Lightweight and powerful, rear handle petrol chain saw. Offering a superior power to weight ratio.

Where to buy

The CS-421 is packed full of professional features engineered to increase your productivity. ES-Start provides effortless starting in all conditions, a side access chain tensioner and an automotive style air filter that keeps your machine free from dust and debris. Weighing in at just 4.6kg with a powerful 40.2cm³ ECHO engine, it is ideal for small to medium sized professional jobs.

Professional engine

Professional engine

Featuring a powerful 40.2cm³ professional grade engine, giving exceptional power and performance.

Compact, ergonomic design

Compact, ergonomic design

ECHO chain saws are all designed to the same professional standard, with no exceptions. Hard working, high quality with renowned Japanese build standards.



Superbly balanced and lightweight making it an ideal saw for a range of different ground jobs.

Best Features.


Engineered to weigh less whilst retaining robust durability.


Designed to maximise efficiency and comfort.

Easy start engine

ECHO’s patented system for effortless starting.

Product Details.

Engine displacement (cm³) 40.2
Output (kw) 1.82
Output (ps) 2.47
Dry Weight (kg) 4.6
Fuel tank capacity (l) 0.41
Chain Oil Tank Capacity (ml) 0
Fuel Consumption At Maximum Engine Power (L/h) 1.03
Priming Pump Yes
Ignition System CDI
Start Assist System ES-start
Chain Brake Inertia
Choke w/ Automatic Fast Idle Release Yes
Chain Tensioner Side
Saw Chain Pitch (inch) 0.325
Guide Bar Gauge (inch) 0.050
Applicable Bar Length (cm/inch) 1 38, 43, 45 / 15, 17, 18
Sound pressure level (dB(A)) 99.9
Not all lengths available in every country. Available bar lengths may incur differing RRPs. Please check with your local dealer.