Yamaha XS360 (1976-1982) [8/34] Yamaha xs360 400

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Yamaha XS360 400 Lubrication 1 On all models it is necessary to oc casionally lubricate the cam follower fiber heel and the pivot point of the contact breaker This minimizes wear and ensures that the timing will remain accurate for a longer period A worn heel will retard the timing 2 A small dab of grease high melting point if possible should be applied to the lubricator wick so that the lubricator can dis tribute it onto the breaker cam A drop of engine oil should be applied to the pivot point 3 In both cases it is imperative that care be taken to keep the lubricant away from the points contact surface 4 The lubricating wick should be adjusted so that it just contacts the breaker cam Primary wire connectors beneath the gas tank solvent before attempting to start the ma chine 4 If the motorcycle will not start immedi ately after installation of new points check that the primary wire connections under the gas tank are tight that the insulating washers at the primary terminal are properly in stalled and that the contact surfaces are thoroughly cleaned 5 Condensers are easily replaced after disconnecting the lead near the coils and removing the screw which secures the con denser Gapping Periodic gapping is necessary to compensate for erosion of the contact surfaces due to elec trical arcing and for wear of the fiber heel As the heel wears the points will open later rel ative to the rotation of the crankshaft thus retarding the timing slightly Points should be filed if necessary and cleaned before gapping 1 Remove the points cover 2 Turn the engine over until one of the two sets of points is fully open 3 With the proper feeler gauge blade check the gap The proper specification is 0 3 0 4 mm 0 012 0 016 in and the blade Checking point gap should be a slip fit between the points if the gap is correct 4 If adjustment is necessary loosen the screws which secure the point set to its plate and use a small screwdriver at the pry point provided to adjust the gap CAUTION Loosen the screws Just enough to allow the points to be moved If loosened too much the points will snap shut instead of holding the gap 5 Tighten the screws and recheck the gap It may change slightly when the screws are tightened 6 Repeat the procedure with the remain ing points set Try to adjust both sets so that the feeler gauge blade has the same feel in both sets This will help to ensure accurate timing 7 If it is not possible to gap the points cor rectly the fiber heel is evidently worn the points should then be replaced IGNITION TIMING BREAKER POINT MODELS All models except the XS400G SG and H models are fitted with contact breaker points Procedures for the transistorized ignition found on the G SG and H models are given in the next section The rotor marks are interpreted as follows LT indicates top dead center for the left piston RT for the right piston LF and RF are the fixed advance firing points for the two pistons which is about 10 before TDC There are in addition two other marks and these represent the full advance firing points which is about 36 before TDC Timing advance begins at about 2500 rpm NOTE Points must be cleaned and gapped before checking timing Dirty points will cause inaccurate readings Remove the points cover and observe the breaker plate Note that the points for the left cylinder orange lead are mounted di rectly to the large breaker plate while the points for the right cylinder grey lead are mounted on a smaller moveable plate Therefore the left cylinder timing must be set first since adjustment involves turning the entire breaker plate which will alter the timing of the right cylinder as well The points for the right cylinder are adjusted by moving only the points themselves w Dynamic Timing 1 Park the bike on the centerstand in a well ventilated area Loosen the screws Indicated by arrows to adjust the point gap for both point sets 1270 Static firing point for the left side cylinder

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