Husqvarna 522HD60X Workshop Manual page 43

• Put the piston ring in the cylinder and measure the
space with an air gap tool. The space must not be
more than 1 mm.
• Examine the surface of the piston.
A
Score marks on the pis-
ton (A).
Carbon buildup (B).
Piston ring damage.
1012 - 002 -
B
The carburetor is incor-
rectly adjusted. Too high
engine speed
Too low octane fuel.
Incorrect oil mixture in
the fuel.
The carburetor is incor-
rectly adjusted.
Incorrect oil mixture in
the fuel.
Too high engine speed.
Piston ring worn out.
Too large piston ring
groove.
• Clean and examine the piston ring groove. It must
not be more than 1.6 mm.
• Examine the piston ring play. It must not be more
than 0.15 mm.
7.12.5 To examine the cylinder
• Make sure that the surface layer of the cylinder is
not worn, especially in the top end of the cylinder.
• Make sure that the cylinder does not have score
marks.
Repair instructions - 43