MS 251 C-BE RM New powerful STIHL chainsaw with accelerator & amp; Ergostart 1) Without fuel, blade and chain 2) Coefficient K according to Directive 2006/42 / EC = 2.5 dB (A) 3) Coefficient K according to Directive 2006/42 / EC = 2m / s ² Cubic capacity cm³ 45,6 Power kW / HP 2,2 / 3 Weight kg 1) 5,1 Sound pressure level dB (A) 2) 103 Sound power level dB (A) 2) 114 Vibration left / right m / s² 3) 3,9 / 3,9 Power to weight ratio kg / kW 2.4 Step / chain type .325 ", 0.325 Standard Long-lasting air filtration system The long-lasting air filtration system with separation cyclone ensures significantly longer filter life. The separation cyclone removes the large dirt particles so they do not burden the filter, thus doubling the time until the next cleaning. anti-vibration system long term, intense vibration on the machines handles can cause problems in the blood supply to the fingers and hands. to prevent this problem, the STIHL has developed a high quality anti-vibration system with the anti-vibration system the transmission to the handles of the oscillations produced by the motor and the component is significantly reduced. Pressure compensator The STIHL pressure compensator, a regulator built into the carburetor, ensures that engine performance, exhaust quality and fuel consumption remain almost constant over an extended period of time, despite progressive air pollution. Chain Tensioner The STIHL Chain Tensioner plays the chain tensioner. After loosening the bell cap, you can stretch the chain simply and quickly by turning the adjusting wheel. ErgoStart System Easier to start than ever. In the new ErgoStart system, there is an additional coil spring between the starter pulley and the crankshaft, which compresses against the compression pressure exerted on the piston. When the spring force exceeds the compression pressure, the crankshaft will start to rotate, starting the engine. The machine starts smoothly and comfortably, without annoying fluctuations in the required power. Ematic Chain Lubrication System The STIHL Ematic-System consists of an Ematic blade, an Oilomatic chain and an adjustable or reduced flow oil pump. The special construction of the blade and the chain ensures that every drop of oil reaches where it really needs lubrication. Thus oil consumption can be reduced by up to 50%. Multi-function lever The basic functions of the machine, such as cold and hot start, operation and stop, are controlled by a single lever. This makes handling extremely easy and safe, as the operator does not have to move his right hand away from the handle. Tank cap that opens without tools Special secured plugs for the fuel tank and the oil tank. In machines with such plugs, the tank and the oil tank open and close quickly, with minimal force and without tools. Lateral chain tensioner With the side tensioner, the chain is stretched from the side, through the bell cap. This avoids the contact of the hands with the sharp chain and the support nails of the chainsaw. Carburetor preheating system STIHL chainsaws with carburetor preheating can be relied on even during the colder months of the year: With winter setting, preheated suction air passes around the carburetor. This prevents the carburetor from freezing. A simple move is enough to switch between summer and winter mode. Optional HD2 - New filter New HD2 filter: The new HD2 high density polyethylene filter has 70% thinner pores than nonwoven and polyamide filters, capturing even the finest dust. In addition, it repels water and oil and for this reason it is very easy to clean. The replacement filter is removed and installed without tools.