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


With features like ES-start for effortless starting and a side access chain tensioner, the CS-421ES is built to get the job done with ease.

Professional engine

Professional engine

Featuring a powerful 40.2 cc profesional 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 arborist saw for arboricultural off-ground work.

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.

dry weight (kg) 4.6
Chain Oil Tank Capacity (L) 0.28
engine displacement (cm3) 40.2
Fuel Consumption At Maximum Engine Power (L/h) 1.03
output (ps) 2.47
output (kw) 1.82
fuel tank capacity (l) 0.41
Saw Chain Pitch (inch) 0.325