Husqvarna 545 Mark II Workshop Manual page 59

8.18.4 To examine the inlet pipe
1. Remove the 4 screws and remove the inlet pipe
from the cylinder.
2. Remove the flange and support sleeve from the inlet
pipe.
3. Examine the parts for damage. Replace damaged
parts.
8.18.6 Piston damages
Score marks on the piston
Incorrect carburetor setting. Too high speed.
Too low octane fuel.
The fuel has a too low octane grade.
Carbon build-up
Incorrect carburetor setting. Too low speed.
Too much or incorrect oil in the fuel.
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8.18.5 To examine the piston
1. Make sure that the piston pin bearing is not
damaged.
2. Make sure that the piston pin does not have
damages on the running surface for the bearing.
3. Make sure that the piston ring can move freely in the
groove.
4. Put the piston ring in the cylinder and measure the
ring gap with a feeler gauge. The space must not be
more than 1 mm.
Repair instructions - 59