Before Each Use; Ignition System - Husqvarna W21K, W21SK, W21SBK, W53SBEK, W53SEK, W21KC, W21SKC, W21SBKC Operator's Manual

General Recommendations
The warranty on this lawn mower does not
cover items that have been subjected to
operator abuse or negligence. To receive full
value from the warranty, operator must
maintain mower as instructed in this manual.
Some adjustments will need to be made
periodically to properly maintain your unit.
At least once a season, check to see if you
should make any of the adjustments
described in this Maintenance section.
• At least once a year, replace the spark
plug, clean or replace air filter element
and check blade for wear. A new spark
plug and clean/new air filter element
assure proper air-fuel mixture and help
your engine run better and last longer.
• Follow the maintenance schedule in this
manual.

Before Each Use

1. Check engine oil level.
2. Check for loose fasteners.

Ignition System

The engine is equipped with an electronic
ignition system. Only the spark plugs require
maintenance.
For recommended spark plugs, see
Technical Data.
1. Remove the ignition cable boot and
clean around the spark plug.
2. Remove the spark plug with a spark plug
socket wrench.
3. Check the spark plug. Replace the spark
plug if fouled, the electrodes are burned
and if the insulation is cracked or
damaged. Clean the spark plug with a
steel brush if it is to be reused.
4. Measure the electrode gap with a
gapping tool. The gap should be .030"
(0.75 mm). Adjust as necessary by
bending the side electrode.
5. Reinsert the spark plug, turning by hand
to avoid damaging the threads.
6. After the spark plug is seated, tighten it
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English-
MAINTENANCE
IMPORTANT INFORMATION
Fitting the wrong spark plug type can
damage the engine.
Inadequately tightened spark plugs can
cause overheating and damage the
engine. Tightening the spark plugs too
hard can damage the threads in the
cylinder head.
Measure the electrode gap
8011-054