Maintenance 750 and 860 8 Care of Battery 11 Locating and Remedying Faults 12 Disassembling and Re assembling Engine 15 Electronic Ignition 860 57 Wiring Diag...

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Page 7: ...g system is provided with overhead valves inclined at 800 timed by an overhead camshaft The valves are made of special steel SUCTION COMPRESSION WORKINGSTROKE EXHAUST i V _ _ With a valve rocker clear...

Page 8: ...tches to indicate lowest and highest permissible levels and the level is checked by resting the plug on the filer The system is quite simple and requires no special maintenance other than topping up t...

Page 9: ...d on the primary shaft of the gear box The clutch housing which is made of spec ial hardened steel tUrns on two internal bearings and is lubricated with the engine sprocket The clutch is operated by a...

Page 10: ...key is inserted When replacing them be sure not to reverse the connections Horn The 12 Volt horn is mounted under the handlebars Stop lamp switch A new type of switch is mounted on the left and rear o...

Page 11: ...engine can be started and the white ignition light in the centre of the dashboard remains alight until the engine is stopped The battery is recharged while the engine is Running Light Switch Centre p...

Page 12: ...FlizaNTAL CYLINDER 6 Rotate the driving shaft slowly clockwise until the light goes out or its intensity is lowered At that precise moment the indicator should show an advance of 100 Fig 8 7 Repeat th...

Page 13: ...ith the magnetic flywheel attached to the axle on the left hand side Access to the generator is via the left hand cover and clutch To time the ignition 1 Fit the protractor wheel to the engine axle 2...

Page 14: ...ergency lights F4 8A Stop light and horn F5 8A Direction indicators The headlight is a 50 55 Watt 12 Volt quartz iodine bulb and the dashboard warning lights are as follows GEN Red Key inserted L Whit...

Page 15: ...ove the carburettor air filters and clean with compressed air Clean out the carburettor float chamber the main jet and the idle jet Readjust the clutch to take up any wear on the plates Lubricate the...

Page 16: ...t oil changes should be carried out every 5 000 Km 3 000 miles and the filter replaced every 10 000 Km 6 000 miles Periodic Disc Brake Maintenance 750 and 860 Clean the hydraulic pump and calipers cle...

Page 17: ...of 1 2A for between 15 and 20 hours Charge until the battery electrolyte reaches the density referred to above Mounting Secure the battery firmly in position on the motorcycle Make sure that the termi...

Page 18: ...clean out the float chamber Carburettor float leaking Change the float Jet is clogged Remove the obstacle by a strong blast of air The cable of the ignition coil is broken or Inspect the cable insula...

Page 19: ...ctions on page 11 Disconnect the wire from the ter minal block ofthe battery Insert an ammeter in between the terminal clamp and the wire Insert the ignition key and let the engine turn til attaining...

Page 20: ...nt screw of the carburettor Bowden cable Clean out the carburettor and especially the needle seat Empty the petrol tank and refil at a reliable garage If the sparking plug overheats you will have prei...

Page 21: ...15 DISASSEMBLING and REASSEMBLING UCAT 750 860 ENGINES...

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Page 23: ...have no difficulty in interpreting information on the 750 and applying it to his own machine Identification Numbers Both the 750 and 860 models can be identified by two numbers one for the frame and...

Page 24: ...engine since the engine will be automatically timed after you refit the head Removing the head By means of a 17mm polygon wrench 860 16mm slightly loosen the four nuts in a crossed sequence This is ne...

Page 25: ...clipfrom the gudgeon pin Remove the circlip with a pair of pointed pliers It is important to cover the crankshaft opening with a clean cloth to prevent the circlip from fallng into the engine Removing...

Page 26: ...ver with a plastic hammer to allow the cover to come off evenly Never insert a screw driver between the sealing surfaces Removing the clutch Remove the sb screws the springs and the cups and pull out...

Page 27: ...of the gear with a pair of pliers Then use the puller to remove the assembly from the shaft cone While performing this operation use 30 mm wrench as shown to prevent the engine from rotating Removing...

Page 28: ...ing the engine from the frame Removing the timing side cover Remove the nine screws and gently tap on the coverwith a plastic hammer until it can be easily removed Removing the cable seal ring First r...

Page 29: ...Removing the chain pinion 750 Insert tool 88713 0107 between the teeth of the chain pinion and position it against the crankcase Then open the lock washer and remove the fixing ring using tool 88713 0...

Page 30: ...n the lock washer and insert a pin of about 14mm in diameter in the crankcase hole as shown until it enters the crankshaft opening This wil prevent the engine from rotating With a 13mm spanner undo th...

Page 31: ...kets under the bush must be kept apart since they must be put in the original place at the engine re assembling Removing the ignition distributor 750 Set one piston at top dead centre and fit the dial...

Page 32: ...r on the driving shaft Then fit tool 88713 0108 on the shaft to prevent the engine from rotating Then remove the half bush and Seeger ring which retain the control gear Open the lock washer and remove...

Page 33: ...attention that the ball and the spring are both fitted to the crankcase when the block is removed they can fall and be lost Opening the crankcase With a 5 mm hexagonal wrench undo the eight screws fi...

Page 34: ...ake special care to avoid mixing the thrust washers since they must be refitted exactly when assembling the engine Removing the transmission shaft With a hardened steel naif remove the stop ring washe...

Page 35: ...ING THE ENGINE Refitting crankshaft gear Before re fitting the gear check the wear of the two oil seals one inside the gear and the second fitted to the outside crankcase under the chain pinion Refitt...

Page 36: ...e bearing on the clutch side half crankcase Starter assembly This figure shows the various components of the starter assembly exactly as they are fitted the thrust washer the gear the second thrust wa...

Page 37: ...forks This figure ilustrates how the forks are fitted These forks must be fitted before the gear control drum Fitting the gear drum The gear drum must be fitted in its seat taking care to position th...

Page 38: ...ed in the figure When the crankcase is completely assembled there should be no end float in the drive shaft Fitting the two half crankcases Carefully clean the contact surfaces and make sure that the...

Page 39: ...o be tightened with a 8 mm wrench The figure shows the different components Fitting the oil pump 750 First fit the spring then the ball and the pump assembly previously assembled with the gears the co...

Page 40: ...indle Fitting the side bevel gear bushes Fitting must be carried out as follows Fit the rubber ring in the bush Fit the bearings with their distance piece Bearings must be placed with the greater roll...

Page 41: ...sition the conical gear and fit the other thickness washers Then fit the bearing holding bush as outlined in the next illustration Fitting the side bevel gears First insert the conical gear from the l...

Page 42: ...e two gear holding spindles The figure shows the two spindles holding the gears already fitted in their seats Before fitting remember to put the thrust washers under the spindles Fitting the two timin...

Page 43: ...h end play does not cause any malfunction and limited end play may be allowed However it is very important to check that there is no play under the two conical gears fitted to the above spindles and t...

Page 44: ...ion This fitting must be carried out as follows Fit the distance ring Fit the chain pinion taking care to place the higher hub towards outside Fit the stop washer Fit the threaded rim Insert tool 8871...

Page 45: ...r face This is necessary to allow the distributor to block the central gear group and apply pressure against the distributor gasket After this is done the ignition distributor can be fitted Once the d...

Page 46: ...n this manner you can correct the mesh of the three gears in the upper group Fitting the timing side cover Before fitting the cover ensure that the three dowels are in good condition and in the correc...

Page 47: ...ate in its seat and fix it with the three screws which have to be tightened in a way that the stator plate may rotate The stator plate will be finally fixed later after the ignition advance has been a...

Page 48: ...ts shaft being careful that it is well centered in respect to the driving gear fitted on the flywheeL Make sure there is no play or tightness between these two gears Fitting the clutch drum Fit the cl...

Page 49: ...ng plate having the outer teeth towards interior Then fit the pressure plate and the shim with its counternut IMPORT ANT Before fitting the gear selector cover install the following parts in the trans...

Page 50: ...piston rings so that the union slits are atabout 1200 between each other Slowly insert the piston in the cylinder keeping the rings closed with your hand being careful not to damage the rings The figu...

Page 51: ...ntre of the rear cylinder on the compression stroke Fit the degree wheel on the crankshaft in zero position Turn the degree wheel in a clockwise direction until the points are fully open and set the p...

Page 52: ...nce The automatic advance is 280 and the total advance is 380 The ignition distributor 750 This figure shows the distributor plate The cam with one lobe and the two sets of points can be seen in parti...

Page 53: ...g the rocker pin 750 Screw tool 88713 0260 in the threaded hole of the rocker pin With an 11 mm wrench hold the central screw With a 17 mm wrench rotate the puller until the pili can be removed from t...

Page 54: ...ich holds the hex nut With tool 88713 0263 attached to a cam lobe hold the shaft to prevent it from rotating Then remove the nut with a 22 mm wrench Removing the conical gear with the transmission sha...

Page 55: ...embly in the fitting order The head The ball bearing The two distance pieces The timing support in which the bearings the gasket the shim rings and the two seegers must be fitted The conical gear The...

Page 56: ...en fitting the flange make sure to position it in the proper direction with the fins corresponding to those of the appro priate head Fitting the rocker First fit the adjusting cap on the valve stem Fi...

Page 57: ...various components of this group which are fitted in the following order The valve The brass washer The lower plate The oil seal rubber The spring The upper plate The two half cones When assembling th...

Page 58: ...the rocker Remove the special tool and fit the regular pin Checking rocker clearance 8GO Check the play under the rockers with a feeler gauge with cold engine The clearance must be 0 08 mm for the in...

Page 59: ...0119 in the appropriate hole on the generator rotor and turn the stator plate until the pin slips into the corresponding stator plate hole Ignition timing securing the stator plate 860 Keeping the pin...

Page 60: ...already given with the previous figure and check that the magnet rotor is clean and without metallic splits Place the gasket and fit the cover taking care not to damage the alternator winding Tighten...

Page 61: ...the electronic ignition rotor visible Electric starter 860 The figure shows the components of the electric starter group fully dismantled From the left these are the cover two gears with their chain...

Page 62: ...the above two bolts Then refit the two plastic caps The chain must have 15 20 mm play with the motorcycle on the ground and the driver on the rear part of the saddle To adjust the chain it is necessa...

Page 63: ...and run to the transducers The red cable must be connected to the transducer serving the vertical cylinder b TRANSDUCERS Two high tension coils connected to the spark plugs The three wires from the g...

Page 64: ...ts of two coils positioned at a phase angle appropriate to the ignition timing for each cylinder The rotor is also a single unit fitting on to the crankshaft inside the permanent inductor magnets The...

Page 65: ...ohmmeter must indicate a resistance value of 150 n If the linking device is shown to be functioning properly all the circuit wiring must be carefully checked especially the violet and blue cables conn...

Page 66: ...e faultthe defect must be in the stator plate in this case carry out the following tests j disconnect the generator cable from appropriate transducer ii Connect one Ohmmeter terminal to earth and the...

Page 67: ...troboscopic light test With a stroboscopic light pistol it is possible to test whether sparki g does occur or not and also to check the ignition advance as described on page 7 Bench test On a test ben...

Page 68: ...62 NOTES...

Page 69: ...i r 1 L _ Qg FlI DUCATI750GT i HEA 2 RELAV 3 INTIT UBHT a STOP SW 8 INSTA LIGHT 1D DAH BOAR 11 DAZLING LI 12 GENER 13 PARKING lITS COL A LE HD DIRETIONAL INDICATOR Ii RIGHT HAD DIRECONA INDICATOR II...

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Ducati 750 GT, Owner'S Manual

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