Products Description
MS661 Chainsaw Air Filter – HD2 Replacement Filter & Service Kit
High-Performance Filtration for STIHL MS661 Professional Chainsaws
The STIHL MS661 air filter is a critical component of the engine's intake system, designed to protect the 91.1cc professional powerhead from abrasive dust and debris. The MS661 uses the STIHL HD2 air filter, a premium filter element suitable for all operating conditions. With its fine-pore design, it captures even the smallest particles, ensuring the engine receives clean air for optimal combustion, stable power output, and long service life.
Technical Profiles & Materials
HD2 High-Filtration Media – The HD2 air filter is universally suitable for the MS661 and offers a very high filter quality. Its fine pores effectively trap even the finest dirt and abrasive dust from the intake air, protecting the engine from wear.
Durable Construction – The filter features a robust, impact-resistant plastic frame with a pleated white insert and a reliable sealing edge. This design ensures a long service life and maintains consistent airflow to the carburetor even in demanding conditions.
OEM-Spec Direct Fitment – The genuine STIHL HD2 air filter is designed to exactly fit the MS661, MS661C, and MS661 C-M models. It replaces OEM part number 1144 140 4402, guaranteeing a precise seal and reliable protection.
Available as Part of Service Kit 16 – The STIHL Service Kit 16 for the MS661 includes the HD2 air filter, a spark plug, and a fuel filter. This all-in-one kit simplifies routine maintenance, providing all standard replacement components in one purchase.
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | OEM Part No. | 1144 140 4402 |
| 2 | Alternative OEM Ref. | 1144 140 4400 |
| 3 | Compatible Models | MS661, MS661C, MS661 C-M, MS500i, MS651 |
| 4 | Filter Type | HD2 high-filtration media |
| 5 | Material | Durable plastic frame with pleated insert |
| 6 | Service Kit Ref. | Service Kit 16 (includes air filter, spark plug, fuel filter) |
| 7 | Unit of Sale | 1 |
Products Application
Routine Air Filter Replacement
The HD2 air filter is designed for replacement as part of standard chainsaw maintenance. The STIHL Service Kit 16 provides everything needed for a complete service, including the filter, spark plug, and fuel filter. Regular replacement of these components protects the engine and maintains optimum performance.
Protecting the Engine from Dust and Debris
In dusty forestry and construction environments, the air filter is the primary barrier against abrasive dust. The fine-pore HD2 media captures fine particles that could otherwise enter the engine and cause wear, loss of power, and increased fuel consumption.
Professional Chainsaw Overhaul
When rebuilding or performing a full service on the MS661, replacing the air filter with the OEM 1144 140 4402 ensures the engine is protected from the start. The filter's durable frame and reliable sealing edge make it ideal for demanding professional use.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
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FAQ
Q: How do I confirm which air filter fits my MS661?
A:Check your chainsaw model number on the housing. The MS661, MS661C, and MS661 C-M all use the HD2 air filter with OEM part number 1144 140 4402. This filter is also compatible with the MS651 and MS500i.
Q: What is included in the STIHL Service Kit 16?
A: Service Kit 16 for the MS661 includes the HD2 air filter, a spark plug, and a fuel filter in one package. This provides a complete set of standard maintenance parts for the chainsaw.
Q: What is the advantage of the HD2 air filter?
A: The HD2 filter uses fine-pore media that traps even the finest dirt and abrasive dust. It offers high filtration quality while maintaining consistent airflow, ensuring the engine performs reliably and fuel consumption remains low.
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