Trimmer

Stihl FS 110 R

4-Mix · Also known as: FS 110

The Stihl FS 110 R is a 36.3cc 4-Mix straight-shaft professional trimmer sharing the same 4-stroke valve train engine as the FS 100, with slightly improved ergonomics and anti-vibration for production landscaping and heavy brush work. It accepts brush blades and the full Stihl attachment range. It runs a Walbro carburetor . Valve clearance inspection approximately every 50 hours, gearhead grease repacking, and fuel system service are the primary commercial maintenance tasks beyond standard spark plug and air filter replacement.

See a wrong fitment? Report a correction.

Verify before ordering: Fitment can vary by serial number, production date, region, and sub-model. Match the OEM number and physical dimensions before ordering.

Equipment: Trimmer · 4-Mix
Covered Parts: Spark Plug, Air Filter, Fuel Filter, Carburetor, Recoil Starter, Ignition Coil, Primer Bulb, Fuel Line Kit, Trimmer Head, Trimmer Line
OEM References: 0000 400 7009, 4180 120 1800, 0000 350 3502, 4180 120 0613, 4180 080 2102, 4180 400 1300, 4226 121 2700, 4180 350 1402, 4002 710 2193
Model Family: FS 90 R, FS 100, FS 110, FS 111 R, FS 130 R, FS 131 R
Last Reviewed: Not yet independently reviewed
Data Confidence: Not yet independently reviewed
Sources Consulted: Evidence source not recorded

Quick Fitment

Part Type	OEM / Spec	Common Option	Confidence
Spark Plug	0000 400 7009	NGK CMR5H	Confidence not assigned · Not yet independently reviewed
Air Filter	4180 120 1800	OEM 4180 120 1800	Confidence not assigned · Not yet independently reviewed
Fuel Filter	0000 350 3502	OEM 0000 350 3502	Confidence not assigned · Not yet independently reviewed
Carburetor	4180 120 0613	Zama C1Q-S230	Confidence not assigned · Not yet independently reviewed
Primer Bulb	4226 121 2700	Zama 0057004	Confidence not assigned · Not yet independently reviewed
Trimmer Head	4002 710 2193	Oregon 55-266	Confidence not assigned · Not yet independently reviewed
Recoil Starter	4180 080 2102	Stens 150-570	Confidence not assigned · Not yet independently reviewed
Ignition Coil	4180 400 1300	OEM 4180 400 1300	Confidence not assigned · Not yet independently reviewed

Tune-Up Kit

Common service bundle: spark plug, air filter, fuel filter, carburetor, primer bulb, fuel line kit.

Maintenance Interval

Inspect filters and fuel lines each season, replace spark plugs during annual service, and service carb/fuel-system parts when starting or idle symptoms appear.

Before You Buy

Confirm the full model is Stihl FS 110 R, not just the family name.
Check serial number, production date, and regional variant before ordering.
Match the old OEM number stamped on the removed part when available.
Compare dimensions, plug gap, thread, fuel line diameter, or chain pitch/gauge where applicable.

Common Mistakes

Ordering from a family listing without checking the exact sub-model.
Buying a kit that includes the headline part but wrong gaskets, lines, or bulb size.
Choosing the wrong carburetor revision when multiple versions were used.
Assuming all fuel line kits use the same diameter and routing.
Installing the correct plug number with the wrong gap.

Symptoms Map

Won't start

Spark plug, fuel filter, primer bulb, carburetor

Starts then dies

Fuel filter, fuel line kit, carburetor

Bogs under throttle

Air filter, carburetor, spark plug gap

Primer will not fill

Primer bulb, fuel line routing, in-tank filter

Replacement Options

Best OEM equivalent

Start with OEM references 0000 400 7009, 4180 120 1800, 0000 350 3502, 4180 120 0613 and match the removed part before choosing a listing.

Common aftermarket option

Cross-check aftermarket listings such as NGK CMR5H (spark plug), Zama C1Q-S230 (carburetor), Stens 150-570 (recoil starter) against the OEM number and dimensions.

Best for annual tune-up

Bundle spark plug, air filter, fuel filter when servicing the Stihl FS 110 R at the start of the season.

Best if replacing fuel system

Compare the fuel filter, carburetor, primer bulb, fuel line kit together so line routing, bulb size, filter style, and carburetor connections match.

Best budget kit

Use kit listings only when every included part matches this model page; cheap kits often mix correct headline parts with wrong bulbs, lines, or gaskets.

FAQ

Should I buy OEM or aftermarket parts for the Stihl FS 110 R? Use OEM when the part controls fuel metering, ignition, or safety. Aftermarket kits can be useful for routine filters, bulbs, plugs, and tune-up bundles when the OEM number and dimensions match.

How do I avoid ordering the wrong carburetor for the FS 110 R? Match the carburetor number stamped on the removed unit, then compare linkage, choke setup, primer routing, gasket stack, and fuel-inlet direction.

What should I check before replacing fuel-system parts? Photograph the old fuel-line routing, match line diameter and filter style, and compare primer bulb size before buying a kit.

Spark Plug

OEM0000 400 7009Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Dimensions: 0.7mm gap
Variant notes: 10mm thread (CMR5H) — do not substitute BPMR7A (14mm thread)

Brand	Part #
NGK	CMR5H	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Air Filter

OEM4180 120 1800Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: Also fits FS 87, FS 90, FS 100, FS 130

Brand	Part #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Fuel Filter

OEM0000 350 3502Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: In-tank pickup filter

Brand	Part #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Carburetor

OEM4180 120 0613Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: Zama C1Q-S230; 4-Mix diaphragm carb

Brand	Part #
Zama	C1Q-S230	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Recoil Starter

OEM4180 080 2102Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: Fits FS 90 R, FS 100, FS 110, FS 130 R

Brand	Part #
Stens	150-570	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Ignition Coil

OEM4180 400 1300Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: Fits FS 90 R, FS 100, FS 110, FS 130 R

Brand	Part #
No aftermarket listing is published for this part yet. Use the OEM reference and verify with a dealer or service manual before ordering.

Primer Bulb

OEM4226 121 2700Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed

Brand	Part #
Zama	0057004	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
Hipa	G002-H	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Line Kit

OEM4180 350 1402Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: Includes fuel pickup line and return line; replaces 4180 358 7700

Brand	Part #
Hipa	4180 350 1402	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Trimmer Head

OEM4002 710 2193Confidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Variant notes: AutoCut C 26-2; bump-feed

Brand	Part #
Oregon	55-266	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Trimmer Line

OEMSpec-based fitmentConfidence: Confidence not assigned · Source: Evidence source not recorded

Reviewed: Not yet independently reviewed
Dimensions: .095" diameter, round

Brand	Part #
Oregon	22-895	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
Arnold	490-095-0100	Search AmazonAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.