Husqvarna MARK III 540XP Operator's Manual page 230

To do a check of the spark plug
CAUTION:
spark plug. Refer to
237 . An incorrect spark plug can cause
damage to the product.
1. If the product is not easy to start or to operate
or if the product operates incorrectly at idle speed,
examine the spark plug for unwanted materials. To
decrease the risk of unwanted material on the spark
plug electrodes, do these steps:
a) make sure that the fuel mixture is correct.
b) make sure that the air filter is clean.
2. Clean the spark plug if it is dirty.
3. Make sure that the electrode gap is 0.65 mm/0.026
in.
4. Replace the spark plug monthly or more frequently if
necessary.
To sharpen the saw chain
Information about the guide bar and saw chain
WARNING:
when you use or do maintenance on the
saw chain. A saw chain that does not move
can also cause injuries.
Replace a worn or damaged guide bar or saw chain with
the guide bar and saw chain combination recommended
by Husqvarna. This is necessary to keep the safety
functions of the product. Refer to
page 238 , for a list of replacement bar and chain
combinations that we recommend.
• Guide bar length, in/cm. Information about the guide
bar length can usually be found on the rear end of
the guide bar.
230
Use the recommended
Technical data on page
Use protective gloves
Accessories on
• Number of teeth on bar tip sprocket (T).
• Chain pitch, in. The distance between the drive links
of the saw chain must align with the distance of the
teeth on the bar tip sprocket and drive sprocket.
D
• Number of drive links. The number of drive links is
decided by the type of guide bar.
• Bar groove width, in/mm. The groove width in guide
bar must be the same as the chain drive links width.
• Chain oil hole and hole for chain tensioner. The
guide bar must align with product.
D
PITCH =
2
1679 - 006 -