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4-14 CARBURETOR
The engine is equipped with a hor izontal draft
carburetor. The carburetor setting is calibrated after
careful testing for optimum all-round performance
(including starting, acceleration, fuel consumption,
output power characteristics). Special attention is also
paid to the general-purpose use of the engine. (For
further information, refer to page 57, section “11.
CARBURETOR”.)
4-15 AIR CLEANER
The engine uses an air cleaner that is quieter than
conventional ones. A semi-wet urethane foam element
is used in the STD air cleaner. Dual element air cleaner
(with a primary element of d ry type sponge and
secondary element of dry type paper) and other types
are also provided as special options.
4-16 BALANCER
(PROVIDED ONLY IN MODEL EX27D)
Unbalanced inertia force is cancelled by the balancer
which rotates at the same speed as the crankshaft to
effectively reduce vibration.
4-17 DECOMPRESSION SYSTEM
The automatic decompression system is mounted on
the camshaft. It opens the exhaust valve before the
compression top, thereby alleviating the compression
pressure and reducing the force required to pull the
recoil starter.
During engine operation, the decompression system is
overpowered by centrifugal force and compression is
fully utilized to produce power.
CLEANER
COVER
CLEANER
COVER
URETHANE
FOAM
URETHANE
FOAM
STD Type Dual Element Type
PAPER
ELEMENT
Fig.4-12
Fig.4-13
Fig.4-14
Fig.4-15
EXHAUST
VALVE
ROCKER ARM
(EXHAUST VALVE SIDE)
RETURN SPRING
CAMSHAFT