Repair manual

10 Maintenance

102 Replacing the spark plug

1. Ignition test

• Insert the combination wrench (3) between the hood and cylinder, as shown

in the figure.

• Press the unscrewed spark plug (2), with the spark plug terminal cap firmly

attached, against the wrench using insulated pliers (away from the spark plug

hole!).

• Press the multifunction switch (1) to the "I" position.

• Pull out the starter rope firmly.

• If the spark plug is functioning properly, you must see a spark plug between

the electrodes.

CAUTION

Do not insert the wrench into the spark plug hole; just make contact with the cyl-

inder (otherwise you may damage the engine).

Spark plug

picture

Appearance Normal view Deposits Overheating Carbon deposits

Cause Proper spark

plug

Good

combustion

Incorrect

thermal value

Incorrect spark

plug

Incorrect thermal

value

Poor quality,

material wear