Echo SRM-420ES (L): SRM-420ES (U) User Manual

SRM-420ES
10-42A-00
1
INTRODUCTION
We are constantly working on technical im-
provement of our products. For this reason,
technical data, equipment and design are
subject to change without notice. All speci-
fications and directions in this SERVICE
DATA are based on the latest product infor-
mation available at the time of publication.
1
SERVICE DATA
TRIMMER/BRUSHCUTTER
ECHO:
SRM-420ES
STAGE MODEL
(Serial number : 37000001 and after)
CONTENTS
page
1 SERVICE INFORMATION
.............................. 2
1-1 Specifi cation ............................................... 2
1-2 Technical data ............................................. 3
1-3 Torque limits................................................ 4
1-4 Special repairing materials ......................... 4
1-5 Service limits............................................... 5
1-6 Special tools ............................................... 6
2 CARBURETTOR ADJUSTMENT PROCEDURE
.. 7
2-1 General adjusting rules ............................... 7
2-2 Presetting Idle adjust screw, L mixture
needle
and H mixture needle
.......................................... 7
2-3 Adjusting carburettor................................... 8
Reference No.
10-42A-00
ISSUED: 201204

Echo SRM-420ES (L): SRM-420ES (U) Specifications

General

Engine Type	2-stroke
Displacement	41.5 cc
Start System	ES-Start
Shaft Type	Straight
Ignition System	Digital
Cutting Width/Swath	430 mm
Cutting Attachment	Nylon head
Warranty	2 years

Summary

Service Information

Specifications

Lists model dimensions, weight, engine type, displacement, bore, stroke, and fuel capacity.

Technical Data

Details engine speeds, ignition timing, compression, carburettor specs, and measurements.

Torque Limits

Provides specific torque values for various engine and component fasteners in N·m and in-lbf.

Special Repairing Materials

Lists required grease, oil, and thread locking sealant for maintenance and repairs.

Service Limits

Defines maximum wear limits for critical engine components like cylinder bore and piston.

Special Tools

Identifies specific tools required for maintenance, testing, and adjustments.

Carburettor Adjustment Procedure

General Adjusting Rules

Outlines essential pre-adjustment checks for spark plug, air filter, fuel, and engine loading.

Presetting Idle Adjust Screw and Mixture Needles

Describes initial settings for idle adjust screw, L and H mixture needles before final tuning.

Adjusting Carburettor

Details the step-by-step process for fine-tuning engine idle and WOT speeds for optimal performance.