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 545, 550 XP, 550XPG X-TORQ AutoTune (43mm) [#577047006]

$30.83

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Piston Kit for HUSQVARNA 545, 550 XP, 550XPG X-TORQ AutoTune (43mm) Chainsaws [#577047006] 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, 43mm in diameter, which replaces OEM Part #577 04 70-06:

545 X-TORQ AutoTune

550 XP X-TORQ AutoTune
550 XPG X-TORQ AutoTune

Be Good to your HUSQVARNA. Avoid poor-quality parts!

This high-performance Piston Kit comes directly from a top-quality ISO-certified Manufacturer.
This top-quality Piston Kit is covered by a 2-year warranty.
No Exporters - No Intermediaries You buy at a competitive price, because we buy directly from the source!