Description
Overview:
This genuine Stihl piston ring is designed for 38 mm cylinder bores with a 1.2 mm ring thickness (approximately 1.50 in diameter and 0.05 in thick). Made from hardened steel for high wear resistance, it restores a reliable seal between the piston and cylinder in two‐stroke petrol engines used across handheld garden and construction tools. By maintaining a tight seal, it helps sustain engine compression, stable idle, and consistent power output. It is suitable for a wide range of Stihl machines and is commonly fitted to models such as KM 90 and KM 90 R. The precise sizing and OEM specification support dependable performance and longevity when servicing or rebuilding compatible engines.
Key Features:
- Genuine Stihl OEM component for assured fit and function
- Dimensions: 38 mm diameter (approx. 1.50 in) x 1.2 mm thickness (approx. 0.05 in)
- Hardened steel construction for durability and wear resistance
- Helps restore and maintain correct engine compression and power
- Supports easier starting and smoother running when the old ring is worn
- Precision-ground profile to suit the piston groove and 38 mm bore
- Suitable for many Stihl trimmers, hedge trimmers, edgers, and KombiEngines
- Ideal for top‐end refresh during routine maintenance or repair
- Designed to OEM tolerances; check bore size and end gap during fitting
- Reliable choice for both trade users and DIY maintenance
Typical Applications:
Replacement of a worn or damaged ring during top‐end servicing on Stihl handheld equipment, including brushcutters, strimmers, hedge trimmers, edgers, and KombiEngine powerheads. Used to recover compression after heavy use, poor starting, loss of power, or visible scoring/wear. Suitable for regular maintenance schedules to keep equipment running efficiently in landscaping, grounds care, site work, and property maintenance.
Also known as:
Engine ring, cylinder ring, compression ring, top ring, sealing ring for 38 mm bore engines. Common terminology varies by workshop, but all refer to the component that seals the piston to the cylinder wall to control blow‐by and maintain pressure.
Fits Models:
FC 90, FC 91, FC 95, FC 96, FS 83, FS 83 T, FS 87, FS 87 R, FS 89, FS 89 R, FS 90, FS 90 R, FS 91, FS 91 R, HL 90, HL 90 K, HL 95, HL 95 K, KM 90, KM 90 R, KM 91 R, SP 90, SP 90 T
Alternate Part Numbers:
4180-034-3002, 41800343002
Product Specifications
| L&S Part No. | 4180 034 3002 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41800343002 |
| Unit of Sale | 1 |
| Machine Type | Brushcutters, Pole Pruners, Edging Trowel |
| Key Features | - Fits 38 mm cylinder bores, 1.2 mm ring thickness - Made from hardened steel for wear resistance - Suitable for Stihl KM 90, KM 90 R models - Restores engine compression and power - OEM specification ensures reliable performance |
| Fits Models | FS83, FS83T | FS90, FS90R | FS91, FS91R | FS89, FS89R | KM90, KM90R | KM91R | FC 90, 95 | FC 91, 96 | HL90K, HL90, HL95K | HL 95, HL 95 K |
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