Spark Plug Check - Husqvarna SMR 511 2012 I.E. Bedienungsanleitung

ADJUSTING THE IDLE
Adjust the carburettor with warm engine and with the
throttle control in closed position. Proceed as follows:
- turn adjuster screw (1) with a screwdriver until reach-
ing an idle speed of 1,850 - 1,950 rpm, to be detected
by the special diagnosis tester.
WARNING*: Exhaust gas contains poi-
sonous carbon monoxide. Never run the
engine indoors.
SPECIFICATIONS - OPERATION - MAINTENANCE
EN - 26

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 accel-
erating, when idling or poor performance at low speed.
Clean off any dirt around spark plug base before remov-
ing 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.
1
0,7 ÷ 0,8 mm (0,028 ÷ 0,031 in)