STIHL 128580 Rx Fuel Tank FS100 4180 351 0506A /0518A

( Brand: Stihl ), ( Manufacturer Part Number: 128580 ), ( Model: 0518A 128580 ), ( Type: Fuel Tank )

Review STIHL Used Rx Fuel Tank 351 /0518a

The **STIHL FS 100 RX** (model number **128580**) is a high-performance, professional-grade fuel-powered reciprocating saw designed for demanding applications in landscaping, construction, and heavy-duty cutting tasks. Engineered with STIHL s signature precision and reliability, this saw delivers unmatched power and efficiency, making it a top choice for professionals who demand both durability and performance. The **FS 100 RX** is equipped with a **4180 cc (4.2 L) fuel tank**, ensuring extended runtime without frequent refueling, which is ideal for long workdays or large-scale projects where downtime is costly. This generous tank capacity, combined with STIHL s optimized fuel mixture system, minimizes fuel consumption while maintaining consistent power output, reducing operational costs and environmental impact.

At the heart of the FS 100 RX is STIHL s **254 cc two-stroke engine**, which produces a robust **100 cc displacement** a hallmark of STIHL s commitment to power and efficiency. The engine is paired with a **high-performance air-cooled system** that prevents overheating even under sustained heavy loads, ensuring consistent performance in the most demanding conditions. The saw s **automatic centrifugal clutch** provides smooth, controlled acceleration, reducing operator fatigue and improving precision during cutting. This feature, along with the **easy-start system**, allows for quick and effortless ignition, even in cold or humid environments, making the FS 100 RX a versatile tool for year-round use.

The **FS 100 RX** is built with **high-strength steel components**, including a **durable, vibration-dampening frame** that minimizes operator fatigue during prolonged use. The saw s **ergonomic design** features a **comfortable, contoured handle** with a **soft-grip material**, reducing strain on the hands and wrists while providing a secure, non-slip grip. The **adjustable chain brake** offers precise control, allowing operators to engage or disengage the brake quickly for safety and efficiency, particularly when switching between cutting and transport modes. Additionally, the **quick-release chain tensioning system** simplifies chain adjustments, saving time and reducing the risk of misalignment a common issue with less user-friendly saws.

For maximum cutting efficiency, the FS 100 RX is compatible with **STIHL s full line of high-performance chains**, including the **Quick Chain** system, which allows for rapid chain changes without tools. The saw s **chain guide bar** is precision-machined for optimal chain tracking and longevity, while the **integrated chain oil reservoir** ensures automatic lubrication, extending chain life and reducing maintenance requirements. The **adjustable oil flow control** allows operators to fine-tune lubrication based on cutting conditions, further enhancing performance and reducing wear on both the chain and guide bar.

Safety is a priority in STIHL s design philosophy, and the FS 100 RX incorporates several advanced features to protect the operator. The **chain brake lever** is easily accessible and can be engaged in an instant to stop the chain mid-cut, preventing accidental injuries. The **vibration-dampening system** reduces operator fatigue by minimizing transmitted vibrations, while the **ergonomic design** promotes a natural cutting posture. Additionally, the saw s **durable, high-visibility components** improve visibility in low-light conditions, enhancing safety during early morning or late afternoon work. The **comprehensive tool-free maintenance system** ensures that routine checks, such as chain tensioning and oil level adjustments, can be performed quickly, keeping the saw in optimal working condition with minimal downtime.

The **FS 100 RX** is not just a powerful cutting tool it s a **professional-grade machine** built to withstand the rigors of heavy-duty use. Whether tackling **tree felling, branch trimming, brush clearing, or construction-related cutting tasks**, this saw delivers the **speed, precision, and reliability** that professionals demand. The **4180 cc fuel tank** ensures that operators can work for extended periods without interruption, while the **efficient engine and fuel system** optimize performance while minimizing fuel waste. With its **durable construction, ergonomic design, and advanced safety features**, the STIHL FS 100 RX is an investment in productivity, efficiency, and long-term reliability making it an indispensable tool for any professional landscaper, arborist, or contractor.

The **Stihl FS 100 RX** (model numbers **4180 351 0506A / 0518A**) is a mid-sized, professional-grade chainsaw designed for heavy-duty cutting tasks such as felling trees, bucking logs, and clearing brush. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

---

### **Pros of the Stihl FS 100 RX**

1. **Powerful Engine and Performance**

- The **254 cc two-stroke engine** delivers strong power output, making it capable of handling thick hardwoods and prolonged cutting sessions without excessive strain.

- The **automatic oiler** ensures consistent lubrication of the chain, reducing wear and improving cutting efficiency.

- **Low vibration levels** (compared to some competitors) contribute to operator comfort during extended use.

2. **Durability and Build Quality**

- Stihl is renowned for its **robust construction**, and the FS 100 RX is no exception. The **aluminum piston, forged crankshaft, and high-quality steel components** ensure longevity, even under demanding conditions.

- The **oil and fuel tank capacities** (1.2 L for fuel, 0.2 L for oil) allow for extended operation without frequent refills, which is ideal for professional use.

3. **Ergonomics and Operator Comfort**

- The **lightweight design** (approximately **11.5 kg / 25.4 lbs**) reduces fatigue during prolonged use, though it remains a heavy-duty saw.

- The **comfortable handle grip** and **adjustable front handguard** accommodate various operator sizes, improving control and reducing hand fatigue.

- The **low-rebound bar and chain** (e.g., **Stihl QuickTip or similar high-quality sets**) enhance cutting precision and reduce kickback risk.

4. **Safety Features**

- Equipped with **Stihl s Infinia anti-vibration system**, which reduces operator fatigue and improves safety by minimizing hand-arm vibration syndrome risks.

- The **chain brake** (manual or automatic, depending on model variant) stops the chain instantly in case of kickback or unintended contact.

- **Easy-to-service components** (e.g., quick-access spark plug, simple chain tensioning) allow for quick maintenance, reducing downtime.

5. **Versatility**

- Suitable for **both professional and serious hobbyist use**, including felling, limbing, and bucking.

- Compatible with a **wide range of Stihl chains and bars**, allowing users to customize it for specific tasks (e.g., thicker bars for felling, thinner chains for pruning).

6. **Reliability and Brand Reputation**

- Stihl is a **trusted brand** with a long history of producing high-quality power tools. The FS 100 RX is backed by a strong dealer network and readily available parts.

- **Lower long-term costs** compared to some competitors due to durability and efficiency, reducing the need for frequent replacements.

7. **Fuel Efficiency**

- The **254 cc engine** strikes a balance between power and fuel consumption, making it more efficient than larger, heavier saws while still delivering strong performance.

---

### **Cons of the Stihl FS 100 RX**

1. **High Initial Cost**

- The FS 100 RX is **not a budget-friendly saw**. Prices typically range between **$1,200 and $1,500 USD**, depending on the market, dealer, and included accessories (e.g., bar and chain).

- This makes it less accessible for casual users or those on a tight budget.

2. **Weight and Fatigue**

- While lighter than some professional-grade saws (e.g., Husqvarna 572 XP), it is still **heavy for prolonged use**. Operators may experience fatigue during all-day cutting sessions, especially in awkward positions.

- The **ergonomics, while improved, are not as refined as some newer models** (e.g., Stihl s newer RX models with advanced vibration dampening).

3. **Maintenance Requirements**

- **Fuel mixing** (gasoline 2-stroke oil) in the correct ratio.

- **Air filter cleaning/replacement** to maintain engine performance.

- **Chain sharpening or replacement** after heavy use.

- **Spark plug checks** and occasional engine tune-ups.

- Neglecting maintenance can lead to **reduced performance, increased fuel consumption, or engine damage**.

4. **Noise and Exhaust**

- Two-stroke engines are **loud**, and the FS 100 RX is no exception. It produces **around 105-110 dB**, which can be problematic in noise-sensitive areas or for users with hearing concerns.

- **Exhaust emissions** are higher than modern four-stroke or electric alternatives, though this is less of an issue for professional users in rural or remote areas.

5. **Fuel and Oil Consumption**

- The saw **burns fuel quickly**, especially under heavy loads. Users must carry extra fuel and oil, which can be cumbersome in the field.

- **Mixed fuel degrades over time** (typically loses potency after 30 days), requiring careful storage or frequent refilling.

6. **Limited Electric/Alternative Fuel Options**

- Unlike newer Stihl models (e.g., the **MSC 210 C-BE**, a cordless alternative), the FS 100 RX is **gas-powered only**. This may be a drawback for users who prefer battery-operated or four-stroke options for reduced maintenance.

7. **Chain and Bar Wear**

- High-performance chains and bars **wear out faster** with heavy use, adding to ongoing costs. Stihl s **QuickTips and other premium chains** are durable but expensive to replace frequently.

8. **Learning Curve for Beginners**

- The FS 100 RX is **not beginner-friendly**. Its power and weight require **proper technique** to avoid kickback, fatigue, or accidents. New users may benefit from starting with a lighter saw before progressing to this model.

---

### **Conclusion**

The **Stihl FS 100 RX** is a **high-performance, professional-grade chainsaw** that excels in durability, power, and reliability. It is ideal for **serious woodcutters, loggers, and professionals** who demand a saw that can handle heavy-duty tasks without frequent breakdowns. Its **automatic oiler, low vibration, and robust build** make it a favorite among users who prioritize performance and longevity.

However, the **high upfront cost, weight, and maintenance demands** may be prohibitive for **casual users or hobbyists**. Additionally, the **loudness, fuel consumption, and lack of electric alternatives** could be drawbacks for those seeking more modern or eco-friendly options.

If you are a **professional or serious woodcutter** who values **Stihl s reputation for quality and durability**, the FS 100 RX is an excellent investment. For **budget-conscious or occasional users**, a **lighter, more affordable saw** (e.g., Stihl MS 291 C-BE, Husqvarna 452 XP, or a four-stroke alternative) may be a better fit.

---

### **Recommendation**

- You are a **professional logger, landscaper, or serious woodcutter** who needs a **reliable, high-performance saw** for heavy-duty work.

- You **prioritize durability, power, and Stihl s brand reputation** over cost savings.

- You are **comfortable with maintenance tasks** (fuel mixing, chain sharpening, etc.) and have access to **fuel and oil storage**.

- You plan to **use the saw frequently** and can justify the **higher initial cost** with long-term savings on replacements.

- You are a **casual user or hobbyist** and prefer a **lighter, more affordable saw**.

- You want **lower noise levels, reduced emissions, or electric/battery options** (e.g., Stihl MSC or Husqvarna electric saws).

- You **struggle with the weight or ergonomics** of heavier saws and may benefit from a **four-stroke model** (e.g., Stihl MS 462 C-BE) for reduced vibration and maintenance.

- You are **new to chainsaws** and need something **easier to handle** before investing in a professional-grade model.

For most **professionals**, the FS 100 RX is a **strong choice** that delivers on performance and reliability. For others, weighing the **cost, weight, and maintenance** against your specific needs will determine whether it is the right fit.

Details:

Look at the PHOTOS. Some items have more wear and tear than others. Used Stihl FS100 RX Fuel Tank 4180 351 0506A /0518A 128580. I try to take a close up pic of the worn and torn areas.

Some have engraving, paint and permanent marker on them that is from the previous owner. USED LOOK AT PHOTOS USED Know that parts are. They may have scuffs, scratches, nicks, dents, dirt, rust, fading and in some cases cuts, cracks breaks.

part #: 128580 prices

• $19.99-$71.24

specifications strintri:

• brand: Stihl
• mpn: 128580
• model: 0518a 128580
• type: Fuel Tank

seller strintri:

• rating: 100.0%
• # reviews: 664
• city: Valley, Alabama

offer strintri:

• quantity: 2
• sold: 0
• options: Ship-to-home
• started: April 14, 2026
• availability: In Stock

general strintri:

• Yard, Garden Outdoor Living > Outdoor Power Equipment > String Trimmer Parts
• condition: Used

payments strintri:

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

returns strintri:

• policy: No Returns

shipping strintri:

• service: USPS Ground Advantage
• transit: 4-10 Days
• type: Calculated
• class: Standard
• carrier: USPS
• cost: $8.81

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