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XS360 (1976-1982)
Инструкция по эксплуатации Страница: 24

Yamaha XS360 (1976-1982) [24/34] Yamaha xs360 400

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Yamaha XS360 400 2 It is the ability of the diodes to pass cur rent one way and stop it in the other which is tested when checking the rectifier 3 The rectifier can be checked with an ohmmeter or a self powered low voltage test light Disconnect the rectifier wiring and re move it from the motorcycle 4 Connect the positive lead of the tester В R to the rectifier red lead and the negative Voltage regulator tester lead to each of the three white leads in tum Note whether or not there is continuity BROWN in each case Now reverse the tester connec tions so that the negative tester lead is con nected to the red rectifier lead and the posi tive tester lead is connected to each white lead in turn Note whether or not there is continuity If there was continuity for a certain con nection during the first test there should not be any when the tester leads are reversed If there was continuity in both cases or lack of Checking resistance between the brown lead and continuity in both cases a diode is defective ground and the rectifier must be replaced 5 Connect the positive lead of the tester check them when the engine is cold to en to the rectifier black lead and the negative tester lead to each of the three white leads in sure accuracy tum Repeat the test with these connections Replace the rectifier if all tests are not satis Regulator factory A mechanical voltage regulator is used on all models The regulator is adjustable although this procedure given below should not be BREAKER POINT IGNITION attempted until the regulator has first been Troubleshooting checked for defects 1 Perform the alternator output test and 1 In the event of failure of the ignition field coil armature tests first If the alternator system first check the fuses if all are in proves satisfactory check the regulator working order check that the snap connec 2 Disconnect the wiring and remove the tors for the coils and breaker points are all regulator from the motorcycle clean and tight 3 With an ohmmeter check the resis 2 At this point refer to chapters 2 and 3 tance between the black regulator lead and for inspection procedures for the breaker the regulator base black Resistance should points plugs and battery If these items are be 10 5 ohms If the measured resistance is all in working order the problem may be not within 2 ohms of this figure replace the isolated to the coils condensers or plug regulator caps 4 Check the resistance between the 3 If only one cylinder fails to fire and the green and the brown regulator leads Resis problem is not a loose connection or defec tance should be 140 ohms If the measured tive spark plug suspect the plug cap The resistance is not within 10 ohms of this fig caps are fitted with a resistor to prevent radio ure replace the regulator interference while in operation and heat and 5 If the resistance tests indicate that the vibration may cause the value of this resistor regulator winding and resistor are satisfac to increase considerably even to becoming tory but the charging system is not develop an open circuit ing the standard 14 5 v across the battery The easiest way to see if a misfire is due to the regulator may be in need of adjustment a defective cap is to switch the plug cap of the However it would be wise to check the recti non firing cylinder with the other cap If the fier first dead cylinder begins to fire and the other cyl 6 Remove the regulator cover Install the inder ceases the problem is the plug cap unit on the motorcycle checking that all wir The caps should be replaced as a set ing connections are correct Functional caps will have a resistance of 7 Disconnect the fuse box wire leading to 9 000 ohms Usually when resistance ex the battery Connect a voltmeter from the ceeds this valve significantly the plug for fuse box to ground Start the engine and that cap will no longer fire allow it to run at 2 500 rpm At this point the Caps are easily removable by unscrewing voltmeter should read 14 5 15 0 v If it does them from their cables not tum the regulator adjusting screw to ob 4 Defective condensers are seldom a tain the correct voltage output Tum the problem since these are now usually re screw in to raise the voltage output and out placed along with the breaker points Defec to lower it tive condensers will cause considerable arc ing or sparking between the breaker point Rectifier contacts while the machine is running and 1 The rectifier consists of a six diode this should be cause for replacement before bridge A diode will allow current to pass they fail completely Badly burned or pitted in one direction only If any diode allows cur point contact surfaces can also be caused by rent to pass in both directions or in neither defective condensers as well as by improper direction the operation of the entire unit will adjustment If the points are in bad condi be upset and the rectifier will have to be re tion replace them and the condensers as placed well 1286 5 Condenser capacity can be checked with electrical test equipment if available in place on the machine provided the con denser is first disconnected from the primary terminal Capacitance should be 0 24 MFD The resistance of the condensers should be in excess of 3 Mil A variation of 10 in either reading is allowable 6 If the condensers are not suspect check the ignition coils Coils should be checked for continuity of the windings First remove the gas tank Disconnect the red white coil lead and the other lead which is orange for the left cylinder s coil or grey for the right Check resistance across the leads It should be about 4 ohms If the resistance is not very close to this figure the primary winding is defective and the coil must be replaced 7 To check the secondary coil first re move the spark plug cap from the plug lead Check the resistance between the plug lead and the orange or grey lead Secondary wind ing resistance should be 9 5 K ohms If the measured resistance is not very close to this value the secondary winding is breaking down and the coil must be replaced TRANSISTORIZED IGNITION Troubleshooting 1 In the event of spark failure first check the entire electrical system for loose connec tions 2 Check that the battery is fully charged Recharge if necessary 3 Check all fuses 4 If all of the above elements are found satisfactory check the resistance of the igni tion coil primary and secondary windings Primary winding resistance should be about 3 ohms Secondary resistance should be about 8 6 K ohms The primary winding leads at the coils are red white and orange The secondary wind ing resistance is checked between the spark plug lead minus cap and the re white lead 5 Check the pick up coils resistance It should be about 700 plus minus 150 ohms 6 If all of the above elements are satisfac tory replace the TCI unit Pick up Coil REMOVAL AND INSTALLATION The pick up coils are located beneath the cover on the left side of the cylinder head 1 Centerpunch the blind plug which se cures the cover Use a 5 mm drill bit to drill the plug 2 Cut internal threads 6 mm diameter x 1 0 mm pitch in the blind plug with a proper sized tap Thread in the special slide ham mer or a suitable metric bolt and pull out the plug 3 Remove the cover screws and take off the cover 4 Remove the rotor bolt and rotor 5 Remove the pick up coil screws and take off the assembly 6 Installation is the reverse of removal Install the rotor and tighten the rotor bolt to 7 ft lbs Check the ignition timing as outlined in Tune Up Rotate the pick up coil base plate if necessary until the timing marks align as specified After fitting the pick up coil cover install a new blind plug Do not

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