The STIHL MS 251 is a powerful chainsaw, powered by a 45.6cc 2-stroke engine with a power output of 2.2kW / 3hp, that also benefits from STIHL 2-MIX technology.
There are two size bars to choose from; 16″/40cm and 18″/45cm, and is fitted with a durable .325, 1.5 STIHL chainsaw chain.
The MS251 has been packed full of innovative technology, suitable for a variety of applications, from cutting firewood to timber construction. The high torque engine on this chainsaw is easy to start and comfortable to use, with a high cutting performance.
Displacement cm³ 45.6
Power output kW/bhp 2.2/3
Bar length cm 40-45
Bar length ” 16-18
Weight kg 1) 4.8
Weight kg 2) 5.67 / 5.88
Power-to-weight ratio kg/kW 2.2
Sound pressure level dB(A) 3) 103
Sound power level dB(A) 3) 114
Vibration values left/right m/s² 4) 3.9/3.9
STIHL Oilomatic saw chain pitch/type .325″ RM
STIHL Oilomatic saw chain pitch/type .325″
Oil pump Not adjustable
Tank volume l 0.39
Chain pitch .325″
Chain tensioning Side chain tension
Sprocket – number of teeth 7.7 Z
Filter Long-term filter system / round cartridge filter
Filter material Flocked,Non-woven tissue
Bumper spike Steel claw
Cylinder Chrome
Oil tank volume cm3 200
Sprocket Profile chain row,Sprocket profile
Anti vibration system AV + steel spring
Filler cap Tools,WTV tool-free tank cap
EPA Certified fuel consumption l/h 1.075
CO²  g/kWh 862
Handle type Standard grip,Standard handle
Exhaust Standard muffler,Standard silencer
Carburettor Compensator / Limiter Caps / scavenging / Carburettor,Limiter caps / compensator / carburetor preheating / flushing reservoir
Speed at maximum power rpm 10.000
EPA Certified fuel consumption glh 0.284