Yamaha XS360 (1976-1982) [7/34] Yamaha xs360 400
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Yamaha XS360 (1976-1982) [7/34] Yamaha xs360 400

Yamaha XS360 (1976-1982) [7/34] Yamaha xs360 400

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Yamaha XS360 400 TUNE UP quiet Ticking from properly adjusted valves is sometimes due to the valve stem becoming indented by the valve adjuster screw This should be confined to older machines since the valve ends are stellitecoated indentations on the valve stem will give a false feeler gauge reading the clear ance will be too large Valves can be checked by visual inspection by unscrew ing the adjuster While more annoying than harmful the only safe remedy for this situation is re placement of the valves NOTE Common tune up procedures are explained in detail in the General Infor mation section COMPRESSION TEST 1 A compression check should be made before each tune up since this will provide a general idea of engine condition 2 It is necessary to have a gauge with the proper adapter plug holes are 14 mm if a screw in type gauge is used The less expen sive hold in type gauges can also be used Use some oil on the rubber tip to ensure a good seal 3 The engine should be at operating tem perature when checking compression 4 Remove both of the spark plugs and fit the gauge to one of the plug holes 5 Close the choke and hold the throttle wide open while spinning the engine with the starter motor or the kickstarter Note the highest compression reading and repeat the test with the remaining cylinder 6 Compression may vary according to gauge tolerance and several other factors However it should normally be between 140 and 170 psi Both cylinders must be within 15 psi of this range and of each other CONTACT BREAKER POINTS Location Checking valve adjustment The contact breaker points are opened and closed by a cam on the end of the camshaft and are located beneath a cover on the left side of the cylinder head The timing advance mechanism is located behind the breaker point plate The condensers are mounted near the coils CAM CHAIN ADJUSTMENT The cam chain tension is automatically regu lated No routine adjustment is required VALVE ADJUSTMENT NOTE Valves must be adjusted when the engine is cold 1 Turn the fuel petcock to the RES position Disconnect the fuel feed line and the vacuum line from the petcock 2 Remove the gas tank 3 Remove the intake and exhaust tappet covers 4 Remove the alternator rotor cover 5 The valves for each cylinder are ad justed when the piston for the cylinder is at top dead center on the compression stroke Use a wrench on the rotor nut so that the LT mark on the rotor is aligned with the stationary timing mark on the crankcase cover Check that there is clearance at both valves for the left cylinder There should be a Alternator rotor cover alien bolts Alternator rotor aligned with timing mark to posi tion right side piston at top dead center little movement in both rocker arms If there is not it indicates that the piston is at TDC on the exhaust stroke If this is the case ro tate the engine through one full turn of the rotor and align the LT mark again This should be TDC on the compression stroke 6 Check the clearance between the rocker arm and the top of the valve for both intake and exhaust valves using the appropri ate feeler gauges Clearances should be 0 08 0 12 mm 0 003 0 005 in for the intake and 0 16 0 20 mm 0 006 0 008 in for the exhaust If the clearance is correct a feeler gauge of the proper thickness will be a light slip fit be tween the rocker arm and valve 7 If adjustment is necessary loosen the adjuster locknut and turn the adjuster screw so that clearance is correct Again the feeler gauge should be a slip fit between the rocker arm and valve Hold the adjuster in place and tighten the locknut securely Recheck the clearance 8 Turn the rotor one full turn so that the RT mark for the right cylinder is aligned with the stationary timing mark Check that the piston is at TDC on the compression stroke by noting clearance at both valves as before Check the right cylinder valves in the same manner NOTE When the engine is at operating temperature the valves should be very Breaker point cover screws Replacement 1 Points sets purchased complete with the breaker plate can be easily replaced by disconnecting the primary wires at the con nectors beneath the gas tank removing the two large breaker plate securing screws and carefully pulling off the old plate and points After installing the new points and plate the breaker point gaps and the ignition timing must be set see below 2 If the points are purchased separately disconnect the primary wire at each point set remove the securing screws and remove the old points When installing new points note that the proper installation of the insu lating washers at the primary terminal is crit ical If improperly installed no spark will occur There is a small insulating tube which fits around the terminal bolt and two insulat ing washers one immediately on either side of the terminal bracket All connectors pri mary wire points spring are made on the outer sides of these washers i e no connec tor must touch the bracket which is a ground 3 New points may have a protective coat ing on the contact surfaces to prevent oxida tion Clean off these surfaces with a non oily 1269

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