Yamaha XS400 (1976-1982) [23/34] Yamaha xs360 400
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Yamaha XS400 (1976-1982) [23/34] Yamaha xs360 400

Yamaha XS400 (1976-1982) [23/34] Yamaha xs360 400

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Yamaha XS360 400 3 If the throttle slide and needle have FUEL PETCOCK 8 Inspect the tip of the float needle and the needle seat for dirt or corrosion Check been disassembled check that both needle the needle tip for wear If worn the needle clips are installed in the correct groove from The petcock is the vacuum activated type the top of the needle Refer to the Car which incorporates a mesh filter inside the should be replaced If there is any corrosion or deposits evi buretor Specifications chart at the end of gas tank this section for the correct needle clip posi 1 Set the petcock to the RES position dent on the needle or needle seat the de tion Disconnect the fuel line from the petcock posits must be removed or the parts re and the vacuum line from the manifold placed 2 Remove the gas tank Drain off the fuel NOTE Do not attempt to clean the needle 3 Unscrew the petcock securing nut or or needle seat by lapping one against the two phillips screws depending upon the other method of fastening and pull off the petcock To check the efficiency of the float needle 4 Clean the filter screen in a solvent Be valve proceed as follows sure to remove any foreign matter trapped in a With the carburetor assembled ex the screen as this will impede fuel flow If the cept for the float bowl connect it to its fuel screen cannot be cleaned or if it is punc line b Place a number of dry rags beneath tured or otherwise damaged it should be re placed the carburetor and hold it upright in its 5 Check the sealing washer and replace it normal operating position with one hand c With the other hand gently raise the Be sure that the diaphragm tab is properly if it is damaged float assembly until the float needle is seated 6 Install the petcock After the tank is refitted check for leaks before operating the seated Have an assistant turn the fuel pet cock on Prime position 4 When installing the pilot screws turn motorcycle d If the needle and seat are in good them in gently until they are lightly seated 7 Check operation of the petcock after condition and forming a good seal no gaso then back them out PA turns on XS360 mod disconnecting the fuel feed line No fuel line will flow out of the carburetor els and 1 4 turns on XS400 models Fit the should flow out when the lever is in the On or RES positions This should happen only e If a leak is noted replace the needle idler limiter caps and seat 5 When fitting the throttle slide be sure when the lever is set to the Prime position CAUTION While performing this test be to engage the tab on the diaphragm with the If fuel does flow in the other positions re place the petcock sure that adequate precautions are taken in cut out in the carburetor body 6 Check the float level as outlined in the the event of spillage 8 In the event that fuel flow is a problem The float level should be checked prior to Tune Up section check that the vacuum line is tightly secured assembly 7 When installing the choke rod be sure at both ends and is free from dry rotting or 9 Check that the tapered portion of the that the securing screws fit into the shaft other damage Replace the vacuum line if any damage is noted pilot screw is smooth and clean Replace it if detents it is crushed or blunted 10 Inspect the float bowl for a warped gasket surface or stress cracks especially around the screw holes Carburetor Specifications 11 Check the throttle slide diaphragm for XS360 XS400D XS400E F 2F XS400 2E XS400G SG H rips Replace the assembly if the diaphragm is damaged Repairs are not possible Assembly Assembly is basically the reverse of the disas sembly procedure Note the following points 1 Always use new gaskets and O rings 2 Exercise care when installing jets they are made of soft brass and are easily damaged if overtightened Type Main jet Air jet Jet Needle Needle clip position from top Needle jet Throttle slide Pilot jet Pilot screw turns out Float level mm in Mikuni BS34 135 0 6 4FP21 3 3 X 6 145 17 5 1V2 26 6 1 05 Mikuni BS34 142 5 45 5Z1 4 4 X 4 135 42 5 Mikuni BS34 132 5 45 5Z1 3 3 X 6 135 42 5 VA VA 32 0 1 26 32 0 1 26 Mikuni BS34 137 5 45 5Z1 3 3 X 6 135 42 5 Preset 25 7 1 0 Mikuni BS34 135 45 5GZ9 na Y 2 na 42 5 Preset 27 3 1 1 ELECTRICAL SYSTEM CHARGING SYSTEM Alternator OUTPUT CHECK NOTE To give accurate results the bat tery must be in good condition and fully charged before petforming the output test 1 Connect a D C voltmeter across the battery terminals 2 Start the engine and let it run at about 2 000 or more rpm 3 Battery voltage on the meter should be 14 5 v with a maximum allowable variation of 0 3 v 4 If the voltage is greater than this check the voltage regulator see below If it is less check the alternator wiring the regulator and the rectifier CAUTION Never run the engine with the battery leads disconnected To do so risks ruining the other charging system compo nents FIELD COILIARMATURE TESTS field coil leads green green Resistance should be 4 0 ohms If the measured resis tance is not within 15 of this figure replace the field coil N OTE Resistance figures are taken at 20 C 68 F Therefore it is preferable to 1 With the engine off disconnect the al ternator wiring at the connector With an ohmmeter check the resistance between each of the three white leads Resistance should be 0 72 ohms 2 If the resistance is not within 10 of this value the problem is probably with the alternator armature wiring If the resistance is too high the wiring is probably broken if it is too low the windings may be breaking down In either event the armature must be replaced 3 Check the resistance across the two Alternator wiring schematic 1285

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