Description
Overview:
This genuine Stihl piston is a 39 mm diameter component (1.54 inches) engineered for selected Stihl brushcutters and grass trimmers, including the FS25-4 and FS65-4. Built from a durable aluminium alloy for strength, light weight, and good heat dissipation, it restores correct compression and smooth running when a worn or damaged piston is causing power loss, poor starting, or excessive smoke. The piston works within the matching cylinder bore to transfer combustion forces to the crankshaft via the gudgeon pin. As an OEM part, it offers the correct fit and clearances for reliable operation and long service life. It is suitable for routine maintenance, repair after a seizure or scoring, or as part of a planned engine overhaul to keep equipment dependable on site or in the garden.
Key Features:
- Genuine Stihl OEM part for assured compatibility and performance
- 39 mm diameter (1.54 inches) sized for the correct cylinder bore
- Aluminium alloy construction for strength, low mass, and heat control
- Precision-machined for consistent sealing and efficient combustion
- Direct-fit for the specified models to minimise setup and downtime
- Supports stable idle, easier starting, and reliable cutting performance
- Suitable for professional users and DIY maintenance
- Robust design to withstand typical brushcutter operating loads
- Helps extend engine life when paired with the correct rings and service parts
- Supplied to Stihl quality standards for dependable durability
Typical Applications:
Used during engine rebuilds, scheduled overhauls, or repairs following piston/cylinder wear, scoring, or low compression. Ideal for restoring working power and reliability to Stihl brushcutters used for grass trimming, light brush clearing, and grounds maintenance in domestic, commercial, and site environments.
Also known as:
Engine piston, cylinder piston, replacement piston, piston kit (component), 39 mm piston, trimmer/brushcutter piston, small engine piston.
Fits Models:
FS25-4
FS65-4
Alternate Part Numbers:
4170-030-2011, 41700302011
Product Specifications
| L&S Part No. | 4170 030 2011 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Stihl |
| OEM No. | 41700302011 |
| Unit of Sale | 1 |
| Machine Type | Brushcutters |
| Fits Brands | Stihl |
| Key Features | - Genuine Stihl OEM part ensures compatibility and performance - 39 mm diameter fits specified cylinder bore - Aluminium alloy for strength and heat dissipation - Precision-machined for efficient combustion - Direct-fit for FS25-4 and FS65-4 models |
| Fits Models | FS25-4, FS65-4 |
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