1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 628Get this manual

1996-2006 Yamaha 115-140HP Outboards Service Manuals, Page 628

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Twin barrel carburetor has two independent pilot screwsTherefore all the pilot screws should be adjusted properly when the carburetors are to be adjusted1 Measure: Idle speed Out of spec