Description
Stihl MS391 Chainsaw 20” – Powerful 64cc Petrol Chainsaw for Heavy-Duty Firewood & Land Use
The Stihl MS391 20” petrol chainsaw is a high-powered, heavy-duty chainsaw built for landowners, farmers, and serious users who need maximum cutting performance without stepping into full professional models.
With a 64.1cc 2-MIX engine producing around 4.4–4.5hp, it delivers exceptional torque and cutting power for large logs, firewood, and demanding property work.
At Masseys DIY, every chainsaw is assembled, tested, and supported by our in-house workshop, ensuring it’s ready for real-world use. Explore our full range of petrol chainsaws or browse all Stihl chainsaws.
Why Choose the Stihl MS391?
This is where the Stihl MS 391 stands out:
- Significantly more powerful than MS 291
- Handles large logs and thicker timber with ease
- High torque across a wide RPM range
- Built for frequent, demanding use
This is the step-up chainsaw for serious work
Real-World Performance
From real-world use and feedback:
- Cuts large hardwood logs without bogging down
- Strong enough to run longer bars confidently
- Stable and planted feel during heavy cutting
- Reliable for repeated, high-volume firewood work
This is a “one saw does everything” option for landowners
Stihl MS291 vs MS391
| Feature | Stihl MS 291 | Stihl MS 391 |
|---|---|---|
| Engine size | 55.5cc | 64.1cc |
| Power | High | Very high |
| Use case | Heavy domestic | Heavy-duty / farm |
| Cutting ability | Medium-large logs | Large logs & timber |
Choose Stihl MS391 if:
- You regularly cut large logs
- You need maximum torque
- You want a long-term heavy-use saw
Who This Chainsaw Is For
Ideal for:
- Large-scale firewood cutting
- Felling medium-to-large trees
- Farm and land maintenance
- Regular, demanding use
Not ideal for:
- Occasional garden use
- Lightweight pruning
- Users prioritising low weight
This saw is overkill for casual users — but perfect for serious work
Specifications
Engine Power: 3.3 kW (4.4 bhp)- Displacement: 64.1 cc (3.9 cu. in.)
- Weight: 6.4 kg (14.1 lbs) without fuel, guide bar, and chain on the Stihl MS391
- Fuel Capacity: 600 cc (20.3 oz)
- Chain Oil Capacity: 350 cc (11.8 oz)
- Guide Bar Length: Available in 16 inches (40 cm), 18 inches (45 cm), and 20 inches (50 cm)
Key Features Explained
High-torque 2-MIX engine
- Strong performance across all cutting conditions
- Up to 20% better fuel efficiency vs older engines
Decompression valve (easier starting)
- Reduces effort when pulling starter cord
Especially useful on larger engines
Anti-vibration system
- Reduces fatigue
More control during long cutting sessions
Ematic chain lubrication system
- Reduces oil consumption by up to 50%
Running Costs & Ownership
- Fuel mix: 50:1 petrol and oil
- Efficient engine reduces fuel consumption
- Built for long-term durability
Slightly higher fuel use than smaller saws — but far more productive
Why Buy From Masseys DIY
- Authorised STIHL dealer
- Chainsaws assembled and tested before sale
- Expert advice from trained staff
- Full servicing and spare parts support
You’re buying from a hands-on specialist, not just an online seller
Common Buyer Mistakes
- Buying too small → slows down work significantly
- Underestimating workload → needing to upgrade later
- Choosing lightweight over performance
The Stihl MS391 is built to avoid these limitations
FAQs
Is the Stihl MS391 a professional chainsaw?
It sits just below professional models — ideal for heavy-duty landowner and farm use.
What can it cut?
Large logs, hardwood, and medium-to-large trees.
Is it better than the MS 291?
Yes — more power and better suited for demanding work.
Is 20” the right size?
Yes — ideal for larger logs and versatile cutting.
For more information about the Stihl MS391 chainsaw please visit https://www.stihl.co.uk/en
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