Description
Overview:
The Piston Ring 47x1.2 mm for Stihl MS311, MS391 (part no. 1140 034 3000) is a genuine Stihl component designed to restore and maintain compression in two‐stroke engines used in chainsaws and clearing saws. Made from high‐grade steel for strength and wear resistance, it seals the gap between the piston and cylinder to support reliable starting, steady idling, and full power under load. The ring measures 47 mm (1.85 in) in diameter by 1.2 mm (0.05 in) in thickness for a precise fit on compatible engines. It is a direct replacement for worn or damaged rings and is suitable for routine top‐end maintenance on models such as the MS 311 and MS 391. Built to OEM standards for consistent performance and longevity.
Key Features:
- Genuine Stihl OEM part for assured compatibility and reliability
- 47 mm (1.85 in) x 1.2 mm (0.05 in) sizing for an accurate, gas‐tight seal
- Helps restore and maintain engine compression, power, and fuel efficiency
- Durable steel construction for long service life under demanding use
- Supports easier starting and stable idle after overhaul or service
- Precision fit reduces blow‐by and oil/fuel contamination in the cylinder
- Suitable for a range of mid‐size Stihl chainsaws and clearing saws
- Ideal as a direct replacement during piston/cylinder maintenance
Typical Applications:
Used during engine rebuilds or scheduled maintenance to replace a worn compression ring on Stihl two‐stroke machines. Common for restoring performance on chainsaws used for felling, pruning, and firewood, and on clearing saws for forestry and vegetation management. Helps recover lost power, reduce smoke from poor sealing, and improve starting and throttle response.
Also known as:
Piston compression ring, engine compression ring, cylinder ring, engine piston ring, sealing ring for piston.
Fits Models:
FS 490 C, FS 510 C, FS 560 C, MS 271, MS 271 C, MS 291, MS 291 C, MS 311, MS 361, MS 361 C, MS 362, MS 362 C, MS 391
Alternate Part Numbers:
1140-034-3000, 11400343000
Product Specifications
| L&S Part No. | 1140 034 3000 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 11400343008 |
| Unit of Sale | 1 |
| Machine Type | Chainsaws, Brushcutters |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM part ensures compatibility and reliability - 47 mm diameter, 1.2 mm thickness for precise fit - Durable steel construction for long service life - Suitable for Stihl MS311, MS391 chainsaws - Restores engine compression and power efficiency |
| Fits Models | MS361, MS361C | MS362, MS362C | FS490C, FS510C, FS560C | MS271, MS271C, MS291, MS291C | MS311 |
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