How Does the Stihl MS 251 Perform in Stump Grinding After Tree Removal?
The Stihl MS 251 is a mid-range chainsaw that many property owners consider for stump grinding tasks after tree removal. With a 45.4 cc engine and a power output of 3.0 kW (4.0 bhp), it delivers sufficient torque for cutting through stubborn root systems. In practical terms, the saw can handle stumps up to 30 cm in diameter when equipped with a 40 cm (16-inch) guide bar. However, for larger stumps or dense hardwood like oak or beech, the MS 251 may require multiple passes and frequent chain sharpening.
One key aspect of choosing the right chainsaw for stump grinding is understanding the blade-to-wood contact area. The MS 251 uses Stihl’s Quickstop chain brake and a side-access chain tensioner, which are practical for repeated adjustments during grinding. The saw’s weight of 4.9 kg (without bar and chain) makes it manageable for overhead cuts on elevated roots, though prolonged use can lead to fatigue.
What Techniques Optimize Stihl MS 251 for Stump Grinding?
Effective stump grinding with the Stihl MS 251 requires a systematic approach. Start by exposing the stump’s root flare using a shovel and axe to remove soil. This reduces the risk of dulling the chain on hidden rocks. Next, make vertical plunge cuts into the stump’s centre, about 10–15 cm deep, working outward in a radial pattern. For roots, use a horizontal cutting angle, keeping the bar parallel to the ground to minimise kickback.
When grinding below ground level, adjust the saw’s idle speed (typically 2,500–3,000 rpm) to avoid chain spin when not cutting. Always maintain a firm grip with both hands on the handles, especially during the initial cut. For stumps with tough heartwood, consider a 3/8″ pitch chain with 0.063″ gauge to improve cutting efficiency. Also, ensure the chain is sharp; a dull chain forces the saw to work harder, increasing fuel consumption and wear.
Safety precautions are critical during grinding. Wear chain-resistant chaps, steel-toed boots, and hearing protection. The MS 251’s anti-vibration system reduces hand-arm vibration syndrome (HAVS) risk, but limit operating time to 30 minutes per hour. For deep roots, use a stump grinder attachment instead of the chainsaw to avoid damage to the bar and chain.
How Does the Stihl MS 251 Compare to Other Saw Options for Stump Removal?
The table below compares the Stihl MS 251 with larger and smaller alternatives commonly used for stump grinding tasks after tree removal.
| Feature | Stihl MS 251 | Stihl MS 261 C-M | Stihl MS 180 |
|---|---|---|---|
| Engine displacement (cc) | 45.4 | 50.2 | 31.8 |
| Power (kW/hp) | 3.0 / 4.0 | 3.5 / 4.7 | 1.5 / 2.0 |
| Bar length available (cm) | 35–45 | 40–50 | 30–40 |
| Weight (kg, without bar/chain) | 4.9 | 5.1 | 4.1 |
| Stump max diameter (cm) | 30 | 40 | 15 |
| Fuel consumption (L/h) | ~0.6 | ~0.7 | ~0.4 |
| Average price in UK (£) | £380–450 | £550–650 | £250–300 |
| Suitability for DIY | High | Moderate | Very High |
As the table shows, the MS 251 strikes a balance between power and weight, making it a practical choice for professional vs DIY tree removal scenarios. For frequent stump grinding, the MS 261 C-M offers higher output, but the MS 251’s lower cost and lighter handling often win over part-time users.
What Safety Measures Are Essential When Using the Stihl MS 251 for Stump Grinding?
Stump grinding with a chainsaw carries specific risks, including kickback, chain breakage, and flying debris. The Stihl MS 251 is equipped with a chain catcher and a hand guard, but the operator must follow rigorous protocols. Always inspect the chain tension before starting; a loose chain can derail or snap. Use a decompression valve to simplify starting, reducing strain on the arm.
For stump grinding, never cut at shoulder height or above, as this increases kickback force. The saw’s 16-inch bar is optimal for ground-level cutting, but avoid contact with the ground, which will dull the chain instantly. Keep the chain lubricated with Stihl chain oil (ISO VG 100 grade) to reduce friction and heat buildup. Clear the work area of tripping hazards, such as exposed roots or loose soil.
When working in wet soil, be cautious of electric shock risk if there are buried cables. The MS 251’s ignition system is shielded, but moisture can still affect spark plug performance. For emergency wind damage scenarios, see Stihl MS 251 emergency tree services after heavy wind for additional precautions. Always have a fire extinguisher nearby, as fuel spills on hot exhaust parts can ignite.
What Do Owners Say About the Stihl MS 251 for Stump Work?
Feedback from UK users on forums and review sites highlights several strengths and weaknesses. On the positive side, many praise the MS 251’s reliability and easy starting compared to older models. “I’ve used it on about 30 stumps in my garden after winter tree removal in icy conditions, and it never stalled,” writes one reviewer on a gardening forum. Another owner notes that the anti-vibration system is effective for 30-minute sessions, though longer periods can still cause hand numbness.
Negative feedback often centres on the saw’s limited power for tough stumps. “My ash stump (40 cm diameter) took two full tanks of fuel and a sharpened chain halfway through,” comments a user. Some owners recommend upgrading to a 0.043″ gauge bar for better chip clearance in wet wood. Overall, the MS 251 scores about 4.2 out of 5 on average across major UK retailers, with 70% of users rating it as “excellent” for light-to-medium stump grinding tasks.
Frequently Asked Questions
Can the Stihl MS 251 grind stumps below ground level?
Yes, but it requires careful technique. Make shallow cuts (5 cm deep) and avoid burying the bar deeper than the chain’s length. For stumps below grade, a dedicated stump grinder may be safer and more efficient.
What is the fuel mix for the Stihl MS 251?
Use a 50:1 ratio of unleaded petrol to Stihl HP Ultra two-stroke oil. Incorrect mixing can cause engine damage or reduced performance during stump grinding.
How often should I sharpen the chain when grinding stumps?
After every 5–10 minutes of cutting in soil-contacted wood. Use a 5/32″ round file and maintain a 30° angle. A dull chain will increase fuel consumption and risk kickback.
Is the Stihl MS 251 suitable for DIY stump removal?
Yes, for stumps under 30 cm diameter. For larger stumps, consider hiring a professional or using a cost comparison with Husqvarna 450 to evaluate alternatives.
What bar length is best for stump grinding?
The 40 cm (16-inch) bar offers a good balance between reach and control. Longer bars (45 cm) can increase leverage but reduce cutting precision near roots.
Does the Stihl MS 251 have a chain brake for safety?
Yes, it features Stihl’s Quickstop chain brake that activates automatically during kickback. Always test the brake before use by manually engaging it with the hand guard.
