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 STIHL 039, MS390 - MS 390 (49mm) [#11270302005] by METEOR

$39.13

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Piston Kit for STIHL 039, MS390 - MS 390 (49mm) Chainsaws [#11270302005] by METEOR and related spare parts.

Details

This listing is about a brand new after-market Piston KitHow to find the size of a piston ring made by METEOR (Italy) for the following STIHLSpare parts for STIHL machines models, 49mm in diameter, which replaces OEM Part #1127 030 2005:

039
MS 390

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