Spark plugs

1. Slacken the fastening screws and remove the ignition coils from the left cylinder head.

5 ÷ 8 Nm
0.5 ÷ 0.8 kgm

27 ÷ 34 Nm
2.8 ÷ 3.5 kgm

• Check cleaning and for any breaks of the ceramic insulant. In this case change the spark plugs.

WARNING: The use of spark plugs with characteristics or sizes other than those specified can cause damage to the engine and alter the level of harmful emissions at the exhaust.

SPARK PLUGS

The standard spark plugs are of the type with surface discharge with a peripheral point and one centre electrode. In order to operate correctly this type of spark plug must have a correct gap between electrodes.

A dirty or burnt spark plug is often a symptom of an engine fault. For example:

• traces of carbon dust: incorrect mixture, air cleaner very dirty;
• oil stains: oil leaks from piston rings;
• formation of ash: presence of aluminium materials in particular in the oil;
• melted electrodes: overheating due to unsuitable fuel, valve defects;
• high electrode wear: harmful additives in the fuel or oil, pinging in the cylinder head, overheating.

• Install new spark plugs tightening them to the specified torque, then complete refitting reversing the sequence followed for removal.

Checking and replacement

• Remove the ignition coils (see specific paragraph).

1. With the engine cold, remove the spark plugs firstly blowing in the recesses to remove any impurity and traces of dirt.