Description
Overview:
This Genuine Husqvarna piston ring (MPN 503 28 90 05 / 503289005) is a high-precision steel ring designed to restore and maintain cylinder compression in two‐stroke Husqvarna chainsaw engines. It creates a reliable gas seal between the piston and cylinder wall, helping your saw start easily, idle smoothly, and deliver consistent power under load. Made from durable, heat‐resistant steel alloy, it is built for the harsh conditions found in forestry, landscaping, and site work. Ideal for routine overhaul or repair, it provides an exact OEM fit for a wide range of Husqvarna machines, including popular models such as the 242 and 345. Using a genuine ring protects the cylinder from premature wear and supports long engine life when matched with correct lubrication and maintenance.
Key Features:
- Genuine Husqvarna OEM part for exact fit and compatibility
- Restores correct compression for easier starting and stable idle
- Supports full power output and throttle response under load
- Durable steel construction withstands high temperature and friction
- Manufactured to precise clearances for reliable sealing and low blow‐by
- Helps reduce fuel waste and exhaust smoke when the engine is in good order
- Smooth running improves cutting efficiency and control
- Suitable for routine service or top‐end rebuilds
- Straightforward to fit for experienced DIY users and professionals
- Matches the original ring profile to protect the cylinder and piston
Typical Applications:
Replacement of worn or damaged piston rings during service, rebuilds, or troubleshooting loss of compression on Husqvarna chainsaws used in arboriculture, forestry, landscaping, construction sites, and firewood processing. Helps restore starting performance, power, and fuel efficiency after heavy use or when symptoms such as hard starting, low power, or excessive exhaust smoke appear.
Also known as:
Piston compression ring, cylinder ring, engine ring, top ring, sealing ring for piston assemblies in two‐stroke chainsaw engines. These terms all refer to the same component whose job is to maintain combustion pressure and control blow‐by in the cylinder.
Fits Models:
240, 242, 245, 245R, 245RX, 246, 340, 343FRM, 345, 345R, 346XP, 350, 356XP, 40, 42, 45, 49
Product Specifications
| L&S Part No. | 503 28 90 05 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 503289005 |
| Unit of Sale | 1 |
| Applications | 240, 242, 245, 245R, 245RX, 246, 340, 343FRM, 345, 345R, 346XP, 350, 356XP, 40, 42, 45, 49 |
| Machine Type | Chainsaws |
| Fits Brands | Husqvarna |
| Fits Models | 340 | 242 | 246 | 345 | 346XP | 350 | 40 | 42 | 45 | 49 | 240 | 245 | 245R | 245RX | 345R | 343FRM |
