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Mercury 40 FourStroke User Manual

Mercury 40 FourStroke
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CARBURETOR
Page 3B-14 90-857046R1 NOVEMBER 2001
Carburetor Adjustments
Float Level
1. With carburetor turned upside down and carb scale seated on inner edge, check float
level from top of float to float bowl flange as shown.
Float Height
0.47-0.63 in. (12.0-16.0 mm)
Idle Speed
NOTE: Outboard should be completely warmed up for the idle speed adjustment.
NOTE: Turning the idle speed adjustment screw clockwise will increase idle speed. Turn-
ing the adjustment screw counterclockwise will decrease idle speed.
1. With the outboard in forward gear adjust idle speed screw to obtain the specified idle
speed.
a
b
a-Idle Speed Screw
b-Phillips Head Screwdriver
Idle Speed (Forward Gear)
800 ± 25 RPM

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Mercury 40 FourStroke Specifications

General IconGeneral
BrandMercury
Model40 FourStroke
CategoryOutboard Motor
LanguageEnglish

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