How can I determine whether my cylinder is reusable so as to replace just the piston?

The most common problem of a cylinder that needs replacement is in case there are scratches into the surface of the tube where the piston runs.

What other parts I may need to replace on my machine when replacing the piston?

To replace the piston you need to disassemble the engine, so you also need to replace the cylinder gasket, at least. Also, it is recommended to check the piston bearing.

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Piston Kit for HUSQVARNA 345, 345 e, 346 XP & EPA (42mm) [#503907371]

$39.05

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Piston Kit fit HUSQVARNA 345, 345 e, 346 XP & EPA (42mm) Chainsaws [#503907371] and related spare parts.

Details

This listing is about a brand new after-market Piston KitHow to find the size of a piston ring in its original package for the following HUSQVARNASpare parts for HUSQVARNA machines models, 42mm in diameter:

345 (1998-08)
345 (1999-09)
345 (2001-09)
345 (2003-01)
345 (2004-03)
345 (2007-01)
345 e (2005-05)
345 e (2006-06)
345 EPA (1999-09)
345 EPA (2001-09)
345 EPA (2003-01)
345 EPA (2004-03)
346 XP (1999-01)
346 XP (1999-03)
346 XP (2001-06)
346 XP (2003-06)
346 XP (2004-03)
346 XP (2007-02)
346 XP (2007-04)
346 XP (2007-08)
346 XP (2009-02)
346 XP (2011-01)

346 XP EPA (2004-03)

Our Piston Kits are branded and come directly from the top-quality Manufacturer METEOR.
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Protect your valuable HUSQVARNA machine. Use only Branded & High−Quality Parts. Better Safe than Sorry!