Description
Overview:
This Genuine Stihl piston ring is designed for 2‐stroke chainsaw engines and sized at 49 mm diameter x 1.2 mm thickness (1.93 in x 0.05 in). It restores and maintains cylinder compression, helping your saw start reliably, deliver full power, and run efficiently under load. Manufactured to Stihl OEM standards for a precise fit, it works with the MS 311 and MS 391 series. The ring is made from durable, heat‐resistant materials suitable for high‐temperature, high‐RPM operation typical of professional and domestic chainsaw use. Correct sealing from a quality piston ring helps reduce blow‐by, stabilise idle, and protect the piston and cylinder from premature wear, extending overall engine life when used with proper lubrication and maintenance.
Key Features:
- Genuine Stihl OEM part for assured compatibility and performance
- Size: 49 mm x 1.2 mm (1.93 in x 0.05 in) for the correct sealing profile
- Maintains cylinder compression for easier starting and stable power output
- Precision engineering for consistent ring tension and accurate end gap
- Durable construction designed to withstand heat, friction, and fuel mix residues
- Helps reduce blow‐by and oil/fuel losses, supporting cleaner combustion
- Suitable for routine top‐end servicing and straightforward replacement
- Matches OEM tolerances to protect piston and cylinder longevity
- Brand: Stihl; Genuine Part
- OEM references for identification: 1140-034-3001, 11400343001
Typical Applications:
Used during top‐end rebuilds or routine maintenance on Stihl chainsaws when compression has dropped due to ring wear. Ideal for restoring cutting performance, improving cold starts, stabilising idle, and supporting fuel efficiency on saws used for felling, logging, firewood processing, and grounds maintenance.
Also known as:
Engine ring, cylinder ring, compression ring, piston sealing ring. These terms describe the same component that seals the piston to the cylinder wall to maintain compression in a 2‐stroke chainsaw engine.
Fits Models:
MS 311, MS 391, MS311, MS391
Alternate Part Numbers:
1140-034-3001, 11400343001
Product Specifications
| L&S Part No. | 1140 034 3001 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11400343001 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM part ensures compatibility with MS 311 and MS 391 - 49 mm diameter x 1.2 mm thickness for precise sealing - Maintains cylinder compression for reliable starting and power - Heat-resistant materials withstand high-temperature operation - Reduces blow-by, protecting piston and cylinder longevity |
| Fits Models | MS391 |
