2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 118Get this manual

2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 118

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Carburetor 5 Measure the vacuum pressure of carburetor #4 Turn the throttle valve adjusting screws to adjust the vacuum pressure of carburetors #1, #2, and #3 to the same vacuum variation as carbureto