Yamaha XS360 (1976-1982) [9/34] Yamaha xs360 400
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Yamaha XS360 (1976-1982) [9/34] Yamaha xs360 400

Yamaha XS360 (1976-1982) [9/34] Yamaha xs360 400

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Yamaha XS360 400 set so that proper mark alignment is achieved Tighten the screws 9 If it is not possible to achieve full ad vance alignment without moving the base plate or the right points set all the way to the end of their range of allowable travel it is possible that the points are either incorrectly gapped or that they are worn to the point where they must be replaced vertically lower the float until the float arm just touches but does not depress the tip of the float needle Float level is the measured distance from the bottom of the float to the float bowl mating surface Static Timing Full advance firing point Is Indicated by two lines 2 Remove the points cover and the al ternator rotor cover Clean and gap both sets of points as previously described 3 Hook up the strobe light according to the manufacturer s instructions to pick up impulses from the left cylinder 4 Start the engine and adjust the idle speed if necessary to 1 200 rpm 5 Aim the timing light at the marks on the alternator rotor visible through the cut out At idle the LF mark on the rotor should align with the stationary timing mark 6 To check the ignition timing at full ad vance increase engine speed until the motor is turning 2 500 3 000 rpm At this point the stationary timing mark should be between the two full advance marks scribed onto the alternator rotor 7 If adjustment is necessary loosen the two large base plate screws and rotate the 1 Remove the points cover and the alter nator rotor cover 2 Clean and gap both sets of points as de scribed previously 3 Connect one lead of the tester or test light to the primary wire terminal for the left cylinder orange lead and the other tester lead to ground on the engine or frame 4 If the test device is not self powered turn the ignition switch on and be sure the kill switch is in the middle position 5 Turn the engine over in the normal di rection of rotation until the LF mark aligns with the stationary timing mark The test in strument should react at the instant these marks align indicating that the points have opened If they do not loosen the two large screws which secure the points base plate and rotate the plate so that the points just open when the timing marks are in align ment Tighten the base plate screws and re check the timing 6 Repeat the procedure with the right points set If adjustment is necessary loosen the two screws which secure these points to their mounting plate and use a small screw driver at the pry point provided Tighten the screws and recheck the timing Checking float level 4 Float level for each model is given in the Tune Up Specifications chart at the end of this section Adjust if necessary by pushing out the float pivot pin removing the floats and bending the float arm tang Bend ing the tang towards the carburetor body will increase the float level measurement and vice versa 5 Both carburetors must have the same float level Measure both before changing ei ther Note that the measured float level will be inaccurate if the float needle tip is worn or if there is foreign matter on the needle seat IGNITION TIMING XS400G SG H Because of the transistorized spark unit which is used in place of the more conven tional breaker points ignition timing for these models need not be checked unless the pick up unit is removed If a check is required note that the LF timing mark on the rotor should align with the index mark at 1200 rpm Dynamic timing using a strobe light is the only method of checking the timing Adjustment is not pos sible If the marks are not properly aligned at the given speed the only cause would be a loose spark unit rotor bolt CARBURETORS Adjusting the float tang Carburetor adjustments to be made during a To adjust the timing for the left cylinder loosen the two breaker plate screws large arrows and tune up include setting float level synchro Synchronization rotate the entire plate To adjust the right cylin nization and idle speed and mixture der loosen the two point screws smaller arrows Vacuum gauges are necessary to properly and move the right cylinder s points synchronize the carburetors although a Adjusting Float Level rough approximation can be made by visually 1 Float level is a measure of the amount aligning the butterflies see below entire plate so that the proper marks align at the specified rpm Establishing this align of gasoline which will be in the float bowls The butterflies are synchronized by means ment at full advance is recommended during operation While it is a critical specifi of a single screw located between the two cation it will not normally need readjust carburetors Turning the screw simulta Tighten the base plate screws 8 Repeat the procedure this time hav ment once properly set Float level there neously closes one butterfly while opening ing the strobe light pick up the right cylin fore need not be checked at every tune up the other der If adjustment is necessary loosen the but should be attended to from time to time 1 Run the engine until operating temper 2 Remove the carburetors two small phillips screws which secure the ature is reached points set to its plate and use a small screw 3 Remove the float bowls Remove the 2 Remove the gas tank s rear mounting driver at the pry point provided to move the gasket With the carburetor s positioned bolt and raise the tank fitting a longer fuel 1271

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