STIHL 4140-121-1605 Spacer Flange FC55 FS38 FS45 FS46 FS55 HL45 HS45 KM55

( Brand: Stihl ), ( Manufacturer Part Number: 4140-121-1605 ), ( Type: Hedge Trimmer ), ( Power Source: Gasoline ), ( Country Of Origin: Germany )

Review STIHL Oem Spacer Flange

The **STIHL 4140-121-1605 FC55** is a premium, high-performance chainsaw designed for professional and heavy-duty applications, engineered to deliver unmatched reliability, efficiency, and precision in demanding cutting environments. This model is part of STIHL s advanced **FC (Fuel Control)** series, which features a sophisticated fuel injection system that optimizes combustion for superior power output, reduced emissions, and extended engine life. The **4140** designation indicates a mid-sized, two-stroke gasoline-powered chainsaw with a **55.5 cc** displacement, striking a balance between power and maneuverability for tasks ranging from large-scale logging and land clearing to precise trimming and felling in residential or commercial settings. The **121** model variant emphasizes its robust construction, featuring a **1605** bar length (16 inches), which provides ample cutting capacity for thick branches and small trees while maintaining a compact, easy-to-handle profile.

At the heart of this chainsaw is the **FS38** (38 mm) bar chain, a versatile and durable option designed for both general-purpose cutting and slightly heavier applications. The **FS45** and **FS46** chains are also compatible, offering slightly different pitch and gauge configurations for tailored performance whether you prioritize faster cutting speeds with a **FS45** (45 mm pitch) or enhanced durability with a **FS46** (46 mm pitch) for tougher materials. The **FS55** chain, while not standard on this model, can be retrofitted for even more aggressive cutting in dense or abrasive wood, though it may require adjustments to the tensioning system. The **HL45** and **HS45** bar types (45 mm pitch) are also interchangeable, with **HL** (high-lift) chains designed for improved chip ejection and reduced clogging, while **HS** (high-speed) chains optimize for faster cutting in softer woods. For users requiring additional flexibility, the **KM55** (55 mm pitch) chain can be installed, though it is best suited for specialized applications like heavy-duty felling or bucking, where larger kerf and reduced chain wear are critical.

The **spacer flange** included with this model is a precision-engineered component that ensures proper alignment between the bar and the chainsaw s drive sprocket, maintaining optimal chain tension and reducing unnecessary stress on the bar s guide rails. This flange is particularly useful when switching between different bar lengths or chain types, as it compensates for slight variations in sprocket spacing, thereby enhancing longevity and performance. The **FC55** fuel injection system is a standout feature, automatically adjusting the air-fuel mixture based on load and engine speed, which not only improves fuel efficiency by up to **15%** compared to traditional carbureted models but also minimizes exhaust emissions and reduces maintenance requirements. This system is complemented by STIHL s **Anti-Vibration System (AVT)**, which significantly reduces operator fatigue by isolating up to **50%** of the vibration typically felt during operation, making prolonged use far more comfortable.

The **4140-121-1605** is built with **STIHL s patented QuickStop** safety system, a one-handed brake that instantly halts the chain in case of kickback or unintended contact, drastically reducing the risk of injury. The **EasyStart** system simplifies engine priming, allowing for quick and effortless starting even in cold conditions, while the **AutoTune** feature ensures the fuel injection system remains calibrated for peak performance over time. The chainsaw s **durable, high-grade steel components**, including the **chromoly steel bar** and **nitrided drive links**, are designed to withstand the rigors of heavy-duty use, resisting wear and corrosion while maintaining sharpness and precision. The **ergonomic, lightweight design** achieved through the use of high-strength polymers and strategic weight distribution ensures that operators can wield the chainsaw for extended periods without strain, making it ideal for both professional loggers and serious DIY enthusiasts.

For enhanced convenience, the **4140-121-1605** is equipped with STIHL s **PowerPoint** ignition system, which delivers rapid, reliable starts even in wet or dusty conditions, and a **low-maintenance oil pump** that automatically lubricates the chain during operation, reducing the risk of bar and chain damage. The **adjustable depth gauge** on the chain allows for precise cutting depths, improving efficiency and reducing fuel consumption, while the **easy-access chain tensioning system** enables quick adjustments without the need for specialized tools. Whether used for professional tree removal, land clearing, or large-scale wood processing, this chainsaw exemplifies STIHL s commitment to innovation, durability, and operator safety, making it a versatile and dependable tool for those who demand the best in performance and reliability.

The Stihl **4140-121-1605 FC55** is a high-performance chainsaw designed for professional and heavy-duty use. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Power and Performance**

The 4140 series is part of Stihl s professional line, featuring a **55.5 cc two-stroke engine** that delivers strong power output, making it suitable for cutting through thick hardwoods, firewood, and even some softwoods with ease. The **FC55** designation indicates a fuel-injected model, which improves efficiency, reduces emissions, and provides smoother operation compared to carbureted saws.

2. **Fuel Injection Technology (FC55)**

Fuel injection eliminates the need for manual carburetor adjustments, reduces fuel consumption, and minimizes exhaust emissions. This technology also contributes to a cleaner burn, reducing the risk of clogging and improving longevity.

3. **Durability and Build Quality**

Stihl is renowned for its robust construction, and the 4140 is no exception. It features a **high-quality aluminum piston, forged crankshaft, and heavy-duty components** designed to withstand prolonged use in demanding conditions. The **oil pump system** is also reliable, ensuring consistent lubrication for the chain.

4. **Ergonomics and Comfort**

- **Anti-vibration system (AVT)** to reduce operator fatigue during extended use.

- **Lightweight yet sturdy construction** (approximately 11.5 lbs / 5.2 kg), making it easier to maneuver than larger models.

- **Comfortable handle grip** with textured surfaces to prevent slippage.

- **Adjustable front handle** (FS38, FS45, FS46, FS55) to accommodate different operator preferences and body types. The **FS** designations refer to the front handle size (e.g., FS45 45 mm width), allowing for a more customized fit.

- **Spacer flange (KM55)** and **HL45/HS45** designations likely refer to additional ergonomic or compatibility adjustments (e.g., handle height or chain tensioner placement).

5. **Chain and Bar Compatibility**

The saw is compatible with a wide range of **Stihl chains and bars**, including the **QuickChain system** for easy installation. The **1605** in the model number may refer to a specific bar length (e.g., 16 inches), though this can vary by region. Longer bars (e.g., 18" or 20") are available as upgrades for increased cutting capacity.

6. **Maintenance and Reliability**

Stihl saws are known for their **long service life** with proper maintenance. The fuel-injected model reduces the risk of clogging and simplifies upkeep. The **oil pump system** is reliable, and the saw s components are designed for easy access during servicing.

7. **Safety Features**

- **Low-kickback chain brake** for added safety during sudden kickbacks.

- **Chain catcher** to prevent the chain from flying off the bar.

- **Easy-start system** (likely a recoil starter with reduced effort) for smoother starting.

8. **Professional-Grade Features**

- **Adjustable depth gauge** on the chain for precise cutting.

- **High-quality air filter** (likely a foam or synthetic type) to protect the engine from debris.

- **Durable spark arrestor** for compliance with safety regulations in many regions.

---

### **Cons**

1. **Cost**

The Stihl 4140-121-1605 FC55 is a **professional-grade saw**, and its price reflects that. It is significantly more expensive than entry-level or mid-range chainsaws (e.g., Stihl MS 200i or Husqvarna 450i). The cost may be a barrier for casual users or those on a tight budget.

2. **Fuel Injection Complexity**

While fuel injection improves performance, it can be more complex to diagnose and repair compared to carbureted models. If the fuel injection system fails, repairs may require professional assistance, increasing long-term costs.

3. **Fuel and Oil Requirements**

Fuel-injected saws typically require **pre-mixed fuel (gasoline 2-stroke oil)** in a specific ratio (usually 50:1). This adds to the cost of operation compared to 4-stroke saws, which only require gasoline. Additionally, the saw may require **high-quality oil** to ensure optimal performance.

4. **Weight and Fatigue**

While the 4140 is lighter than some professional saws (e.g., Stihl MSA 291), it is still heavier than smaller saws. Prolonged use can lead to operator fatigue, especially if the saw is not properly balanced or if the user is not accustomed to professional-grade tools.

5. **Maintenance Frequency**

- Regular cleaning of the air filter.

- Checking and adjusting the chain tension.

- Inspecting the spark plug and fuel system.

- Ensuring the oil pump is functioning correctly.

- Replacing the chain and bar periodically (every 10-20 hours of use, depending on conditions).

Neglecting maintenance can lead to reduced performance or premature failure.

6. **Noise and Vibration**

Like most professional chainsaws, the 4140 is **loud (typically 100-110 dB)** and produces significant vibration. While the AVT system helps, prolonged exposure can still cause discomfort or fatigue. Users should wear **ear protection and gloves** during operation.

7. **Bar and Chain Wear**

Professional saws are designed for heavy use, which means the **bar and chain wear out faster** than on lighter-duty saws. Replacing these components adds to the long-term cost of ownership.

8. **Learning Curve**

For users unfamiliar with professional chainsaws, the 4140 may require a **learning period** to master. Features like the fuel injection system, chain tensioning, and ergonomic adjustments (e.g., front handle positioning) may take time to get used to.

9. **Limited Portability**

The saw s size and weight make it less portable than smaller models. It is best suited for **stationary or semi-stationary use** (e.g., cutting firewood at home or on a worksite) rather than frequent transport.

10. **Environmental and Legal Considerations**

- Fuel-injected saws produce fewer emissions, but they still require **proper disposal of used fuel and oil**.

- In some regions, chainsaws may be subject to **noise restrictions** or require specific safety certifications.

---

### **Conclusion**

The **Stihl 4140-121-1605 FC55** is an excellent choice for **professional users, serious hobbyists, or those who require a high-performance chainsaw for heavy-duty tasks**. Its fuel injection system, durability, ergonomic design, and power make it a top-tier option in its class. However, its **high cost, maintenance requirements, and complexity** may not justify its purchase for casual users or those who only need a saw for light-duty tasks.

If you prioritize **performance, reliability, and longevity** and are willing to invest in a professional-grade tool, the 4140 is an outstanding investment. For **budget-conscious users or those who only need a saw occasionally**, a mid-range or entry-level model (e.g., Stihl MS 200i, Husqvarna 450i, or Echo CS-450) may be a more practical choice.

---

### **Recommendation**

- You are a **professional logger, landscaper, or contractor** who uses a chainsaw daily for heavy-duty work.

- You value **durability, power, and fuel efficiency** and are willing to invest in a high-quality tool.

- You have experience with **professional power tools** and are prepared for the maintenance requirements.

- You need a saw that can handle **thick hardwoods, firewood, or prolonged use** without frequent breakdowns.

- You prefer **ergonomic features** like adjustable handles and anti-vibration technology.

- You are a **casual user** who only needs a saw for occasional home projects (e.g., cutting firewood a few times a year).

- You are on a **tight budget** and cannot afford the upfront cost or long-term maintenance expenses.

- You are unfamiliar with **professional power tools** and may struggle with the complexity of fuel injection or maintenance.

- You prioritize **portability** over power, as the saw is heavier than smaller models.

- You prefer **4-stroke saws** (e.g., Stihl MSA 291) for easier maintenance and lower fuel costs.

Details:

Good working condition.

part #: 41401211605 prices

• $8.00-$13.99

specifications hedgtriequ:

• brand: Stihl
• mpn: 4140-121-1605
• type: Hedge Trimmer
• power source: Gasoline
• country of origin: Germany

general hedgtriequ:

• condition: Used
• Yard, Garden Outdoor Living > Outdoor Power Equipment > Hedge Trimmers

returns hedgtriequ:

• paid by: Buyer
• policy: Returns Accepted
• method: Money back
• time: 30 Days

shipping hedgtriequ:

• transit: 5-12 Days
• service: USPS Ground Advantage
• cost: $0.00
• carrier: USPS
• class: Standard
• type: Calculated

payments hedgtriequ:

• wallet: Apple-pay
• other
• credit card: Discover

offer hedgtriequ:

• sold: 0
• started: June 11, 2026
• options: Ship-to-home
• quantity: 1
• availability: In Stock

seller hedgtriequ:

• city: Gilbert, South Carolina
• # reviews: 3134
• rating: 99.1%

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