The largest diameter trimmer line recommended is 0.105".
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Stihl FS Series Gas-Powered Straight Shaft String Trimmer, 16 1/2in. Cutting Width, 36.3cc, 1.9 HP, Model# FS 131 R

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- Simplified starting with semi-automatic choke lever and one-touch stop
- Low emission STIHL engine delivers dependable power and fuel efficiency with a larger fuel tank that delivers 30% longer run times when compared to previous models
- AutoCut® tap and go cutting head automatically feeds out new line with just a tap on the ground
- Shoulder strap carrying system with support strap helps evenly distribute equipment weight for increased operating comfort and maneuverability
- Adjustable front handle for maximum operating comfort
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Description
Key Specs
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Q & A
Accessories
Warranty
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Product Summary
What's Included
- (1) String trimmer
Features + Benefits
- Simplified starting with semi-automatic choke lever and one-touch stop
- Low emission STIHL engine delivers dependable power and fuel efficiency with a larger fuel tank that delivers 30% longer run times when compared to previous models
- AutoCut® tap and go cutting head automatically feeds out new line with just a tap on the ground
- Shoulder strap carrying system with support strap helps evenly distribute equipment weight for increased operating comfort and maneuverability
- Adjustable front handle for maximum operating comfort
- Fully-lined drive shaft provides smooth operation and less vibration
- Lightweight, high-tech polymer housing withstands hard impacts and is corrosion resistant
- Protected choke lever/knob helps prevent accidental damage
- Easy access multi-function control handle has start/run/stop controls located right on the handle for comfort and easy task completion without having to remove hands from the handle
- Throttle Trigger interlock system helps prevent accidental activation
- Easy access air filter cover for fast and easy filter cleaning or replacement
- Protected/enclosed control cables eliminate dangling and loose wires
- Heavy-duty steel-on-steel centrifugal clutch is designed to reduce slippage
- Easy-to-change spark plug is protected from the elements
- Spark arrestor muffler features large baffles to reduce noise level and a screen helps reduce the emission of sparks
- Upright, translucent fuel tank for quick, one-glance fuel level checks
- Purge pump primer delivers fuel directly to the carburetor to help promote quicker starts
- Reduced emission engine technology produces zero or low exhaust emissions that are cleaner than EPA and/or CARB exhaust emission standards
- Rubberized loop handle design provides a comfortable grip and exceptional control for easier trimming between bushes, shrubs and other areas where space is limited
- As an authorized STIHL dealer, Northern Tool + Equipment provides in-store service and warranty support for STIHL gas-powered equipment shipped directly to you. For return inquiries, please contact Customer Care for assistance.
Key Specs
| Attribute | Specification |
|---|---|
item# | 63943 |
Brand | Stihl |
Manufacturer's Warranty | 2 year limited warranty |
Ship Weight | 18.0 LB |
Product Type | Trimmers |
Primary Power Source | Gas |
Max. Cutting Width | 16.5 in |
Cutting Width (in.) | 16 1/2 |
Displacement (cc) | 36.3 |
| Attribute | Specification |
|---|---|
Fuel Tank Capacity (qt.) | 0.75 |
Engine Displacement | 36.3 cc |
Fuel Tank Capacity | 0.75 qt |
Cordless | Yes |
Horsepower | 1.9 HP |
Line Diameter | 0.095 in |
Shaft Type | Straight |
Tool Weight | 12.1 |
Reviews
Questions & Answers
Questions
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Anonymous· a year ago
What size string line
1 answer-
ProductExpert11· a year ago
Helpful?
-
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· 2 years ago
Chainsaw attachment
1 answer-
ProductExpert23· 2 years ago
The Stihl FS Series gas-powered straight shaft string trimmer (Model FS 131 R) itself does not have a chainsaw attachment.
Helpful?
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· 6 years ago
i looking for brush cutter .Does this unit use brush blade for cutting heavy brush . when i say blade, i mean a round toothed blade. Should i be looking at a different unit? please provide specifics asi thought this unit was solid shaft brush cutter.
1 answer-
ProductExpert38· 6 years ago
This uses a string trimmer head, a blade attachment is unavailable for this model.
Please view powerhead item 63934, and blade attachment item 63937 for the combination you seek.Helpful?
-
Accessories We Recommend
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Warranty
Manufacturer's Warranty
2 year limited warranty
Extend Your Warranty Coverage with a Northern Protection Plan (NPP)
Repair Plan — 1 Year
A Northern Protection Plan is available after adding the product to your shopping cart.
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Specifications
Trimmers
Trimmers
Multi-task tool
Trimmers
Gas
Battery
-
Gas
16.5 in
15 in
-
15 in
16 1/2
15
-
15
36.3
-
27.2
27.2
0.75
-
11.5 oz.
0.359
36.3 cc
-
27.2 cc
27.2 cc
0.75 qt
-
0.35 qt
0.359 qt
Yes
Yes
Yes
Yes
1.9 HP
-
1.07 HP
0.94 HP
0.095 in
0.095 in
-
0.08 in
Straight
Straight
Straight
Curved
12.1
9.9 lbs. w/AP 300 battery
9.5
9.9




