Spark Plug; Removing The Spark Plug; Inspection; Installing The Spark Plug - Malaguti CNK 50 DRAKON Workshop Manual

MANUTENZIO-
FRAME AND RUNNING GEAR
A
5

SPARK PLUG

REMOVING THE SPARK PLUG

• Remove the spark plug cap.
• Unscrew the spark plug (C) with the wrench provided
in the tool kit, and remove it.

INSPECTION

Specified spark plug: NGK BR9ES
The spark plug is an important engine component.
• To service it, simply remove the plug cap and unscrew
the plug with the wrench supplied for this purposes
(take particular care if the engine is hot).
• Examine the condition of the spark plug when the en-
gine is warm, since the deposits and the colour of the
insulator provide useful information about the thermal
rating of the plug, about carburation, lubrication and
the general condition of the engine
• A light tan colour of the insulator around the centre
electrode indicates that engine is correctly function-
ing.
• If the spark plug shows a distinctly different colour, the
engine could be defective. Do not attempt to diagnose
such problems yourself. Instead have a MALAGUTI
Dealer check the vehicle.
• Remove the spark plug and thoroughly clean its elec-
trodes and insulator, using a metal brush. Adjust the
gap between the electrodes with a thickness gauge:
the gap should be 0.6 - 0.7 mm.
Using spark plugs with heat rating other than
the recommended value (as marked on the
plug) can result in serious damage to the
engine.
If the spark plug insulator is cracked and/or
electrodes are corroded it must be replaced
immediately.

INSTALLING THE SPARK PLUG

• Clean the surface of the gasket. Wipe off any grime
from the spark plug threads.
• Install the spark plug with the spark plug wrench, and
then tighten it to the specified torque.
Spark plug tightening torque: 20/25 Nm (2.0/2.5 Kgm)
If a torque wrench is not available when in-
stalling a spark plug, a good estimate of the
correct torque is ¼ - ½ turn past finger tight.
However, the spark plug should be tightened
to the specified torque as soon as possible.
• Install the spark plug cap.
PERIODIC MAINTENANCE
AND MINOR REPAIR
24 03/06
DRAKON 50 NKD
C
05189027
05053573