Maintain reliable cutting performance from your Stihl FS 46 string trimmer with genuine OEM replacement parts from Repair Clinic. The FS 46 is a residential-class straight-shaft trimmer in Stihl’s FS 46 line; the FS 46 C is a related variant with a slightly different handle or attachment configuration, and the FS 46-0 entries some customers search refer to the same base FS 46 platform. The FS 460 C and HS 46 C are different product categories (a higher-displacement trimmer and a hedge trimmer respectively) and do not share carburetor or cutting attachment parts with the FS 46 despite similar naming. Parts most frequently replaced include the carburetor, spark plug, air filter, fuel lines, ignition coil, and recoil starter assembly. Use the FS 46 parts list and browse the full Stihl trimmer parts catalog.
Stihl FS 46 Residential Platform: FS 46 C Cross-Reference and Distinguishing From FS 460 C and HS 46 C
The Stihl FS 46 is a residential straight-shaft string trimmer using a two-stroke engine that runs on a premixed gasoline-and-two-stroke-oil fuel blend. The FS 46 C shares the same engine, carburetor, and fuel system as the base FS 46, differing primarily in handle configuration. The FS 460 C is an entirely different and much larger commercial-class trimmer with a higher-displacement engine; the HS 46 C is a hedge trimmer, not a string trimmer at all. Despite similar model naming, the FS 460 C and HS 46 C do not share carburetor, fuel system, or cutting attachment parts with the FS 46; confirm the exact model designation before ordering. The FS 46 carburetor is sensitive to ethanol-blend fuel varnish during off-season storage. For repair guidance, visit the Stihl trimmer repair help section.
FS 46 Repairs: Diagnostic Sequences and Component Service
Stihl FS 46 Carburetor Varnish and Post-Storage Starting Failure
The FS 46 carburetor is the primary diagnostic target for any trimmer that fails to start after off-season storage. Ethanol-blend fuel deposits varnish on the diaphragm passages and needle seat during storage. A trimmer that cranks but will not fire, or starts briefly and stalls, has carburetor varnish in the majority of post-storage cases. Drain the fuel system before storage each winter. Browse Stihl trimmer carburetor parts.
FS 46 Ignition Coil Failure and No-Spark Diagnosis
A FS 46 that will not start despite confirmed fuel delivery and a good spark plug may have a failed ignition coil. Test for spark at the plug using a spark tester before condemning the ignition coil; a weak or absent spark with confirmed good plug and fuel delivery indicates ignition coil failure.
FS 46 Recoil Starter Assembly and Pull Cord Service
The recoil starter assembly houses the pull cord, recoil spring, and starter pulley. A pull cord that does not retract has a broken or unwound recoil spring; a cord that breaks near the handle requires full assembly replacement on most FS 46 units. The FS 46 parts list includes the full recoil starter assembly.
FS 46 Air Filter and Fuel Filter Annual Service
Replace the FS 46 air filter and fuel filter at the start of each trimming season. A clogged air filter causes rich running and power loss; a clogged fuel filter restricts fuel delivery and mimics carburetor varnish symptoms.
Stihl FS 46 Parts at Repair Clinic
- Genuine Stihl OEM Parts for the FS 46 Residential Platform: Every FS 46 part meets Stihl OEM specifications. Browse the full Stihl trimmer parts catalog.
- FS 46 vs FS 460 C vs HS 46 C Clarification: Our content clarifies that the FS 460 C and HS 46 C are different product categories that do not share parts with the FS 46 despite similar naming.
- FS 46 and FS 46 C Cross-Reference: Our listings confirm shared engine and fuel system components between the FS 46 and FS 46 C.
- 365-Day Returns and Fast Shipping: All FS 46 parts ship promptly. The Stihl trimmer repair help section provides step-by-step guidance.
Stihl FS 46 String Trimmer Parts FAQ
Are FS 46 parts the same as FS 460 C or HS 46 C parts?
No. Despite similar model naming, the FS 460 C is a much larger commercial-class trimmer with a higher-displacement engine, and the HS 46 C is a hedge trimmer, not a string trimmer. Neither shares carburetor, fuel system, or cutting attachment parts with the FS 46. Always confirm the exact model designation from your unit’s data plate before ordering parts.
Are FS 46 and FS 46 C parts interchangeable?
Yes, for the engine and fuel system. The FS 46 C shares the same two-stroke engine, carburetor, ignition coil, and fuel system as the base FS 46, differing primarily in handle configuration. Confirm handle-specific components against the FS 46 parts diagram before ordering from FS 46 C listings.
Why won’t my Stihl FS 46 start even with fresh fuel and a new spark plug?
If the FS 46 still will not start after confirming fresh fuel and a new spark plug, test for spark using a spark tester before replacing other components. No spark or weak spark with confirmed good fuel delivery indicates a failed ignition coil. This is a less common failure than carburetor varnish but should be tested when fuel-related fixes do not resolve a no-start complaint.
How do I rebuild the carburetor on my Stihl FS 46?
The FS 46 carburetor rebuild kit includes replacement diaphragms and the needle and seat assembly. Remove the carburetor, disassemble the metering chambers, replace the diaphragms and needle assembly with kit components, and reinstall. Replace the fuel lines and primer bulb at the same service since these deteriorate on a similar timeline as the carburetor diaphragms.
