Yamaha XS360 (1976-1982) [10/34] Yamaha xs360 400

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Yamaha XS360 400 feed line if necessary so that the synchro nization screw between the carburetors is ac cessible 3 The vacuum gauge fittings are on the manifolds The vacuum gauge fitting for the right cylinder operates the fuel petcock Dis connect the petcock line from the fitting and turn the petcock to the Prime position for the duration of the procedure 4 Connect the vacuum gauges 5 Start the engine and note the vacuum readings At idle 1 200 rpm the two cylin ders must be within 5 cm Hg 0 2 in Hg Adjust if necessary by turning the synchro nization screw in or out until the vacuum readings for the two cylinders is as identical as possible NOTE If the vacuum gauges read more than 5 cm Hg 0 2 in Hg at 1 200 rpm check the compression spark plugs igni tion timing and valve clearance 6 If vacuum gauges are not available a rough method of synchronizing the carbu retors may be carried out Remove the car buretors as a unit from the motorcycle Look into the engine side of the carburetors and note the relative positions of the edges of the butterflies in relation to the small by pass passages in the bottom of the bores Both butterflies should be in the same position relative to these by pass holes Idle Speed and Mixture Carburetor synchronizing screw 1 The idle mixture is controlled by a pilot screw fitted to each carburetor The screws are fixed in position by means of idle limiter caps This is designed to reduce emissions Therefore it is not generally necessary to ad just the pilot screws 2 If the limiter caps are missing or if the pilot screws have been removed as during a carburetor overhaul pilot screw adjustment is accomplished by screwing the pilot screws in very carefully until lightly seated then backing them out 1 turns on 360 models and 1 turns on 400 models 3 Idle speed is set by means of the throt tle stop screw between the carburetors Idle speed is 1 200 rpm and must be adjusted when the engine is at operating temperature Throttle stop screw Tune Up Specifications Manifold vacuum fitting left side Item Other Models 140 170 15 140 170 15 140 170 15 Valve clearance Intake mm in Exhaust mm in 0 08 0 12 0 003 0 005 0 16 0 20 0 006 0 008 0 08 0 12 0 003 0 005 0 16 0 20 0 006 0 008 0 08 0 12 0 003 0 005 0 16 0 20 0 006 0 008 NGK Champion BP 6ES N 7Y BP 5ES N 13Y BP 7ES N 8Y 0 7 0 8 0 028 0 032 0 3 0 4 0 012 0 016 NGK Champion BP 7ES N 7 BP 6ES N 13Y BP 8ES N 8Y 0 7 0 8 0 028 0 032 0 3 0 4 0 012 0 016 NGK Champion BP 6ES N 7Y BP 5ES N 13Y BP 7ES N 8Y 0 7 0 8 0 028 0 032 0 3 0 4 0 012 0 016 Carburetion Idle speed rpm Pilot screws turns out Vacuum uniformity cm in Hg Float level mm in 1272 XS400DIE Compression Cranking pressure psi Max allowable variation psi Ignition Spark plugs OEM Standard Hot Cold Spark plug gap mm in Breaker point gap mm in Ignition timing Static degrees BTDC Maximum degrees BTDC 2500 rpm Aligning both butterflies relative to the bypass outlet Is a rough way to synchronize the car buretors XS360 XS400 2E 25 7 1 0 XS400F 2F 32 0 1 26 XS400G SG H 27 3 1 1 10 10 10 36 36 36 1 200 1У2 1 200 1У4 1 200 not adjustable 5 0 2 26 6 1 05 5 0 2 32 0 1 26 5 0 2

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