3.
FEATURES
Small
in
size, light in weight
The cylinder and crankcase are
of
a one-piece aluminum diecast structure, which
is
light in weight. The dimensions are
reduced as much as possible
for
easy mounting.
Quiet
operation with
low
level
of
vibration
Intake and exhaust noises are reduced by use
of
a newly designed muffler having glass wool and a cyclone cleaner. Ma-
chine noise is reduced by selection
of
a suitable cam shaft profile and optimum clearances
for
inner parts.
All
ths
adds
up
to
a quiet engine. Vibration
is
also reduced
to
a low level by weight reduction
of
reciprocating parts, and selection
of
a timing balancer and optimum balance factor.
Easy
to start
These engines can easily be started because they employ an automatic decompression device and a newly designed re-
coil starter.
Wide range
of
adaptability
These models are available in various types
of
output shafts and also a type (Type
B)
with a built-in
1
/2
reduction gear
for
application to various kinds of machines. The engines have two
oil
drain ports, and their recoil starter can be pulled
in any desired direction. Various optional parts are
also
available. All these combine
to
increase adaptability to machines.
Durable, reliable and safe
A
liner
of
special cast iron, hard-chrome-plate piston rings, forged rod, etc. are used to make these engines as reliable
and durable as the preceding models
of
the
EY
Series. Safety devices are also incorporated to assured added safety.
4.
GENERAL DESCRIPTION
of
ENGINE CONSTRUCTION
4-1
CYLINDER,
CRANKCASE
The cylinder and crankcase are single piece aluminum die
casting. The cylinder liner, made
of
special cast iron, is built
into the aluminum casting. The intake and exhaust ports are
located on one side
of
the cylinder, and are also inserted in-
to
the casing.
The crankcase is separable
on
the output shaft side, where
the main bearing cover is attached to it. (See Fig.
1
.)
Fig.
1
-4-
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