Electronic Control Unit (Ecu); Spark Plug - Husqvarna WRE 125 2011 Workshop Manual

ELECTRICAL SYSTEM

Electronic control unit (ECU)

Remove the saddle as described in Section E to gain access to the electronic
control unit (1).
1
Capacitive injection, i.e the spark on spark plug is obtained thanks to the discharge
of a condenser - positioned inside control unit - through a capacitive coil.
Spark ignites based on an advance table relating to the RPM values and throt-
tle position.
H06654

Spark plug

Spark plug (1) is a "CHAMPION QN84/NGK BR9EG". Check electrode gap "A"
(0.6 mm). A wider gap may cause difficulties in starting the engine and overload
the coil. A gap that is too narrow may cause difficulties when accelerating, when
idling or poor performance at low speed. Clean off any dirt around spark plug
base before removing the spark plug. It is good practice to closely inspect the
1
spark plug after removal, as any deposits on it and the colour of the insulator
provide useful indications on spark plug heat rating, carburetion, ignition and
the general condition of the engine. Before refitting the spark plug, accurately
clean the insulator with a wire brush. Smear some graphite grease on spark
plug thread, do it fully home finger tight then tighten it to 10÷12 Nm torque.
Loosen the spark plug then tighten it again to 10÷12 Nm. Spark plugs which
have cracked insulators or corroded electrodes should be replaced.
H02549
M.14 Ed. 05-2011