A used Stihl FS 100 RX typically costs about $150-$350, with clean, running examples averaging near $250. Because this discontinued 31.4 cc 4-MIX curved-shaft trimmer is usually sold secondhand, condition, maintenance history, included attachments, and local availability drive the price more than a standard new-retail price.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Used FS 100 RX | $150 | $250 | $350 | Running unit, typical wear to very good condition |
| Refurbished or serviced | $250 | $350 | $450 | Price depends on documented work and seller warranty |
| New old stock | $400 | $525 | $650+ | Uncommon; confirm condition and included items |
| Common repair visit | $75 | $150 | $300 | Basic tune-up through carburetor or fuel-system work |
What a running FS 100 RX usually costs
For a used machine that starts, idles, and cuts properly, a practical budget is $150-$350. Around $200-$275 is a reasonable target for an average example with normal cosmetic wear, a usable cutting head, and no obvious starting or running problem. Higher asking prices are more defensible when recent service is documented or accessories are included.
Condition matters more than the original list price on this discontinued model. A seller’s asking price is not a guarantee of value: verify the model marking, test the machine under load, and account for likely repairs. Assumptions: U.S. private-party pricing, standard cutting head, and a complete trimmer with normal access to replacement parts.
How engine, labor, and attachments shape the quote
A used FS 100 RX price usually covers the powerhead, curved shaft, handle, and cutting head, but the sale may not include fresh line or other accessories. A repair-shop purchase can also reflect inspection and setup work. Typical local repair rates run about $75-$125 per hour, often with a minimum diagnostic or service charge.
| Quote item | Typical price | What it can include |
|---|---|---|
| Used trimmer | $150-$350 total | Powerhead, shaft, handle, and basic cutting head |
| Shop inspection or tune-up | $75-$175 total | Checks, adjustments, and routine service; parts may cost extra |
| Carburetor or fuel-system repair | $100-$250 total | Cleaning or replacement, labor, and selected parts |
| Cutting head or guard parts | $20-$90 per item | Replacement depends on compatible part and assembly |
| Pickup or shipping | $0-$80+ total | Local collection may be free; shipping varies by size and seller |
Ask whether the quoted price includes parts, labor, and a running test. For example, 1.5 hours of shop labor at $90 per hour adds $135 before parts or taxes.
Why 31.4 cc condition and starting behavior change value
The FS 100 RX’s 31.4 cc 4-MIX engine makes cold-start behavior and steady operation important checks. A machine that starts cold, idles without stalling, accelerates cleanly, and keeps cutting under load merits more than a non-running unit. Ask the seller not to warm it before arrival; an already-hot engine can hide a difficult cold start.
Wear on the curved shaft, handle, guard, throttle, and cutting head can add repair expense. Missing or damaged parts may cost $20-$90 each, while a fuel-system problem can turn a low purchase price into a poor deal. Subtract likely repair bills from the seller’s price before comparing listings. A compression or shop inspection can be worthwhile when the engine’s history is unknown.
Used, refurbished, or newer trimmer price comparison
A private-party FS 100 RX is generally the lowest-cost route, but it offers limited recourse if a fault appears later. A shop-serviced example may cost $250-$450 because the seller has spent time inspecting or repairing it. New old stock can reach $400-$650 or more, but the buyer should confirm that it is genuinely unused and ask what coverage, if any, applies.
Compare those prices with a newer Stihl trimmer or another current model before paying a premium for rarity. A basic new gas trimmer from a comparable brand may cost roughly $200-$400, while higher-grade models can exceed $400. Pay extra for the older FS 100 RX only when its condition, fit, or documented service justifies the difference.
Regional used prices and delivery can shift the total
Listings in high-cost metropolitan areas may run about 10%-20% above comparable rural listings, while regions with many landscaping contractors may have more used machines and greater price competition. These are general budgeting adjustments, not fixed market rules. Local demand, season, and the number of nearby listings can outweigh the region itself.
Shipping or a long-distance pickup can add $30-$80 or more, reducing the savings from a low online asking price. Before agreeing to delivery, confirm the unit’s condition, whether it can be shipped legally with its fuel tank empty, and who pays for packaging. Compare the delivered total, not only the listing price.
Repair estimates worth checking before buying
A routine tune-up may cost $75-$175, while carburetor or fuel-system work can reach $100-$250. Replacing a damaged cutting head, guard, or other small component may add $20-$90 per part. If the machine needs several repairs, request an itemized estimate and check whether the shop charges a diagnostic fee that is credited toward approved work.
For a trimmer listed at $175 that needs $160 in repairs, the effective cost becomes at least $335 before transport. That can approach the price of a serviced unit with fewer unknowns. Get a repair estimate before buying any FS 100 RX that will not start or run reliably.
How to keep an FS 100 RX purchase near budget
Compare several local listings, ask for a cold-start demonstration, and request clear photos of the model label, engine area, shaft, and cutting head. Set a maximum delivered price that includes anticipated service. A complete, running machine at a fair price is often a better buy than a cheaper trimmer missing parts.
Bring the seller’s asking price into line with evidence: recent receipts support a stronger offer, while a hard start, worn head, or missing guard supports a lower one. Avoid paying a collector-style premium unless condition and included equipment warrant it. For most buyers, a tested used unit around $200-$275 is the cost-conscious target.