Used Stihl FS 80 Trimmer (Valuation & Specs)
A used STIHL FS 80 is a 25.4 cc, two-stroke trimmer or brushcutter, not a chainsaw. In the U.S. private-sale market, a complete, running example in sound condition often falls around $100–$250; a nonrunning or incomplete one may be worth $40–$100. Confirm the model, test it cold and warm, and price repairs before buying.
Waterproofing is not a selling feature to assume on an older FS 80: do not treat the machine as waterproof or submerge it. Rain exposure, water in the fuel, and damp storage can all affect a used trimmer’s condition. If you are weighing a purchase because your current yard tools keep failing at season change, focus on what you can test: starts, idle, throttle, shutoff, leaks, and the condition of its approved cutting setup.
FS 80 specifications and model checks
The FS 80 is a gas-powered, air-cooled, single-cylinder, two-stroke trimmer or brushcutter. Specifications can vary by market and version, so use the model’s manual and its identification markings as the final reference, especially when checking fuel capacity, compatible attachments, and service details.
| Specification | Commonly listed value | What to check |
|---|---|---|
| Displacement | 25.4 cc | Confirm the model marking; avoid relying on a seller’s description alone. |
| Engine | Single-cylinder, air-cooled, two-stroke | The engine needs the correct gasoline-and-oil mixture. |
| Rated output | About 0.95 kW (1.3 hp) | Published wording and test standards can differ by market. |
| Fuel mix | 50:1 with suitable two-stroke oil | That is 20 mL of oil per 1 L of gasoline. Check the manual and oil maker’s directions. |
| Fuel capacity | About 0.44 L | Verify against the exact version’s manual or tank markings. |
A model name alone does not confirm what attachments are safe to use. Check the manual for the exact FS 80 version, then verify that the cutting attachment, guard, handle, and harness are approved and fitted as specified. The FS 80 is not designed for chainsaw bars, chains, or felling work.
Before buying, look for a legible model label and compare the machine’s parts with the manual. A missing guard or a mismatched head can turn an inexpensive trimmer into a repair project. Do not assume that an attachment fits safely just because it can be mounted.
Used FS 80 value and price factors
A fair price reflects verified condition, completeness, and local demand, not the seller’s claim that the trimmer “ran last year.” A working engine is only part of the value: the gearbox, shaft, cutting head, guard, and controls also need to be sound. Use the ranges below as U.S. private-sale estimates, not fixed market prices.
| Condition | Approximate value | Buying approach |
|---|---|---|
| Complete, runs and cuts; sound gearbox, guard, and usable head | $100–$250 | Pay toward the higher end only when cold and hot operation checks out and the setup is complete. |
| Very clean, demonstrably sound, with useful approved attachments | May ask more | Compare local listings and confirm each attachment is correct for the model. |
| Nonrunning or incomplete | $40–$100 | Buy only if parts are available and expected repair costs make sense. |
| Unclear history, fuel leaks, damaged guard or blade, or major mechanical noise | Avoid or price as parts | Do not treat an uncertain “easy fix” as a verified repair. |
“Runs” should mean more than firing briefly with the choke on. Ask to see a cold start, stable idle, throttle response, shutoff, and a hot restart after the engine has warmed. If the seller cannot demonstrate these, value the trimmer as unverified rather than as a fully working unit.
I compare the asking price with the cost of missing parts and likely service before deciding. A low price can still be poor value if it needs a head, guard, fuel-system work, or gearbox repairs. Keep a repair reserve, and do not count an untested attachment as an added benefit.
Pre-purchase inspection: what to test
A careful inspection can reveal common faults before money changes hands. Start with the engine cold, then check the machine’s controls and cutting components. Stop the inspection if you find fuel leaks, unsafe attachment parts, or a cutting head that turns while idling; those are not details to overlook.
- Cold start: Ask the seller not to warm the engine before you arrive. Follow the manual’s cold-start steps on stable ground, with the attachment clear of people and objects. Note whether it starts and runs without repeated, unexplained adjustments.
- Idle and throttle: Let it idle, then gently test throttle response. The throttle should return when released, and the trigger lockout should work. The cutting attachment must not rotate at idle.
- Warm restart and stop switch: After a short run, stop the engine and try a warm restart using the manual’s procedure. Test the stop switch. A trimmer that starts cold but will not restart warm needs diagnosis.
- Fuel system and air intake: Inspect the tank, cap, fuel lines, and accessible filter for damage or leaks. Check the air filter and spark plug condition. Dirt, worn parts, or old fuel can contribute to starting trouble, but inspection alone does not prove the cause.
- Starter, shaft, and gearbox: Pull the starter smoothly without forcing it. Look for damage or looseness along the drive shaft and check for abnormal gearbox or bearing noise. A rough sound or excessive play calls for closer inspection.
- Cutting setup: Confirm the head or blade is secure and undamaged, the guard is present and correct, and the handle and harness arrangement match the manual. Reject cracked guards, damaged blades, loose retention, or an unsuitable attachment.
Field inspection examples
These are decision scenarios, not reports of specific customer repairs. They show how I would apply the same checks to different used FS 80 listings.
- A complete trimmer starts cold, idles steadily, responds to throttle, shuts off, and restarts warm. If the gearbox is quiet and its approved head and guard are in usable shape, compare the asking price with the $100–$250 range and local listings.
- A seller says the trimmer ran last season, but it will not start today. Treat it as nonrunning. Check for leaks and missing parts, estimate parts and labor, then consider it only if the $40–$100 range and repair math leave room for uncertainty.
- An engine runs well, but the guard is cracked or the blade is damaged. Do not operate it in that condition. Price a correct replacement and confirm it is approved for the exact model before deciding whether the purchase still makes sense.
Safe setup and first use
Correct setup means fitting only attachments, guards, handles, and harnesses approved for the exact FS 80 version and installing them as specified. The machine is for trimming or brushcutting, not chainsaw work. Before starting, check the manual, inspect the work area, and confirm the attachment is secure and suitable for the job.
Wear eye and face protection, hearing protection, gloves, long trousers, sturdy boots, and the specified harness. Use leg protection suited to the cutting attachment. Clear people, pets, stones, wire, and other objects that could become projectiles; follow the attachment maker’s required exclusion distance.
Start on stable ground with the attachment clear of people and objects. Use the manual’s cold- or warm-start procedure. Confirm that the engine idles without the head or blade turning, test throttle response, and verify the stop switch before cutting.
Keep both hands on the approved handles and keep the attachment below waist level. Use trimmer line for grass and edging. Use a brush knife only if the FS 80 version and its manual approve it, with the matching guard and harness. Make controlled sweeps and avoid striking fences, rocks, or tree trunks.
A metal brush knife can catch or hit a rigid object, causing sudden kickout and throwing debris. Stop immediately if the blade is loose, damaged, or repeatedly catching. When finished, switch off and wait for the attachment to stop fully; let hot parts cool before handling. Clean debris and inspect the head or blade, guard, fasteners, and gearbox before the next use.
Fuel, maintenance, and seasonal storage
Routine care helps reduce avoidable starting trouble, but it cannot repair worn or damaged parts. Use fresh fuel mixed to the model’s specified ratio, keep the air and cooling paths clear, and follow the manual for inspection intervals and service limits. Do not guess carburetor settings or engine speeds.
For the commonly specified 50:1 mixture, use 20 mL of suitable two-stroke oil per 1 L of gasoline. Confirm the ratio in the exact machine’s manual and follow the oil maker’s directions. Fuel age or appearance does not tell you what mixture is in the tank. Store fuel in an approved, labeled container.
Clean or replace the air filter as directed. Inspect the fuel filter, lines, spark plug, cooling-air passages, starter, and cutting attachment regularly. For carburetor work, use only model-specific settings and service limits from the manual or qualified service information. Turning adjustment screws to hide a fault can make diagnosis harder.
Use the line size and type allowed for the fitted head. Sharpen a metal blade only to its specified profile and balance. Replace blades that are cracked, bent, badly worn, or cannot be balanced safely. For extended storage, follow the manual’s fuel-system procedure, keep the machine cool, dry, and secured, and cover the cutting attachment. Keep fuel away from ignition sources and follow local fire rules.
FAQ: buying a used STIHL FS 80
How much is a used STIHL FS 80 worth?
A complete, demonstrably running example with a sound gearbox, guard, and usable head commonly falls around $100–$250 in U.S. private sales. Local prices and attachments can change that range.
What is a nonrunning FS 80 worth?
A nonrunning or incomplete unit may be worth about $40–$100, but only if parts and repair costs justify the purchase. Treat “ran last year” as unverified.
What is the engine displacement?
The FS 80 is commonly specified at 25.4 cc. Check the model identification and the manual for your exact version.
What fuel mixture does it use?
The commonly specified mix is 50:1 with suitable two-stroke oil, equal to 20 mL oil per 1 L gasoline. Verify the manual and oil maker’s directions.
What is its rated power?
A commonly listed figure is about 0.95 kW, or 1.3 hp. Published specifications and test standards can vary by market.
How can I tell whether it is in good running condition?
Check cold start, stable idle, throttle response, throttle return, shutoff, and warm restart. Also inspect for leaks, unusual gearbox noise, and an attachment that turns at idle.
Can an FS 80 use a brush knife?
Only if that attachment is approved for the exact model and fitted with its specified guard, handle, and harness. Check the manual rather than assuming compatibility.
Can I use chainsaw parts or specifications on it?
No. The FS 80 is a trimmer or brushcutter, not a chainsaw. Do not apply chainsaw bar, chain, or felling specifications.
Why does the cutting head turn at idle?
That is a safety fault that needs diagnosis and correction before operation. Do not buy or use the machine as ready to work until the cause is fixed.
Is the FS 80 waterproof?
Do not assume it is waterproof. Avoid submersion and inspect any unit with signs of water exposure, especially around the fuel system, controls, and storage areas.
(This article was written by one of our staff writers, Harrison Croft. Visit our Meet the Team page.)
