WhichPartFits.com

Chainsaw

Echo CS-400

2-Stroke

The Echo CS-400 is a 40.2cc 2-stroke chainsaw and one of Echo's most popular homeowner/prosumer models, capable of handling 16" to 18" guide bars for regular firewood and moderate felling. It runs a Zama C1M carburetor and features a large-capacity air filtration system. Known for reliable cold starting and ease of routine maintenance. Common service items are the spark plug (Champion CJ8Y), air filter, fuel filter, and primer bulb. Echo's G-Force Engine Air Pre-Cleaner system extends air filter service intervals compared to conventional filtration designs.

See also: CS-440 — parts are often interchangeable within this family.

Spark Plug

OEM90023Y(0.6mm gap)

Air Filter

OEMA226000860
BrandPart #
Stens605-400Buy on Amazon →

Fuel Filter

OEMA369000100In-tank pickup filter; fits most Echo chainsaws and trimmers
BrandPart #
Stens610-009Buy on Amazon →

Carburetor

OEM12520005570Zama C1M-K47B; 40.2cc engine

Recoil Starter

OEMA180001210
BrandPart #

Primer Bulb

OEM12318139130

Fuel Line Kit

OEM13200700760Includes fuel pickup line and return line
BrandPart #
Stens115-530Buy on Amazon →

Chain

OEM(18", 3/8" LP pitch, .050" gauge, 62 drive links)Stock bar length; verify drive link count matches your bar
BrandPart #
Oregon91PX062GBuy on Amazon →

Guide Bar

OEM(18", 3/8" LP pitch, .050" gauge)