Description
Overview:
The Piston Ring 40 x 1.2 mm is a genuine Stihl component designed to restore and maintain compression in small two‐stroke engines. Built for durability with a robust metal construction and precision finish, it provides a reliable seal between the piston and cylinder wall to reduce blow‐by and maintain power output. It is sized for a 40 mm cylinder bore with a 1.2 mm ring thickness, matching many Stihl machines including the SP400 and SP450. Using the correct OEM ring helps engines start easily, run smoothly, and deliver consistent performance under load. This ring corresponds to Stihl OEM reference 1123 034 3005 and is suitable for chainsaws, brushcutters, clearing saws and related handheld machinery that use a 40 mm top end.
Key Features:
- Genuine Stihl OEM part for accurate fit and dependable sealing
- Dimensions: 40 mm bore x 1.2 mm thickness for correct ring groove fit
- Restores compression for easier starting and stable idle
- Helps maintain power, fuel efficiency and clean running
- Wear‐resistant construction for long service intervals
- Direct replacement for OEM 1123 034 3005
- Compatible with a wide range of Stihl chainsaws and brushcutters using 40 mm cylinders
- Straightforward to fit during top‐end servicing with basic workshop tools
Typical Applications:
Used during engine overhauls or routine top‐end maintenance to replace worn rings that cause loss of power, difficult starting, excess smoke, or increased fuel use. Suitable for professional and domestic servicing of Stihl chainsaws, brushcutters and clearing saws operating in forestry, landscaping, grounds maintenance and agriculture.
Also known as:
40 mm piston ring, 1.2 mm compression ring, cylinder compression ring, top piston ring, Stihl 40 mm ring, OEM piston ring for 40 mm bore engines.
Fits Models:
021, 023, 025, FR230, FR230T, FR350, FR450, FR480, FR480C, FS120, FS200, FS230, FS250, FS300, FS350, FS380, FS400, FS450, FS480, KA120, KA120R, KA250 Attachment, MS210, MS210C, MS211, MS211C, MS230, MS230C, MS250, MS250C, SP400, SP450
Alternate Part Numbers:
1123 034 3005, 11230343005
Product Specifications
| L&S Part No. | 1123 034 3005 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11230343005 |
| Unit of Sale | 1 |
| Applications | 021, 023, 025, FR230, FR230T, FR350, FR450, FR480, FR480C, FS120, FS200, FS230, FS250, FS300, FS350, FS380, FS400, FS450, FS480, KA120, KA120R, KA250 Attachment, MS210, MS210C, MS211, MS211C, MS230, MS230C, MS250, MS250C, SP400, SP450 |
| Machine Type | Chainsaws, Brushcutters |
| Fits Models | MS230, MS230C | MS250, MS250C | MS211, MS211C | FS120, FS200, FS250 | FS300, FS350, FS380 | FS400, FS450, FS480 | FR230, FR230T | FR350, FR450, FR480, FR480C | 021, 023, 025 | FS230 | KA120, KA120R, KA250 Attachment |
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