Husqvarna 2011 SMR449, Руководство по ремонту

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E.25
H02463
1
H02464
2
0,7 ÷ 0,8 mm (0,028 ÷ 0,031 in)
1
st
edition (08-2010) _Rev. 11-2010
GENERAL PROCEDURES
Coil removal and spark plug check
Spark plug electrodes gap shall be 0.7 - 0.8 mm (0.028
÷ 0.031 in)
.
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 very useful to examine the state of the spark plug just after it has been
removed from the engine since the scale deposits on the plug and the colour of
the insulator provide useful indications.
Correct heat rating:
The tip of the insulator should be dry and the colour should be light brown or
grey.
High heat rating:
In this case, the insulator tip is dry and covered with dark deposits.
Low heat rating:
In this case, the spark plug has overheated and insulator tip is vitrified (glazed),
white or grey in colour.
To remove spark plug, proceed as follows:
- remove air filter cover as described in the relevant paragraph;
- disconnect connector (1) on engine left side;
- on engine right side, undo screw (2) using an 8 mm wrench;