Mercury 40 Service Manual

EMISSIONS
Page 3C-4 90-828631R3 MARCH 1999
STRATIFIED VS HOMOGENIZED CHARGE
DFI engines use a stratified charge inside the combustion chamber to aid in reducing emis-
sions. All other models use a homogenized charge. The difference between the two is:
Homogenized Charge
A homogenized charge has the air/fuel particles mixed evenly throughout the cylinder. This
mixing occurs inside the carburetor venturi, reed blocks and crankcase. Additional mixing
occurs as the fuel is forced through the transfer system into the cylinder. The homogenized
charge is easy to ignite as the air/fuel ratio is approximately 14.7:1.

Mercury 40 Specifications

General

Horsepower	40 hp
Starting System	Electric
Steering	Remote
Fuel Induction System	EFI (Electronic Fuel Injection)
Shaft Length	20"
Full Throttle RPM Range	6000