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 FS490C, FS491C, FS510C, FS511C (44.7mm) [#41480302002] by METEOR

$59.54

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Piston Kit for STIHL FS490C, FS491C, FS510C, FS511C (44.7mm) [#41480302002] by METEOR and related spare parts.

Details

This is a brand new Piston KitHow to find the size of a piston ring in its original package for the following STIHLSpare parts for STIHL machines models, made by METEOR, with diameter 44.7mm, which replaces OEM Part #4148 030 2002: