4-6
VALVE ARRANGEMENT
The exhaust valve is positioned
in
the
upstream side of the cooling air with the result that the
exhaust valve
is
intensively cooled for engine life improvement.
-
4-7
CYLINDER
HEAD
A
Ricardo type combustion chamber
of
ample area is employed for good combustion efficiency.
The spark plug
is
mounted obliquely to facilitate fuel tank mounting.
4-8
GOVERNOR
The flyweight type governor effectively operates to maintain
the
selected speed at varying
load.
The model
EY14, EY18-3
and
EY23
engine
is
equipped with a separate gearing for the governor
to
secure better performance.
4-9
COOLING
Cooling is accomplished
by
a
flow
of air circulated past the cylinder walls and head
fins
from a
combination fan-flywheel. The air
is
guided
by
a cylinder buffle
and
a head cover. The
EY14,
EY18-3,
EY23,
EY25-2
and
EY27-2
engines are equipped with curved vane fans made
in
two
modifications, each
for
direct drive and reduction drive engines.
4-10
LUBRICATION
Lubrication for rotating and sliding parts is accomplished
by
scooping and splashing the
oil
in
the crankcase
with
oil scraper attached to connecting rod.
4-11 IGNITION
The ignition system
is
of the flywheel magneto type
with
the ignition timing set
230
before
T.D.C. The magneto comprises a flywheel, ignition coil and a breaker, of which the flywheel
(serving also as a fan)
is
mounted on the crankshaft and the two other members are mounted
directly
in
the crankcase. (for details, refer
to
7.
MAGNETO
section)
The model
EY23
engine normally incorporates an electronic ignition system.
4-12 CARBURETOR
A
horizontal draft carburetor
is
employed. Its setting has been carefully determined after
through testing to achieve best starting, accelerating, fuel consumption, output and other
performances.
For
other details such as construction, refer to
9.
CARBURETOR
section.
4-13
AIR
CLEANER
The model
EY
14,
EY18-3
and
EY23
engines are equipped with an oval air cleaner incorporating
8
sponge element.
The cycl.one type air cleaner with a semi-wet double element is optional.
The
model
EY25-2,
EY27-2
engines are equipped
with
an
cyclone type semi-wet double element
air cleaner.
-5-
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