Engine Stops During Operation - No Sparks; Engine Stops During Operation - Husqvarna K770 Workshop Manual

7.2 Engine stops during operation - no sparks

Symptom/Category Cause
Engine suddenly The switch is accidentally set to off
stops
The plug cap is not attached
The switch cable or high-voltage cable is
worn
Internal fault in the coil
The engine has burned out
The air flow filter is blocked
Engine speed gradu- There is no fuel
ally decreases and
There is a blockage in the carburetor
the engine stops
There is water in the fuel
Engine speed sud- There is no fuel
denly increases, and
There is a blockage in the carburetor
then the engine stops

7.3 Engine stops during operation

Remove the spark plug from the cylinder. Hold the
cylinder and pull the starter to see if there are sparks
between the spark plug electrodes.
Symptom/Category Cause
Engine suddenly The engine runs lean
stops
Dirt causes blockage in the air flow. This de-
creases the temperature of the engine
Dirt on the cylinder fin causes blockage
Low quality fuel is used
There is carbon in the combustion chamber
(run-on occurs)
The edge of the spark plug is red hot
Switch The switch is defective
The cable is broken
There is an internal fault in the ignition mod-
ule
651 - 001 - 27.06.2018
There are no sparks at the spark plug
Solution
Set the switch to the left position
Attach the plug cap fully
Replace
Replace
Disassemble and repair
Clean
Fill with fuel
Clean
Empty the fuel tank, clean the inner surface
of the tank and then fill with good quality fuel
Fill with fuel
Clean
Solution
Adjust, repair or replace the carburetor
Clean
Clean
Replace with good quality fuel
Clean
Champion RCJ 6Y/NGK BPMR 7A: Adjust to
0.5 mm
Replace
Replace
Replace
Troubleshooting - 65