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 45, 245 R, 245 RX & EPA (42mm) [#503441001]

$40.58

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Piston Kit fit HUSQVARNA 45, 245 R, 245 RX & EPA (42mm) [#503441001] and related spare parts.

Details

This listing is about a BRAND NEW 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:

45 (1987-01)
45 (1988-02)
45 (1988-05)
45 (1989-06)
45 (1990-06)
45 (1991-06)
45 (1995-06)
245 R (1990-01)
245 R (1996-06)
245 R (2001-01)
245 R (2002-08)

245 RX (1990-01)
245 RX (1996-06)
245 RX (2001-01)
245 RX (2002-08)

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