Husqvarna K770 Workshop Manual page 24

6.2.4 To examine the ignition spark
1. Ground the spark plug against the cylinder.
2. Move the stop button to the operation position.
3. Pull the starter rope handle as if starting.
If there is no spark, the problem can be a defective
spark plug, defective ignition lead or a damaged short
circuit cable. Examine the spark plug.
6.2.5 To examine the spark plug
The electrode gap must be .02 in/0.5 mm.
The electrodes must be free of dirt and oil. Clean with a
wire brush.
Note: An electrode with soft edges and damaged
ceramic around it can cause pre-ignition. You must
replace a spark plug with soft edges.
24 - Repair and servicing
.02 in.
0.5 mm
1. Replace the spark plug with the test spark plug. See
Servicing tools overview on page 12 .
2. Move the stop button to the run position. Ground the
test spark plug. Pull the starter rope handle as if you
start the product.
3. Ground the test spark plug.
4. Pull the starter rope handle as if you start the
product.
If there is a spark, the spark plug is defective. Replace
the spark plug. If there is no spark, examine the ignition
lead and the short circuit cable.
651 - 001 - 27.06.2018