Husqvarna 250 PS Workshop Manual page 31

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Defect
Broken cooling fins, damaged threads or broken
bolt near exhaust port.
Signs of seizing in cylinder barrel
(especially near exhaust port).
Surface coating in cylinder barrel worn through
(especially near top of cylinder).
Piston shows signs of seizing.
Piston ring seized in slot.
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Fit the cylinder with the aid of assembly kit 502 50 70-01
making sure that the opening in the piston ring is in line
with the guide pin. Do not forget the cylinder base
gasket. Tighten the cylinder bolts in diagonal sequence.
Fit the silencer and silencer cover. Bolt the carburettor in
place. Fit the fuel hose, short circuit lead, spark plug and
spark plug cable. Refit the air filter followed by the
cylinder cover.
Remedy
If severe - replace cylinder.
Repair thread with Heli-Coil.
Polish the damaged area with fine emery cloth to
remove seized particles of aluminium. If gouging
is excessive the cylinder and piston must be
replaced.
Replace cylinder and piston.
Polish the damaged area carefully using a fine file
or emery cloth. Polish the cylinder as described
above. If gouging is excessive the cylinder and
piston must be replaced.
Remove the piston ring carefully and clean the
slot thoroughly before refitting. Check piston ring
wear by inserting it into the bottom of the cylinder.
The gap between the ends of the piston ring must
not exceed 0.6 mm.
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