Fuel Pump; Ignition Coil - Sym Joyride 125 Service Manual

5. Fuel Injection System
Fuel Injector

Fuel Pump

Ignition Coil

5-6
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Powered by DC 8~16V, and has 2 terminals connector on the
•
injector.
Its major component is the solenoid valve of high resistance driven
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by electronic current.
The two terminals are connected to power source and ground
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respective. It is controlled by ECU to determine the injection timing,
and the injector pulse width. Working with 4-valve engine, the unique
2-hole designed injector can provide each intake valve with suitable
fuel quantity to reduce HC emission.
Powered by DC 8~16V, and has 2 terminals connector on the pump.
•
The two terminals are connected to power source and ground
•
respective. The ECU is to control and manage the operation of fuel
pump through electrical power.
Its major component is a driving fan pump that equipped with a low
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electrical consuming DC motor. Powered by 12V voltage and keep
fuel pressure inside the fuel pump in 2.5 bars, which can offer 14
liters of fuel per hour.
The fuel pump is located inside of the fuel tank, and installed a filter
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in front of its inlet so that can prevent from foreign materials sucking
into the fuel pump to damage it and the fuel injector.
Powered by DC 8~16V, and has 2 terminals connector on the coil.
•
The two terminals are connected to power source and ground
•
respective. Its major component is the high transferring rate
transformer.
Its ignition timing is controlled by computer program. From the
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signals of crankshaft position sensor, throttle position sensor, and
engine temperature sensor as well as intake air temperature sensor,
and correspondence with engine speed, then the ECU determines
the ignition timing properly by means of controlling primary current in
ON & OFF operation to create the secondary voltage of
25000~30000V. And then, the voltage triggers the spark plug ignition.
Such kind of ignition system not only can enhance engine
performance to maximum, but also increases fuel consumption
efficiency and improves emission quality.