Chainsaw

Echo CS-440

2-Stroke

The Echo CS-440 is a 40.2cc 2-stroke chainsaw in the same displacement class as the CS-400, designed for prosumer users who need 16" to 18" bar capability for regular production use. It runs a Zama carburetor and features improved anti-vibration relative to the CS-400. Positioned for users who cut frequently enough to notice the ergonomic improvements but don't require full professional-grade construction. Routine maintenance items are the spark plug, air filter, fuel filter, and primer bulb. Fuel system health is the primary factor in reliable cold-weather starting performance.

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: Chainsaw · 2-Stroke
Covered Parts: Spark Plug, Air Filter, Fuel Filter, Carburetor, Recoil Starter, Primer Bulb, Fuel Line Kit, Chain, Guide Bar, Ignition Coil
OEM References: 90023Y, 13031038331, A369000100, 12300039330, A180001210, 12318139130, 13200700760, A411000182
Model Family: CS-400, CS-440
Last Reviewed: 2026-05-20
Data Confidence: Aftermarket-confirmed
Sources Consulted: OEM part references, Aftermarket catalog cross-references, Retailer fitment listings

ℹ See also: CS-400 — parts are often interchangeable within this family.

Quick Fitment

Part Type	OEM / Spec	Common Option	Confidence
Spark Plug	90023Y	Champion CJ8Y	Medium · 2026-05-20
Air Filter	13031038331	Stens 605-319	Medium · 2026-05-20
Fuel Filter	A369000100	Stens 610-009	Medium · 2026-05-20
Carburetor	12300039330	Walbro WT-416	Medium · 2026-05-20
Primer Bulb	12318139130	Zama BG-00-4	Medium · 2026-05-20
Recoil Starter	A180001210	OEM A180001210	Low · 2026-05-20
Fuel Line Kit	13200700760	Stens 115-530	Medium · 2026-05-20
Chain	18", 3/8" LP pitch, .050" gauge, 62 drive links	Oregon 91PX062G	Low · 2026-05-20

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 Echo CS-440, 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.
Matching bar length but missing pitch, gauge, or drive-link count.

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

Cuts slowly

Chain pitch/gauge, bar wear, drive links

Replacement Options

Best OEM equivalent

Start with OEM references 90023Y, 13031038331, A369000100, 12300039330 and match the removed part before choosing a listing.

Common aftermarket option

Cross-check aftermarket listings such as Champion CJ8Y (spark plug), Stens 605-319 (air filter), Stens 610-009 (fuel filter) against the OEM number and dimensions.

Best for annual tune-up

Bundle spark plug, air filter, fuel filter when servicing the Echo CS-440 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 chain/bar combo

Match chain specs together, especially pitch, gauge, drive links, and bar mount details.

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

Does this fit CS-400? Parts may interchange with CS-400, but verify the serial range, OEM number, and physical part details before ordering.

Should I buy OEM or aftermarket parts for the Echo CS-440? 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 CS-440? 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.

What chain details matter besides bar length? Match pitch, gauge, and drive-link count against the bar stamp, old chain, and drive sprocket. Bar length alone is not enough.

Spark Plug

OEM90023YConfidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Dimensions: 0.6mm gap

Brand	Part #
Champion	CJ8Y	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
NGK	BPM8Y	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Air Filter

OEM13031038331Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Also fits CS-4400, CS-510, CS-520, CS-530

Brand	Part #
Stens	605-319	Best for annual tune-upAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Filter

OEMA369000100Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: In-tank pickup filter; fits most Echo chainsaws and trimmers

Brand	Part #
Stens	610-009	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Carburetor

OEM12300039330Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Walbro WT-416; 40.2cc engine. Variants WT-416-1 and WT-416C are also compatible.

Brand	Part #
Walbro	WT-416	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Recoil Starter

OEMA180001210Confidence: Low · Source: Aftermarket catalog

Reviewed: 2026-05-20

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

OEM12318139130Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20

Brand	Part #
Zama	BG-00-4	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Fuel Line Kit

OEM13200700760Confidence: Medium · Source: Aftermarket catalog

Reviewed: 2026-05-20
Variant notes: Includes fuel pickup line and return line

Brand	Part #
Stens	115-530	Best if replacing fuel systemAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Chain

OEMSpec-based fitmentConfidence: Low · Source: Inferred

Reviewed: 2026-05-20
Dimensions: 18", 3/8" LP pitch, .050" gauge, 62 drive links
Variant notes: Stock bar length; verify drive link count matches your bar

Brand	Part #
Oregon	91PX062G	Best chain/bar comboAmazonAffiliate link Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Guide Bar