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 BR 106, BT 106, FS 106, FR 106 (37mm) [#41290302000]

$33.60

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Piston Kit for STIHL BR 106, BT 106, FS 106, FR 106 (37mm) [#41290302000] and related spare parts.

Details

This listing is about a brand new after-market Piston KitHow to find the size of a piston ring for the following STIHLSpare parts for STIHL machines models, 37mm in diameter, and replaces OEM Part #4129 030 2000:

BR 106
BT 106
FS 106
FR 106

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!