STIHL MS 251 18″ Chainsaw

Why buy the STIHL MS 251 18″ Petrol Chainsaw? Powerful 45.6 cm³ (2.2 kW) STIHL 2-MIX engine for high performance Fitted with an 18-inch (45 cm) guide bar and .325″ RM3 Pro saw chain Side-mounted chain tensioning for safe and easy adjustments Advanced long-life air filter system with pre-separation for extended service intervals STIHL anti-vibration system reduces fatigue for more comfortable operation Tool-free fuel and oil caps for quick and simple refilling The STIHL MS 251 is an exceptional petrol chainsaw designed for homeowners, landowners, and farmers who require high performance for property maintenance. It’s the optimum choice for a variety of applications, from efficiently cutting firewood to tackling timber construction projects. Its high-torque engine delivers impressive cutting performance while being comfortable and easy to operate. Efficient and Eco-Friendly 2-MIX Engine At the heart of the MS 251 is STIHL’s advanced 2-MIX engine technology. This innovative system significantly reduces environmental impact and running costs, cutting emissions by up to 70% and lowering fuel consumption by up to 20% compared to conventional STIHL 2-stroke engines of the same power output. This means you get a powerful, responsive chainsaw that’s kinder to your wallet and the environment. User-Focused Design and Features STIHL has engineered the MS 251 with the user firmly in mind, incorporating several features to make operation safer, easier, and more comfortable. Side-Mounted Chain Tensioning: This feature allows for protected, quick, and straightforward chain tensioning and replacement. The tensioning screw is conveniently accessed laterally through the sprocket cover, eliminating the need to touch the sharp chain. Long-Life Air Filter System: The advanced air filter system features pre-separation routing, which removes larger particles from the airstream before they reach the HD2 filter. This process significantly extends the filter’s service life, reduces maintenance frequency, and ensures the engine is protected from even fine dust for long-term reliability. Carburettor Compensator: This intelligent control system maintains a consistent engine performance, exhaust quality, and fuel consumption, even as the air filter becomes contaminated. This reduces the need for frequent maintenance, allowing you to work for longer without a drop in performance. Tool-Free Fuel Caps: Refuelling is made simple with tool-free caps for both the fuel and oil tanks. The bayonet closure allows you to open and secure the tanks in just a few simple steps. STIHL Ematic System: This system ensures highly efficient lubrication by delivering chain oil precisely where it’s needed, reducing oil consumption by up to 50%. The system comprises a specialised guide bar, saw chain, and a controlled-delivery oil pump. STIHL Anti-Vibration System: To combat user fatigue, buffer and spring elements significantly reduce the transmission of engine vibrations to the handle area. This makes the MS 251 more comfortable to hold and operate, especially during prolonged use. As an authorised STIHL dealer in the UK, Sims Garden Machinery has been advising customers for over 100 years. When you purchase from us, you’re not just buying a box. For local customers, every STIHL chainsaw receives a free Pre-Delivery Inspection (PDI) by our trained mechanics, and we offer complimentary local delivery and a full handover demonstration to ensure you can operate your new machine safely and effectively. Our trained sales staff are always available to offer expert advice, whether in our Stratford-upon-Avon showroom or over the phone. Not sure which machine or part is right for you? Our team is here to help. Contact us today for expert advice. Technical Specification Specification Value Displacement 45.6 cm³ Power Output 2.20 kW / 3 HP CO2 819 g/kWh Device Weight (without fuel, bar, chain) 4.8 kg ¹ System Weight (with bar and chain) 5.61 / 5.71 kg ² Power-to-weight Ratio 2.20 kg/kW Bar Length 45 cm / 18 in ³ Saw Chain Pitch .325″ Sound Pressure Level 103 dB(A) ⁴ Sound Power Level 113 dB(A) ⁴ Vibration Level (left/right) 3.9 / 3.9 m/s² ⁵ ¹) without guide bar and saw chain ²) with guide bar and saw chain ³) The actual cutting length is shorter than the specified bar length ⁴) K-value according to Directive 2006/42/EC = 2.0 dB(A) ⁵) K-value according to RL 2006/42/EG = 2 m/s² Why buy from Sims Garden Machinery? Authorised main dealer We are authorised dealers for leading brands, meaning genuine parts, manufacturer-approved training, and warranty support you can rely on. Real people, real support No call centres. No ticket systems. Just a knowledgeable local team you can speak to when you need help. Expert advice — not pushy sales Our team are trained mechanics and product specialists, so you get honest, practical advice based on how you’ll actually use the machine. Established, independent family business We’re a long-standing independent dealer with deep roots in the local area — built on reputation, repeat customers, and word of mouth. Frequently Asked Questions Who is the STIHL MS 251 chainsaw best suited for? The STIHL MS 251 is designed as a high-performance domestic chainsaw. It is ideal for homeowners with large properties, landowners, farmers, and anyone who needs to regularly cut significant amounts of firewood or carry out property maintenance and timber construction tasks. It offers a great balance of power, comfort, and durability for demanding non-professional use. What are the main benefits of the STIHL 2-MIX engine? The STIHL 2-MIX engine provides two key advantages. Firstly, it significantly reduces harmful emissions by up to 70%, making it more environmentally friendly. Secondly, it improves fuel efficiency by up to 20% compared to a conventional STIHL 2-stroke engine of similar power, saving you money on fuel over the lifetime of the machine. How does the side-mounted chain tensioning make maintenance easier? Side-mounted chain tensioning provides safer and more convenient access to the tensioning screw. Instead of reaching around the front of the guide bar near the chain, the screw is located on the side of the machine, inserted through the sprocket cover. This makes it much easier and quicker to re-tension the chain or replace it when needed. What is included with the STIHL MS 251 from an authorised dealer? When you purchase a STIHL MS 251 from an authorised dealer like Sims Garden Machinery, you receive the chainsaw powerhead, the specified 18-inch guide bar, and the correct .325″ RM3 Pro saw chain. For local customers, the machine is fully assembled, fuelled, and tested (a process called PDI) by our trained mechanics. We also offer a handover demonstration to ensure you are comfortable with its operation and safety features. User Manuals / Downloads View STIHL Brochure