Original Makita piston ring — part no. 021-132-030 — a direct replacement compression ring for the DS340/DCS340 family of two‑stroke chainsaw top‑end assemblies. It’s a precision‑formed metal piston ring made to restore proper cylinder compression and engine performance after wear, scoring or loss of sealing.
Fits engines with a 37 mm piston bore; common compatible models include Makita DCS340 (DS340), DCS330S series (DCS330S‑30 / DCS330S‑35).
Sold as a single, original Makita part (part number 021‑132‑030). Use when performing a top‑end service or piston replacement to regain compression, improve starting and return lost power — install with the correct ring end‑gap and standard ring‑expander tool for a clean fit.
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