Introduction to the Stihl MS 251 for Stump Grinding
The Stihl MS 251 is a mid-range petrol chainsaw designed to handle a variety of tasks around the garden and property, including the demanding work of stump grinding. While not a dedicated stump grinder, this chainsaw offers the power and precision needed to cut through small to medium stumps with the right technique and accessories. Professionals and homeowners alike rely on the MS 251 for its balance of performance and affordability when removing Stihl MS 251 Stump Grinding Tips for Small Stumps.
Stump grinding with a chainsaw involves cutting the stump as low as possible to the ground, then splitting it into manageable pieces. The MS 251’s 45.4 cc engine and 3.5 kW (4.7 hp) output provide sufficient torque to slice through hardwood stumps, though it requires careful handling and sharp chains. This article explores the details of using the Stihl MS 251 for stump grinding, covering cost, maintenance, safety, and real-world owner experiences.
What Are the Key Specifications of the Stihl MS 251?
Understanding the specifications helps determine if this chainsaw meets stump grinding requirements. The MS 251 features a low-emission engine with Stihl’s Easy2Start system, reducing pull-start effort. It typically comes with a 16-inch or 18-inch guide bar, though operators can swap to a 14-inch bar for better stump work control. The chain pitch is 3/8 inch, and the saw weighs approximately 5.6 kg (12.3 lb) without fuel.
For stump grinding, the saw’s maximum cutting speed of 13,500 rpm under load allows it to make rapid cuts through roots. However, the fuel tank capacity of 400 ml (13.5 fl oz) limits runtime to about 45 minutes of continuous cutting, which is adequate for one or two small stumps per tank. The MS 251 also includes an anti-vibration system to reduce fatigue during extended grinding sessions.
| Parameter | Stihl MS 251 | Husqvarna 450 |
|---|---|---|
| Engine displacement (cc) | 45.4 | 50.2 |
| Power output (kW/hp) | 3.5 / 4.7 | 3.7 / 5.0 |
| Guide bar length (inches) | 16–18 | 16–20 |
| Weight without fuel (kg) | 5.6 | 5.9 |
| Fuel tank capacity (ml) | 400 | 500 |
| Chain pitch (inches) | 3/8 | 3/8 |
| New saw price (GBP) | £380–£420 | £400–£450 |
| Annual maintenance cost (GBP) | £50–£80 | £60–£90 |
| Resale value after 3 years (GBP) | £200–£250 | £180–£220 |
As shown in the table above, the Stihl MS 251 is slightly lighter and cheaper to maintain than the Husqvarna 450, making it a cost-effective choice for occasional stump grinding. For a deeper comparison, see our article Stihl MS 251 vs Husqvarna 450: Cost of Ownership.
Is the Stihl MS 251 Powerful Enough for Stump Grinding?
Stump grinding with a chainsaw requires consistent torque to cut through dense wood and hardened roots. The MS 251’s 45.4 cc engine delivers 3.5 kW of power, which is sufficient for stumps up to 30 cm (12 inches) in diameter. For larger stumps, such as those from oak or maple trees, the saw may struggle with repeated deep cuts and require frequent stops to cool.
Operators often use a technique called “bore cutting” to carve out the stump from the centre, reducing stress on the engine. The saw’s chain speed of 13,500 rpm helps maintain momentum, but using a sharp chain is critical. A dull chain forces the engine to work harder, leading to overheating and reduced lifespan. If you plan to fell the tree first and then grind the stump, refer to Felling a 30-Foot Oak with Stihl MS 251.
How Much Does Stump Grinding Cost with the Stihl MS 251?
The cost of stump grinding using the Stihl MS 251 depends on whether you perform the work yourself or hire a professional. For DIY users, the initial investment in the saw is £380–£420, plus additional costs for chains, sharpeners, fuel, and safety gear. A professional stump grinding service using specialised equipment charges £50–£100 per stump, depending on size and accessibility.
If you already own the MS 251, the variable cost per stump is low—roughly £1–£2 for fuel and chain wear. However, replacing the chain after grinding 10–15 stumps adds £15–£25. For extensive stump removal, renting a dedicated stump grinder for £40–£60 per day may be more cost-effective. Professional services are safer for large stumps near structures, as discussed in Stihl MS 251 Emergency Tree Services: After Heavy Wind Damage.
What Safety Gear Is Required for Stump Grinding with the MS 251?
Stump grinding involves kickback risks, flying debris, and high noise levels, so proper safety gear is non-negotiable. Essential equipment includes a chainsaw helmet with face shield, hearing protection, steel-toe boots, cut-resistant trousers, and gloves. The MS 251’s QuickStop chain brake ensures rapid chain stoppage in case of kickback, but this only works if the operator maintains a firm grip.
For stump work, where the saw operates near the ground, leg chaps are particularly important to prevent chain contact. Eye protection is critical because wood chips and soil particles can be thrown upwards. A first-aid kit nearby is advisable for minor cuts. For a full list of recommended gear, see Stihl MS 251: Must-Have Safety Gear for Beginners.
How to Maintain the Stihl MS 251 After Stump Grinding
Stump grinding exposes the chainsaw to dirt, sap, and moisture, which accelerates wear. After each use, clean the guide bar, chain, and air filter thoroughly. The chain should be sharpened after every 2–3 hours of cutting, as dull chains cause binding and engine strain. Check the oiler vent and adjust the flow to ensure consistent lubrication—this prevents bar damage.
Inspect the spark plug every 25 hours of operation and replace if worn. The fuel filter should be replaced annually, and the chain sprocket should be checked for wear after grinding several stumps. Store the saw with a full fuel tank to prevent moisture ingress, and add fuel stabiliser if storing for more than 30 days. Following these steps extends the life of the MS 251, saving money on repairs.
What Owners Say About the Stihl MS 251 for Stump Grinding
Owner reviews highlight the MS 251’s reliability and ease of use for stump grinding tasks. Many praise the Easy2Start system, which reduces pull-start effort, especially in cold weather. Some users note that the saw handles small stumps (under 25 cm) effortlessly but struggles with larger or deeply rooted stumps, requiring multiple passes and frequent chain sharpening.
Common compliments include the saw’s fuel efficiency—lasting 40–50 minutes per tank—and its low vibration levels, which reduce hand fatigue. Criticisms focus on the plastic chain tensioning system, which can loosen during heavy cuts. Owners recommend upgrading to a carbide-tipped chain for longer life when cutting through dirt-embedded roots. Overall, the MS 251 is rated 4.3 out of 5 stars for stump grinding, with many saying it is “ideal for weekend warriors but not for full-time contractors.”
Frequently Asked Questions
- Can the Stihl MS 251 grind a stump flat to the ground? Yes, with proper technique and a sharp chain, the MS 251 can cut a stump to within 2–5 cm of the soil, making it suitable for grass growth. For a completely flat surface, use a grinder attachment or professional equipment.
- What chain should I use for stump grinding with the MS 251? Use a sharp chain with 3/8-inch pitch and .050-inch gauge. Carbide-tipped chains are recommended for durability when cutting through soil and roots, though they are more expensive (£25–£35 each).
- Is the Stihl MS 251 safe for beginners to use for stump grinding? Beginners should only attempt small stumps (under 20 cm) after reading the manual and watching tutorials. Always wear safety gear and maintain a firm grip to prevent kickback. Professional training is advised for first-time use.
- How long does it take to grind a stump with the Stihl MS 251? A 20-cm stump typically takes 10–15 minutes, depending on wood density and root structure. A 30-cm hardwood stump may take 20–30 minutes with breaks for cooling and chain sharpening.
- Can the Stihl MS 251 handle frozen stumps in winter? Yes, but frozen stumps are harder and require a sharp, low-kickback chain. Use a longer warm-up period for the engine and avoid overrevving. Store the saw in a warm area before use.
- What is the warranty on the Stihl MS 251? Stihl offers a 2-year limited warranty for domestic use, covering defects in materials and workmanship. Professional use reduces the warranty to 1 year. Registering the saw online extends coverage by an additional year.
