STIHL 4180-020-1208 Cylinder Lower Casing FS91/ KM91/ FC91 38MM

( Brand: Stihl ), ( Manufacturer Part Number: 4180-020-1208 ), ( Compatible Brand: For Stihl ), ( Power Source: Gasoline ), ( Color: Silver ), ( Compatible Model: Fs 91, Fs 111, Fc 91, Fc 96, Km 91 ), ( Year Manufactured: 2017 ), ( Material: Aluminum, Steel ), ( Compatible Product: Brush Cutter, String Trimmer, Weed Trimmer ), ( Engine Type: 4-stroke ), ( Type: Engine ), ( Assembly Required: Yes ), ( Engine Size: 28.4 Cc ), ( Country Of Origin: United States )

Review STIHL Genuine Fs91/ Km91/ Cylinder Lower Casing Oem 38mm Bore

The **STIHL 4180-020-1208 FS91/KM91/FC91 Cylinder Lower Casing (38mm)** is a precision-engineered component designed exclusively for STIHL s high-performance gas-powered chainsaws, including the robust FS91, KM91, and FC91 models. Crafted from durable, high-grade cast iron, this lower cylinder casing serves as a foundational element of the engine s combustion system, housing the piston, cylinder liner, and critical sealing components while ensuring optimal compression and thermal efficiency. The **38mm cylinder bore** a hallmark of STIHL s engineering balances power output with fuel efficiency, delivering a smooth, reliable operation even under demanding conditions such as heavy-duty cutting, prolonged use, or extreme temperatures. The casing s robust construction resists warping and wear, maintaining critical tolerances that are essential for consistent engine performance and longevity. Its precise machining and tight-fitting design minimize oil consumption and friction, reducing maintenance requirements while maximizing the chainsaw s operational lifespan. Whether used in professional landscaping, construction, or industrial applications, this component is integral to sustaining the chainsaw s reputation for durability and dependability. For optimal results, it is recommended to pair this casing with genuine STIHL replacement parts and follow the manufacturer s service intervals to preserve the engine s efficiency and prevent premature failure.

### **Pros and Cons of buying a STIHL 4180-020-1208 FS91/KM91/FC91 Cylinder Lower Casing (38mm)**

1. **Compatibility with STIHL Engines** This part is designed specifically for STIHL s FS91, KM91, and FC91 engine models, ensuring a proper fit and optimal performance. It reduces the risk of misalignment or improper sealing, which can lead to engine damage or inefficiency.

2. **Durability and Quality** STIHL is known for manufacturing high-quality, long-lasting components. The lower casing is made from robust materials to withstand the stresses of repeated use, vibration, and exposure to outdoor elements.

3. **Performance Optimization** A well-fitted cylinder lower casing helps maintain proper compression and fuel-air mixture balance, which can improve engine efficiency, power output, and fuel economy. This is particularly important for chainsaws, which rely on consistent performance under demanding conditions.

4. **Easier Maintenance and Replacement** Since this is a direct replacement part, it simplifies repairs and maintenance. Mechanics and DIY users can quickly swap it out without needing extensive modifications or additional tools.

5. **Warranty Coverage** If purchased directly from an authorized STIHL dealer or through a reputable supplier, this part may come with a warranty, providing peace of mind against defects in materials or workmanship.

6. **Standardized Dimensions (38mm)** The 38mm diameter ensures compatibility with standard cylinder kits and pistons, making it easier to source additional replacement parts if needed in the future.

7. **Reduced Risk of Leaks** A properly fitted lower casing helps prevent oil or fuel leaks, which can contaminate the engine or surrounding areas, prolonging the life of the tool and reducing the need for frequent cleanups.

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1. **Cost** As a genuine STIHL part, this lower casing will likely be more expensive than aftermarket alternatives. For budget-conscious buyers, this could be a significant drawback, especially if the engine is older or less valuable.

2. **Limited Availability** Depending on the region, finding this specific part may require ordering from an online retailer or contacting a STIHL distributor. This could result in longer wait times compared to more commonly available aftermarket parts.

3. **Potential Overkill for Older or Low-Use Tools** If the chainsaw is very old or used infrequently, the cost of replacing just the lower casing may not be justified. In such cases, a full engine rebuild or replacement might be more economical.

4. **Installation Complexity** While the part itself is straightforward, removing the old casing may require disassembling the engine, which can be tricky for inexperienced users. Improper handling during installation could lead to damage to other components.

5. **Aftermarket Alternatives Exist** Some third-party manufacturers produce compatible cylinder casings that are often cheaper. While these may not always match STIHL s quality, they can be a viable option for users who prioritize cost savings over brand reliability.

6. **Depreciation** If the chainsaw is no longer in active use or is being replaced soon, the expense of this part may not provide long-term value. The cost could be better spent on a new tool instead.

7. **Environmental and Ethical Considerations** Purchasing a new part contributes to e-waste and resource consumption. If the engine is salvageable, some users may prefer to explore refurbishment or recycling options before opting for a replacement.

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The STIHL 4180-020-1208 cylinder lower casing (38mm) is a high-quality, reliable replacement part that offers significant benefits for users who prioritize performance, durability, and compatibility with their STIHL chainsaw. Its advantages in terms of fit, longevity, and ease of maintenance make it a strong choice for those who want to maintain or restore their tool to optimal working condition.

However, the higher cost and potential overkill for low-value or obsolete tools may deter some buyers. Additionally, the availability and installation requirements should be carefully considered before purchasing. For users who are committed to keeping their STIHL engine in peak condition and can justify the investment, this part is a sound choice. Those on a tight budget or with older tools might weigh the pros and cons against aftermarket alternatives or other repair options.

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- You own a STIHL chainsaw with an FS91, KM91, or FC91 engine and need a reliable, long-lasting replacement.

- You value genuine STIHL components for optimal performance and compatibility.

- You are willing to invest in maintaining your tool s longevity and efficiency.

- You have access to proper tools and mechanical knowledge for installation (or are comfortable seeking professional help).

- Your chainsaw is old, rarely used, or nearing the end of its lifespan, making the cost of this part disproportionate.

- You are open to aftermarket parts that offer similar functionality at a lower price.

- You are unsure about the engine s overall condition and could benefit from a full inspection or rebuild before committing to a single part replacement.

- You prioritize environmental sustainability and would prefer to explore refurbishment or recycling options.

For most users who rely on their STIHL chainsaw for regular, heavy-duty use, the 4180-020-1208 lower casing is a worthwhile investment in the tool s performance and longevity. However, always assess your specific needs and budget before making a purchase.

Details:

Part of the 4180 series P/N, compatible with most STIHL FC/FS/KM 91 model's. Does not come with piston/rings/rod/bearings/crankshaft/valves/valve cover. This is FOR PARTS OR REPAIR. No broken fins or major defects.

Cylinder will need a full rebuild. Great for a fresh rebuild. Has been cleaned and ultrasonic cleaned, still has some grime original gasket maker on the bottom flange. Nice OEM STIHL cylinder and lower crank case assembly.

Cylinders is free of scoring.

part #: 41800201208 prices

• $29.69-$145.48

specifications strintri:

• brand: Stihl
• mpn: 4180-020-1208
• compatible brand: For Stihl
• power source: Gasoline
• color: Silver
• compatible model: Fs 91, Fs 111, Fc 91, Fc 96, Km 91
• year manufactured: 2017
• material: Aluminum, Steel
• compatible product: Brush Cutter, String Trimmer, Weed Trimmer
• engine type: 4-stroke
• type: Engine
• assembly required: Yes
• engine size: 28.4 Cc
• country of origin: United States

general strintri:

• condition: For parts or not working
• Yard, Garden Outdoor Living > Outdoor Power Equipment > String Trimmer Parts

seller strintri:

• # reviews: 479
• city: Saint Petersburg, Florida
• rating: 100.0%

shipping strintri:

• type: Calculated
• cost: $16.45
• service: USPS Ground Advantage
• class: Standard
• transit: 4-10 Days
• carrier: USPS

offer strintri:

• best offers: True
• started: April 28, 2026
• sold: 0
• options: Ship-to-home
• availability: In Stock
• quantity: 1

payments strintri:

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

returns strintri:

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

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