Reference: KPD5904704006
Set of 2 segments reference 5904704006 for Scheppach and Woodster 51.7 cm3 garden tools and brushcutters (replaces ref 3904803009) as well as Parkside PBK4B3 manufactured by Scheppach only (incompatible with Grizzly)

The piston rings for 51.7 cm³ garden tools and earth augers – Ref. 5904704006 are fitted into the piston grooves and primarily ensure a proper seal between the piston and the cylinder wall.
They help maintain good engine compression, limit the passage of combustion gases and contribute to the proper operation of the piston-cylinder assembly.
The piston rings for 51.7 cm³ garden tools and earth augers – Ref. 5904704006 may need to be replaced in the following cases:
When replacing the piston rings, it is recommended to also check the condition of the piston and cylinder. A scratched or heavily worn cylinder may prevent new piston rings from providing proper sealing and engine compression.
Piston ring reference to check at item 27 on your exploded view: 3904803009
Set of 2 segments reference 5904704006 for Scheppach and Woodster 51.7 cm3 garden tools and brushcutters (replaces ref 3904803009) as well as Parkside PBK4B3 manufactured by Scheppach only (incompatible with Grizzly)