Description
Overview:
This genuine Husqvarna piston ring is a high-quality replacement for 2-stroke engines used in Husqvarna 435 and 440 chainsaws. Made from hardened, wear-resistant steel and manufactured to tight tolerances, it restores and maintains correct cylinder sealing so the engine holds compression under load. Reliable compression supports easy starting, steady idle, strong cutting performance, and consistent fuel efficiency. The ring is engineered to match OEM specifications for groove fit and end-gap when installed with a serviceable piston and cylinder, making it suitable for routine servicing or a top-end refresh. Supplied as a Genuine Husqvarna part, it replaces OEM No. 544 40 59 01 for a direct, like-for-like fit in compatible models.
Key Features:
- Genuine Husqvarna replacement for assured compatibility and reliability
- Direct replacement for OEM No. 544 40 59 01
- Precision-manufactured profile for a consistent seal and stable compression
- Heat-treated steel resists wear, scuffing, and distortion
- Helps restore easier starting, smoother idle, and full power under load
- Exact fit for listed models; no modifications required
- Suitable for routine maintenance or top-end rebuilds after wear
- Designed for use in 2-stroke chainsaw engines
Typical Applications:
Used during maintenance or repair when the engine shows low compression, hard starting, loss of cutting power, or excessive smoke. Ideal after piston and cylinder service or as part of a top-end overhaul on frequently used saws. Suitable for forestry, landscaping, arborist work, construction site cutting, and domestic firewood preparation where these Husqvarna saws are commonly used.
Also known as:
Cylinder ring, engine ring, compression ring, top ring, piston sealing ring. These names refer to the ring that sits in the piston groove to seal the combustion chamber in a 2-stroke chainsaw engine.
Fits Models:
135, 135E, 140E, 435, 435E, 435EII, 435II, 440, 440E, 440EII, 440II, CS410
Alternate Part Numbers:
544 40 59-01, 544405901
Product Specifications
| L&S Part No. | 544 40 59 01 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 544405901 |
| Unit of Sale | 1 |
| Applications | 135, 135E, 140E, 435, 435E, 435EII, 435II, 440, 440E, 440EII, 440II, CS410, Husqvarna 135, Husqvarna 135E, Husqvarna 140E, Husqvarna 435, Husqvarna 435E, Husqvarna 435EII, Husqvarna 435II, Husqvarna 440, Husqvarna 440E, Husqvarna 440EII, Husqvarna 440II, Husqvarna135E, Husqvarna140E, Husqvarna435E, Husqvarna435EII, Husqvarna435II, Husqvarna440E, Husqvarna440EII, Husqvarna440II |
| Machine Type | Chainsaws |
| Fits Brands | Husqvarna |
| Fits Models | 135 | 135E | 140E | 435 | 435E | 435EII | 435II | 440E | 440EII | 440II |
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