Chainsaw STIHL MS 251

The MS 251 chainsaw is a strong, compact chainsaw with up to 20% lower fuel consumption and up to 70% fewer emissions compared with STIHL two-stroke engines of the same power class without 2-MIX technology. Easy to control, comfortable to handle. An ideal saw for property maintenance.

Tool-free fuel caps, pre-separation air filtration system, 2-MIX engine, single-nut chain sprocket cover, three-clip engine cover for easier maintenance.

The MS 251 chainsaw, with an excellent power-to-weight ratio, is ideal for construction work, cutting firewood, limbing and felling trees up to 35 cm.

STIHL 2-MIX®

2-MIX: Using the unique four-channel technology developed by STIHL, a cushion of fresh air is created between the combustion gases and the fresh fuel. This cushion reduces the amount of fresh fuel that ends up among the combustion gases, thereby cutting fuel consumption. This also produces fewer exhaust emissions, making the engine's operation kinder to the environment.

About guide bars

STIHL produces a full range of guide bars for all STIHL chainsaws. With a few exceptions,
all STIHL guide bars use the oil-saving Ematic system. Every guide bar marked with the letter E
is an Ematic guide bar. STIHL guide bars are available in a wide range of lengths and in gauges of 1.1 mm (Rollomatic
Mini), 1.3 mm, 1.5 mm and 1.6 mm.
The contour of the various guide bars is optimised to meet the following requirements:
– cutting performance,
– straight-line cutting,
– kickback behaviour,
– durability.
A long bar groove is milled into the edge of the guide bar. The base of the drive link reaches the bottom of the bar groove, ensuring the chain runs in a straight
line and the bottoms of the chain links move along the edge of the bar groove. The bar groove also acts as a supply channel for the chain oil.
During cutting, the guide bar is subjected to the same stress as the saw chain. The guide bar is therefore made
from durable material that has additionally been hardened and toughened through a special curing process.