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The STIHL MS 391 is a gas-powered chainsaw built for felling, firewood cutting and storm cleanup on farms, fields and ranches. It uses STIHL's fuel-efficient engine technology and an IntelliCarb compensating carburetor that keeps engine speed steady as the air filter loads up. It weighs the same as the MS 311 but makes more power, giving it a strong power-to-weight ratio for its class. It suits buyers who cut regularly and want a rugged mid-size saw rather than a light homeowner model.
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The STIHL MS 391 is a gas-powered chainsaw for felling trees, cutting firewood and cleaning up after storms. It uses STIHL engine technology that lowers fuel consumption and exhaust emissions compared with other chainsaw models. It weighs the same as the MS 311 but is more powerful.
The IntelliCarb compensating carburetor adjusts the air/fuel ratio automatically when the air filter becomes restricted or partly clogged, which keeps the engine at the correct RPM. A pre-separation air filtration system removes heavier dirt by centrifugal force before the air reaches the filter. This doubles the time between air filter cleanings.
The saw has an anti-vibration system to reduce operator fatigue and bumper spikes that prevent pull-in and improve control. The side-access chain tensioner lets the user adjust the chain with a bar wrench. The fuel and oil caps open and close without tools and have retainers. A single Master Control Lever operates the choke, starting throttle lock and on-off switch, and a throttle trigger lockout must be depressed before the trigger works. The housings are made of high-tech polymer that is lightweight, impact-resistant and corrosion-resistant.
