Stihl Commercial String Trimmer with Bike Handle & IntelliCarb Technology -STI-FS131-AUTO

Stihl Commercial String Trimmer with Bike Handle & IntelliCarb Technology -STI-FS131-AUTO

The Stihl FS 131 is a professional-grade string trimmer designed for landscaping professionals seeking a powerful and efficient trimming solution. This bike-handle trimmer features a low-emission, 36.3cc engine and a larger fuel tank than its predecessor, providing 30% longer run times. The bike-handle design includes rubberized grips for enhanced comfort and control.

Features

• Bike handle design: Includes rubberized grips for enhanced grasp and comfort, allowing for smooth horizontal mowing actions.
• IntelliCarb technology: Stihl's exclusive technology offers premier air filtration and optimal engine performance.
• Solid steel drive shaft: Accepts a wide range of heavy-duty cutting heads, including metal blades.
• Anti-vibration system: Reduces vibration levels to minimize operator fatigue and provide a more comfortable working experience.
• Tool-free handle adjustment: Enables easy adjustment of the handle without the use of tools.
• Straps and harnesses: Distributes the weight of the equipment, increasing operator comfort and maneuverability.
• Protected choke lever/knob: Helps prevent damage to the choke lever.
• Multi-function control handle: Provides easy access to all controls on one comfortable handle.
• Throttle trigger interlock: Ensures safety by requiring the interlock to be depressed before the trigger can be activated.
• Upright translucent fuel tank: Allows easy checking of the fuel level and simplifies refueling.

Specifications

What our Experts Think

• The STIHL FS 131 AutoCut Bike Handle Trimmer is a professional-grade commercial brushcutter designed for heavy vegetation control, edging, and large-area trimming.
• Powered by a 36.3 cc STIHL 4-MIX engine (~1.9 HP), it delivers strong torque with lower emissions and improved fuel efficiency for extended work cycles.
• The bike handle (loop + bar grip) configuration provides superior control and stability, especially when using wider cutting paths or blade attachments.
• Equipped with IntelliCarb™ compensating carburetor technology, it maintains consistent RPM even as the air filter becomes restricted, ensuring stable performance in dusty conditions.
• The AutoCut tap-to-advance trimmer head enables fast line adjustment during operation, improving efficiency on large trimming jobs.
• A rigid steel drive shaft and commercial-grade gearbox allow compatibility with heavy-duty nylon heads and metal blades for brush clearing.
• Best suited for farm, estate, roadside, and landscaping professionals who need reliable power for thick grass, weeds, and light brush clearing.
• A durable “workhorse” trimmer that balances power, control, and long-run reliability for demanding commercial use.

Q&A

Q: What is the STIHL FS 131 Commercial String Trimmer (Bike Handle with IntelliCarb) – STI-FS131-AUTO?
A: A professional-grade gas string trimmer designed for landscapers and heavy-duty property maintenance, featuring a 36.3 cc engine, bike-style handle, and STIHL IntelliCarb™ compensating carburetor for consistent power even as the air filter loads.

Q: What makes the bike handle design useful?
A: The bicycle-style handle with harness support improves control during horizontal trimming, making it easier to cover large areas efficiently while reducing operator fatigue.

Q: What is IntelliCarb™ technology?
A: It is STIHL’s air-pressure–sensing carburetor system that automatically adjusts fuel-air mixture to maintain stable RPM, helping keep performance consistent even as the air filter becomes partially clogged.

Q: How powerful is it?
A: It produces about 1.9 HP (1.4 kW) from a 36.3 cc engine, giving strong cutting performance for thick grass and light brush clearing.

Q: Is it built for commercial use?
A: Yes. It includes anti-vibration system, solid drive shaft, and compatibility with heavy-duty cutting heads (including metal blades), making it suitable for professional landscaping work.

Q: What kind of cutting work is it best for?
A: Ideal for large lawns, roadside trimming, fence-line clearing, and dense overgrowth, especially where continuous, high-efficiency trimming is needed.

Q: What are its main advantages over lighter trimmers?
A: It offers more torque, wider cutting path, and better ergonomics with harness support, making it significantly more efficient for large-scale or commercial trimming jobs.

Maintenance Tips

• Clean after every use: Remove grass, sap, and debris from cutting head, guard, shaft, and cooling vents using a brush or cloth.
• Cutting head care: Inspect AutoCut head regularly; replace trimmer line when worn and ensure proper line feed for efficient cutting.
• Air filter maintenance (IntelliCarb system): Clean or replace air filter regularly to maintain consistent engine performance and fuel efficiency.
• Fuel system care: Use fresh fuel mix; avoid stale fuel and drain tank for long-term storage to prevent carburetor issues.
• Spark plug check: Inspect periodically for carbon buildup and replace if starting becomes difficult or engine runs unevenly.
• Gearbox lubrication: Grease the gear head regularly to ensure smooth rotation and reduce wear during heavy commercial use.
• Handle & shaft inspection: Check bike handle mounts and shaft connections for tightness due to vibration during operation.
• Cooling system: Keep engine cooling fins free of dust and grass buildup to prevent overheating.
• Safety check: Ensure throttle trigger, stop switch, and guard are functioning properly before each use.
• Storage: Store in a dry place, empty fuel tank for long-term storage, and keep trimmer head clean and protected.