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4-13 IGNITION SYSTEM
The ignition system is a transistor controlled magneto
system with the ignition timing set at 23 degrees (EX13/
17/21)[27 degrees (EX27)] before the top dead center.
The magneto consists of a flywheel and ignition coil.
The flywheel (which also works as a fan) is directly
mounted on the crankshaft and the ignition coil is
directly mounted on the crankcase.
Model EX13,17,21 and 27D has a smooth advanced
ignition timing system to improve starting performance.
(For further details, refer to page 48, section
“7. MAGNETO”.)
Fig. 4-10
Fig. 4-11
4-11 LUBRICATION SYSTEM
The rotating parts, sliding parts and valves of the engine
are lubricated with oil in the crankcase. The oil is splashed
onto the parts by the oil splasher on the connecting rod.
4-10 COOLING SYSTEM
The engine uses a forced air-cooling system in which a cooling fan (which also works as a flywheel) forces
cooling air into the cylinder and the cylinder head. Baffles are provided to guide the flow of the cooling air.
(Model EX21 is provided with a synthetic resin cooling fan that is separate from the flywheel.)
4-9 GOVERNOR SYSTEM
This engine is equipped with a centrifugal flyweight type
governor that makes it possible to operate the engine
at a constant speed, even with load variations. (The
governor flyweights are mounted on a governor gear.)
Fig. 4-9
GOVERNOR GEAR
OIL SPLASHE
R
TIMING CHAIN
FLYWHEEL
IGNITION COIL
4-12 TIMING CHAIN
Timing chain system is adopted and designed f or
lubricating for the upper portion of cylinder head.
The timing chain is engaged betw een the sprocket
portion of integrated camshaft in the cylinder head and
the crankshaft gear sprocket.
The sprocket teeth in particular shape are adopted to
enhance the durability and to realize low noise level.