Overview
Equipped with a simplified starting procedure, the FS 251 is a heavy-duty trimmer built for pros with no time to waste. Designed with a powerful low exhaust emission engine, the FS 251 saves users on fuel and operating costs without losing any of the power that they count on to get the job done. The FS 251s easy-to-adjust bike handles provide comfort and ease while tackling widespread, overgrown areas. With a rugged design that offers optimal maneuverability and a vertically-pleated paper air filter that provides an extended service life, users can get to work quicker and count on this gas trimmer to last longer.
Features
Powerful Low Exhaust Emission Engine
A powerful low exhaust emission engine saves users fuel and operating costs without losing the power they count on to get the job done.
STIHL ElastoStart™
The ElastoStart™ starter handle is a feature of STIHL. It is a starting grip with a built-in shock absorber that helps reduce the effort when pulling on the starter cord. The ElastoStart™ starter grip noticeably reduces the sudden peak forces (compression) normally felt during cranking. The forces which occur at the grip after the first compression stroke are smoothed out.
TapAction™ AutoCut® Cutting Head
TapAction™ allows users to adjust the line length simply by tapping the cutting head against the ground.
IntelliCarb™ Compensating Carburetor
The IntelliCarb™ Compensating Carburetor measures the air pressure on the clean side of the air filter and adjusts the metering diaphragm in the carburetor. This keeps the RPM at a consistent level, even when the air filter begins to clog.
Bike Handle
When used in conjunction with a harness, the bike handle allows the machine to be easily guided, enabling a smooth horizontal mowing action to cover large areas quickly and efficiently. With soft grips for increased comfort, the bike handle provides greater control and helps reduce operator fatigue.
Anti-Vibration System
STIHL has 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.
Shoulder Strap / Carrying System
Using a shoulder strap or carrying system helps distribute the weight of the equipment for increased operator comfort and improved maneuverability.
Tool-Free Handle Adjustment
The central wing nut enables easy adjustment without the use of tools. For transportation and space-saving storage, the handle can be rotated 90°.
Multi-Function Control Handle
Having easy access to all of the controls on one comfortable handle makes it easy to complete tasks so the operator’s hand never has to leave the handle.
Semi-Automatic Choke Lever
The semi-automatic choke lever enables the simplified three-step start procedure, saving users time and allowing them to start jobs faster.
Simplified Starting Procedure
To get started, users simply pump the fuel primer, set the choke, and pull the starter cord. The built-in stop switch allows the user to turn off the engine with a simple press of the button. When the engine is off, the throttle lock automatically returns to the "start" setting. The tool will be ready to start again when the user is ready to get back to work.
Vertical Pleated Paper Air Filter
Thanks to better air filtration due to its greater surface area, the vertical pleated paper air filter can extend the time between servicing.
Air Filter Cover
Easily remove the cover for fast and easy filter cleaning or replacement.
Protected or Enclosed Control Cables
Dangling and loose wires are eliminated.
Protected Spark Arrestor Muffler
Large baffles reduce noise level and contain a screen designed to reduce the emission of sparks.
Protected Spark Plug
The spark plug is protected yet easy to change.
Protected Choke Lever/Knob
The choke is protected to help prevent damage.
High-Tech Polymer Housing
Housings are lightweight, withstand greater impact, and are corrosion-resistant.
Heavy-Duty Steel-On-Steel Clutch
Centrifugal clutch is designed to reduce slippage.
Purge Pump Primer
By pressing the bulb, this small fuel pump delivers fuel to the carburetor, reducing the number of starting pulls needed after an extended break between uses.
Upright Translucent Fuel Tank
Easily check the fuel level before starting work. If fuel is needed, the upright position makes the tank easier to fill.
Fully-Lined Drive Shaft
A lined shaft provides smooth operation and less vibration.
Throttle Trigger Interlock
This safety feature must be depressed before the trigger can be activated.