The STIHL MS 251 WOOD BOSS® chainsaw is designed to deliver all the power you’d expect from STIHL equipment with a comfortable and ergonomic design. The MS 251 WOOD BOSS® is perfect for felling small trees, pruning and thinning, and cutting firewood simply and efficiently. With up to a 20 percent increase in fuel savings and a 50 percent reduction in exhaust emissions—when compared to previous models—you can enjoy a longer run time while feeling good about your impact on the environment. Features like a Master Control Lever™ and reduced vibration make the STIHL MS 251 WOOD BOSS® a lean, easy-to-use machine that still packs plenty of power.

• IntelliCarb™ Compensating Carburetor - The IntelliCarb™ Compensating Carburetor is designed to automatically adjust the air/fuel ratio when the air filter becomes restricted or partially clogged and maintains the engine’s correct RPM. IntelliCarb™ uses air from the clean side of the air filter to control the diaphragm and flow of fuel. As the air filter becomes dirty and less air is available for the carburetor, the IntelliCarb™ system adjusts the fuel flow to compensate for the decrease in air flow. This is in contrast to typical carburetors that utilize this air from the “dirty” side of the air box.
• Bumper Spikes - These spikes prevent pull-in and provide better control, making cutting easier.

• Toolless Fuel and Oil Caps with Retainers - Simply lift the lever and twist the caps to remove or tighten. There’s no need to use a tool to tighten or loosen.
• Anti-Vibration System - STIHL has developed a system for minimizing the vibration levels of handheld outdoor power equipment. The STIHL anti-vibration system helps reduce operator fatigue and provides a more comfortable working experience.
• Master Control Lever™ - The Master Control Lever™ is an easy-to-use single lever, operating the choke, starting throttle lock, and on-off switch. The operator must pull the throttle trigger before moving the Master Control Lever™ to the choke position.
• Throttle Trigger Lockout - This safety feature must be depressed before the trigger can be activated.
• High-Tech Polymer Housings - Housings are lightweight, withstand greater impact, and are corrosion-resistant.
• Made in America - A majority of STIHL products sold in America are made in America of U.S. and global materials.

• Specifications

  POWER SOURCE	Gas
  POWERHEAD WEIGHT	11.0 lbs.
  GUIDE BAR LENGTH (Recommended)	18 in.
  OILOMATIC® CHAIN	.325" RM3
  CHAIN OIL CAPACITY	6.7 oz.
  ENGINE POWER	3.0 bhp
  FUEL CAPACITY	13.2 oz.
  DISPLACEMENT	45.6 cc
  INTENDED USE	Homeowner

  Note: STIHL recommends #3695 (23 RM3 68) OILOMATIC® saw chain and 18" 3005 810 7017 ROLLOMATIC® E guide bar combination. Compatible guide bar ranges: 16" to 18". The actual listed guide bar length can vary from the effective cutting length based on which powerhead it is installed on.