Spark plugs

1. Slacken the three fastening screws and remove the rotary brush.
2. Remove the protection.
3. Slacken the two fastening nuts and remove the ignition distributor body.

18 ÷ 22 Nm
1.8 ÷ 2.2 kgm

SPARK PLUGS

The standard spark plugs installed are of the surface discharge type with four peripheral points and a centre electrode.

In order to operate correctly the gap between the peripheral points and the centre electrode must be correct.

25 ÷ 34 Nm
2.5 ÷ 3.5 kgm

CHECKING AND REPLACEMENT

• With the engine cold, remove the spark plugs, firstly blowing inside the spark plug openings to remove any impurities and traces of dirt.
• Check the spark plugs for dirt and the ceramic insulation for breaks. In this case replace the spark plugs.

The use of spark plugs with different characteristics or sizes than those specified can cause serious damage to the engine and change the level of harmful emission at the exhaust.

A dirty or worn out spark plug is often the sign of a failure in the engine supply system. For example:

• Traces of carbon dust: incorrect mixture, air cleaner very dirty.
• Spots of oil: oil leaking from the piston rings.
• Formation of ash: presence of aluminium materials, contained in the oil.
• Burnt electrodes: overheating due to unsuitable fuel, defects in the valves.
• High electrode wear: harmful additives in the fuel or in the oil, pinging in the cylinder head, overheating;
• Etc.

• When installing tighten the spark plugs to a torque of: