A used Stihl FS 40 C string trimmer typically sells for $75-$160, with clean, working examples near $120. Age, starting condition, included cutting equipment, local demand, and whether the machine needs carburetor or fuel-system work account for most price differences.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Used FS 40 C, running | $50 | $120 | $200 | Price depends on wear, accessories, and local availability |
| Nonrunning or repair project | $20 | $50 | $90 | Value depends on parts condition and repair needs |
| Basic tune-up after purchase | $40 | $90 | $160 | Independent small-engine shop estimate |
| Replacement trimmer | $150 | $220 | $300 | New entry-level gas models vary by brand and season |
Assumptions: U.S. private-party sale, standard used condition, ordinary local pickup, and no major engine damage.
What a running FS 40 C is worth used
A typical private-party price is $75-$160 for a complete FS 40 C that starts cold, idles steadily, and trims under load. About $100-$135 is a reasonable target for a used unit with visible wear but no known mechanical issue. A freshly serviced machine with a guard, handle, and usable cutting head may reach $160-$200 in a market with limited supply.
For a standard, working trimmer, budgeting around $120 is a practical starting point. Listings above $200 deserve comparison with newer equipment; the FS 40 C is an older homeowner model, and a high asking price does not guarantee recent service. Prices are asking-price estimates rather than guaranteed sale values, and local classifieds can differ substantially.
How engine, parts, and tune-up costs shape the deal
The purchase price is only part of the cost if the seller cannot demonstrate operation. A shop can charge a diagnostic or minimum labor fee, while common wear parts may be inexpensive individually but add up when several need replacement.
| Quote item | Low | Average | High | Typical scope |
|---|---|---|---|---|
| Used trimmer | $50 | $120 | $200 | Private sale, condition dependent |
| Shop labor | $60 | $90 | $130 | About 1-1.5 hours at $60-$90 per hour |
| Spark plug and filter | $8 | $18 | $35 | Basic service items, parts only |
| Fuel-system parts | $15 | $35 | $70 | Fuel line, filter, or carburetor parts |
| Cutting head or guard | $15 | $35 | $65 | Replacement part, fit and quality vary |
A $100 purchase can become a $200-$300 expense after shop labor and needed parts. Full carburetor replacement or engine work can exceed the value of an older trimmer, so obtain a repair estimate before authorizing extensive work.
Which FS 40 C condition details move the price
Starting behavior matters more than clean plastics. A unit that starts cold and hot, accelerates without hesitation, and runs for several minutes is worth more than one demonstrated only after warming up. Ask whether it has been stored with old fuel; stale fuel can cause hard starting, but symptoms may also point to fuel-line, carburetor, or compression problems.
Inspect the drive shaft, throttle trigger, stop switch, guard, and cutting head. Missing small parts may be manageable, while a cracked housing or damaged shaft can make the deal uneconomical. Deduct roughly $20-$50 for a missing or damaged cutting head, guard, or similar replaceable item. A machine that will not start should generally be valued as a repair project, not priced like a tested runner.
When does a nonrunning trimmer make financial sense
A $20-$60 project can be worthwhile for someone able to diagnose and repair small engines, especially if the shaft and engine appear intact. For a buyer paying a shop, a nonrunner at $80-$90 leaves little room for a repair bill. Ask the seller what failed, when it last ran, and whether it was stored with fuel in the tank; vague answers increase uncertainty.
Compare the purchase plus repair estimate with a replacement. If the combined amount approaches $180-$220, a new entry-level trimmer may offer a clearer warranty and lower immediate risk. Set a maximum project price before buying, including parts, shop minimums, and pickup.
How local demand changes FS 40 C asking prices
Private-sale prices can run about 10%-20% higher in dense suburban areas during spring, when yard work begins and ready-to-use tools move quickly. Rural listings may be 5%-15% lower where buyers have more options or must travel farther, although scarce local supply can reverse that pattern. These are planning ranges, not fixed regional price rules.
Season also affects negotiation. Spring and early summer bring more demand; late fall and winter can yield lower asking prices, commonly by 10%-20%, but buyers may have less opportunity to test a machine in active use. Compare several nearby listings with similar running condition rather than relying on a single advertised price.
What a real purchase budget looks like at three prices
| Example | Trimmer | Added expense | Estimated total |
|---|---|---|---|
| Clean runner with head | $140 | $10 fuel and line | $150 |
| Average runner needing service | $100 | $70 tune-up and parts | $170 |
| Nonrunner with shop diagnosis | $45 | $90 diagnosis, before repair | $135 before repair |
The third example can quickly become the most expensive if the shop identifies major engine or fuel-system work. Use the out-the-door amount, not the seller’s price alone, to compare offers. Confirm whether the machine includes a usable head, guard, and any manuals or service records before agreeing on the total.
Which replacement costs compare with a used FS 40 C
A newer entry-level gas trimmer commonly costs about $150-$300, while battery kits with a battery and charger often fall around $180-$400 depending on voltage and included equipment. A battery unit can cost more initially but avoids gasoline mixing and some small-engine service. A used FS 40 C is most attractive when it is tested, complete, and priced well below a comparable new model.
Professional repair is a less appealing substitute when the machine needs both shop labor and major parts. Compare used purchase plus immediate repairs against the price of a complete replacement, including battery and charger when relevant. A replacement price is not a direct match for performance, but it provides a useful ceiling for an uncertain repair project.
How to negotiate the FS 40 C price without overpaying
Ask to see a cold start, then test throttle response and shutoff. Check the model label, inspect the fuel tank and lines, and confirm that the cutting head spins safely. Bring the likely cost of missing parts into the offer, and avoid paying a premium for claims of recent service unless the seller can describe the work or show a receipt.
For a working but worn example, an offer around $80-$110 may be reasonable when comparable local machines are available. A clean, demonstrated runner can justify more, while a nonrunner should be priced with repair risk in mind. Keep a $30-$50 reserve for line, fuel, a plug, or other first-use needs. Set a firm ceiling before meeting the seller and walk away if the machine cannot be tested and the price assumes perfect condition.