Husqvarna K770 Workshop Manual page 28

Vac & dry cut

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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.

If there is no spark, the problem can be a defective

spark plug, defective ignition cable 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.

28 - Repair and servicing

.02 in.

0.5 mm

1. Replace the spark plug with the test spark plug. See

Servicing tools overview on page 14 .

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.

701 - 002 -

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