Husqvarna 50 Workshop Manual page 51

Remove the wrist pin needle bearing from the connecting
rod.
Fault
Broken cooling fins, damaged In serious cases - change the
threads or broken screw at
the exhaust port.
Seizure marks in the cylinder Grind the damaged spot with a fine
wall (especially at the exhaust emery cloth so that the adhered
port).
Surface coating in the cylinder Exchange the cylinder and piston.
wall worn (mainly at the top
of the cylinder).
The piston has seizure marks. Carefully grind the damaged spot
The piston ring is stuck in its
groove.
Assembly
Clean the cylinder base to crankcase contact surfaces
making sure that all used gasket material is removed.
Position the new cylinder base gasket on the crankcase.
A small amount of grease maybe applied to hold the
gasket in place. Lubricate the wrist pin needle bearing
with oil and insert the bearing into the connecting rod
small end.
Remedy
cylinder. Repair the thread
HeIi-Coil-inserts.
aluminum disappears. When
deeper seizure scratches occur,
the cylinder and piston should be
exchanged.
with a fine file or a emery cloth.
Before the piston is reassembled,
the cylinder should be grinded, as
above. When deeper scratches
occur, the piston should be
exchanged and also the cylinder,
if necessary.
Loosen the piston ring carefully
and clean the groove very carefully
before reassembly. Check the
piston ring for wear by placing it in
the bottom part of the cylinder.
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