Industry leading, lightweight professional petrol chain saw, ideal for felling. Fitted standard with 18" (45cm) guide bar^.



Where to buy

The lightest saw in its class, with enough power to breeze through any job. Part of the ECHO X Series meaning it has industry leading features and performance.

Professional engine

Professional engine

Featuring a powerful 50.2 cc profesional grade engine, giving exceptional power and performance.

Compact, ergonomic design

Compact, ergonomic design

The lightest saw in its class, the CS-501SX has many features appreciated by professionals. These include a starter grip assist cap opener; dropout prevention nuts; a tool-less air filter cover allowing easy air filter access, even when wearing gloves; a side access chain tensioner enabling easy chain adjustment; an anti-icing system preventing the carburettor from freezing in colder months

Starter grip assist caps

Starter grip assist caps

Starter grip can be used to open the caps manually.

Best Features


Engineered to weigh less whilst retaining robust durability.

Power to weight ratio

Super light-weight design with exceptional power.


Designed to maximise efficiency and comfort.

Product Details.

CO² (g/kW・h) 1 742
Sound power level (dB(A)) 113.5
Sound pressure level (dB(A)) 102.2
Vibration Front handle/Rear handle (m/s²) 5.2 / 5.4
Applicable Bar Length (cm/inch) 2 40, 45, 50 (33) / 16, 18, 20 (13)
Chain Brake Inertia
Chain Oil Tank Capacity 0.280
Chain Tensioner Side
Choke w/ Automatic Fast Idle Release Yes
Dry Weight (kg) 4.7
Engine displacement (cm³) 50.2
Fuel Consumption At Maximum Engine Power (L/h) 1.54
Fuel tank capacity (l) 0.50
Guide Bar Gauge (inch) 0.058, 0.050
Ignition System CDI
Output (kw) 2.57
Output (ps) 3.50
Saw Chain Pitch (inch) 0.325
Start Assist System Decomp
This CO² measurement results from testing a (parent) engine representative of the engine type (engine family) over a fixed test cycle under laboratory conditions and does not imply or express any guarantee of the performance of a particular engine.
Not all lengths available in every country. Available bar lengths may incur differing RRPs. Please check with your local dealer.

Other Features.

Fast Idle
G-FORCE Engine Air Pre-Cleaner
Model certified or CE
Side access chain tensioner

CS-501SX an Overview

Learn about the features the make the CS-501SX ECHO chainsaw so impressive and see it in action.