Driving Shaft (For Model B Only); Cylinder; Cylinder Head; Governor - Robin EC05-2 Service Manual

4-6 DRIVING SHAFT (P.T.O. shaft) (for
Model B only)
The driving shaft is made of forged carbon steel and reduction gear
i s
force-fitted.
4-7 CYLINDER
'Model EC05-2, EC07-2
Monoblock cylinder and cylinder head
.is made of aluminum alloy diecasting and-inside the cylinder
is treated with
hard-chromium plating to withstand against the wear by reciprocal motion of the piston.
Outside fins of cylinder-head are arranged to get efficient heat dispersion and provided with threaded hole for mounting a
spark plug on the top.
Inside the cylinder, one each of intake port, exhaust port and two scavenging ports are positioned to get the maximum
engine performance.
-.
Model ECIO, EC17
The cylinder is made
of
precision-casted wear-resistant cast iron provided with fins for perfect heat dispersion.
Inside the cylinder, one each of intake
port,
exhaust port and two scavenging ports are positioned to get the maximum
engine performance.
The cylinder is attached to the crankcase with the flange, which positioned lower part of cylinder, by stud-bolts.
*Model EC25-2
The cylinder with the cylinder liner
is
made of aluminium alloy. The cylinder liner
is
made of special cast iron and are
im-
bedded in the aluminium casting as inserts. Inside the cylinder, one each of intake port, exhaust port and four scavenging
ports are positioned
to
the maximum engine performance.
4-8 CYLINDER HEAD (Model ECIO, 17,25-2 only)
The cylinder head is made of heat-conductive aluminum alloy and is provided with the fins, arranged in the direction of
cooling air to achieve the efficient cooling.
The combusion chamber forms semi- spherical and is provided with threaded hole for mounting a spark-plug on the top.
4-9 GOVERNOR
The centrifugal flyweight type governor assures constantspeed operation at selected speed, irrespective of load fluctuations.
(The governor is built-in the crankcase for Model EC05-2,07-2) As to the detail, refer to section "8. GOVERNOR".
4-10 COOLING
The cooling fan which also serves as a flywheel forcily feeds cooling air to the cylinder and cylinder head with the aid of
blower housing and air buffle.
4-11 IGNITION
The ignition system is of flywheel magneto type with ignition timing set at
23"
before TDC for EC05-2, 07-2, 25-2, 18" be-
fore TDC for EC10 and 22" before TDC for EC 17 respectively.
The flywheel with steel magnet piece revolves outside the coil and generates the electric power
in
the coil. The flywheel also
equalize the engine revolution and at the same time, it serves as a blower, with its impellers on the circumstance, for cooling
the engine. The igntition coil and t h e breaker are mounted in the crankcase.
As to the detail, refer to "Section 7 . MAGNETO".
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