How to Adjust Yamaha 40hp Idle

How to adjust Yamaha 40hp idle refers to the process of altering or modifying the outboard motor’s carburetor so that it causes the 40 horsepower boat engine to run smoothly while either disconnected from a load or when the outboard motor is out of gear. What does it mean to adjust the carburetor’s idle speed? Adjusting the Yamaha 40 hp carburetor is the act of balancing a device, known as the carburetor, in a outboard’s internal combustion engine. The carburetor’s job is to mix air with a fine spray of liquid fuel, also known as gasoline, so that the outboard engine runs smoothly like when it did new from the factory. Engine idle speed adjustment 40hp Yamaha 2-Stroke, 3-cylinder models - procedures It is recommended you adjust the throttle link before adjusting the idle speed. Start making adjustments by measuring the idle speed with a tachometer. To do that, start up the 40hp motor and allow it to warm up to normal operating temperatures, which should take a few minutes. Once warmed attache the tach to cylinder number 1 high tension lead. The idle speed should measure 800 rpm. If our of spec, adjust. To adjust loosen the throttle valve stop screw, see video for diagram, and fully close the throttle valve. Next loosen the throttle lever securing screws, see video for illustration, of middle and upper carburetors by rotating the screws clockwise. Now fire up the motor and allow it to warm up again. Attach the tach to cylinder number one high tension lead. Start making adjustments to the throttle stop screw. Turing in increases the idle, turning out decreases idle speed. While lightly pushing the 40hp motor’s throttle lever of the lower carburetor in the direction of the arrow (full-closed), tighten the throttle lever securing screw of the upper and middle carburetors by turning the screws counterclockwise. Searches related to Yamaha 40 hp engine idle speed adjustment How to adjust the idle Yamaha 40 hp Where is the idle adjustment screw on 2007 Yamaha 40hp How to adjust idle RPM procedures 2006 Yamaha 40 horsepower How to lower idle speed on 40hp 2005 Yamaha outboard How to set timing and cab 40 hp Yamaha 2004 Tune up carburetor 2003 40 hp four stroke Outboard idles rough after adjusting 2002 4-stroke idle How to adjust air fuel mixture 2-stroke 40hp Yamaha 2001 Applicable models 2003 2005 2004 2007 2006 40hp models and 2008 2002 2000 2001 21999 1998 models. It doesn’t apply to the following models but there is a manual that gives info for the following models 40ELRW, 40ESRW, 40MLHW, 40MSHW, 40TLRW, P40EJRW, 40EJRX, 40ESRX, 40MJHX, 40MLHX, 40MSHX, 40TLRX, C40TLRX, F40TLRX, F40MLHC, F40MSHC, F40TLRC, 40TLRD, F40EJRD, F40MJHD, F40MLHD, F40MSHD, F40TLRD, 4OTLR, F40EJR, F40MJHA, F40TLR 40MJHY, F40ESRY, 40TLRY, F40MSHY, C40TLRY, F40TLRY, 40TLRZ, F40MJHZ, F40TLRZ, 40MJHZ, C40TLRZ, F40MLHZ, 40MLHZ, F40ESRZ, F40MSHZ, 40TLRA, F40MJHA, F40TLRA, F40MLHA, C40TLRA, F40ESRA, F40MSHA, 40TLRB, F40ESRB, F40EJRB, F40MJHB, F40MLHB, F40MSHB, F40TLRB, 40TLRC, F40EJRC, F40MJHC. 008 Yamaha 40hp 3-cylinder carb adjustment