Echo CS-420ES Service Manual


Echo CS-420ES Service Workshop Manual for the Echo 420ES chainsaws. View free page images online or download PDF with images, diagrams and information. Print or save to any device.
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Echo CS-420ES Service Manual Repair

Echo CS-420ES Service Workshop Manual for the Repair and service of 420ES chainsaws. The PDF manual has diagrams and acurate information to help to troubleshoot, repair and fix the Echo chainsaw. View free page images online or download a PDF manual that you can easily save, print or view on most devices.

Echo CS-420ES Service Manual-Service Data


Specification, Technical data, Torque limits, Special repairing materials, Service limits., Special tools.


General adjusting rules, Presetting idle adjust screw, L mixture needle and H mixture needle, Adjusting carburetor.

See the additional carburetor manual, parts list, operator manual and technical supplements PDF download available on this website for more information on how to service and repair the chainsaw.

Echo CS-420ES Chainsaw Specifications

Echo CS-420ES chainsaw carbureter type: Walbro WT-980 with Large D-shaped mixture needles, OEM Part Number A021-001310.

Model: CS-420ES

External dimentions : L × W × H mm 393 × 243 × 277


Saw without guide bar and chain, empty tanks: kg 4.6


Fuel tank: mL 410

Tank for chain lubrication oil: mL 280

Fuel ( Mixture ratio ): Regular grade petrol. Minimum 89 Octane unleaded petrol is recommended. Do not use fuel containing methyl alcohol or more than 10 % of ethyl alcohol. 50 : 1 ( 2 % ) for ISO- L- EGD Standard ( ISO/CD 13738 ), JASO FC grade and ECHO Premium 50 : 1 oil.

Oil ( Chain oil ): Special chain oil or motor oil

Cutting length

All specified usable cutting lengths of guide bar: mm 380, 450


Specified pitch: mm 8.26 (0.325 inch)

Specified gauge ( thickness of drive links ): mm 1.47 (0.058 inch)

Type of guide bar: cm 38, 45 (ECHO)

Guide bar gauge: mm 1.47 (0.058 inch)

Type of chain: Carlton K2L, Oregon 21BPX

Lubrication: Adjustable automatic oil pump

Sprocket : Specified number of teeth 7

Chain speed at 1.33 times the maximum engine power speed: m/s 24.1


Type: Air cooled 2-cycle single cylinder

Carburettor: Diaphragm type-Walbro WT-980 with Large D-shaped mixture needles
Magneto: Flywheel magneto, CDI system
Spark plug: NGK BPMR8Y
Starter: Recoil starter ; “ES” START
Power transmission: Automatic centrifugal clutch

Engine displacement: mL (cm³) 40.2

Maximum shaft brake power ( ISO 7293 ): kW 1.6

Recommended maximum speed with cutting attachment: r/min 12500

Recommended speed at idling: r/min 2800 (2700 – 2900)

Sound pressure level

( EN 27182 ) LpAav = dB(A) 99.2

Guaranteed sound power level: ( 2000/14/EC ) LWA = dB(A) 110.0

Chain brake

Vibration : ( ISO 7505 ) m/s² 4.4 / 6.4

Front hand guard, Rear hand guard, Throttle trigger lockout, Chain catcher, Chain brake, Anti-vibration device, Spark arrester screen, Spiked bumper.

See manuals for more chainsaw specs..

Echo CS-420ES Service Workshop Manual PDF

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