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SRM-420ES

10-42A-00

1

INTRODUCTION

W

e 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 Speci

fi

 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

I S S U E D :     2 0 1 2 0 4

Summary of Contents for SRM-420ES (L): SRM-420ES (U)

Page 1: ...he 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 Specification 2 1 2 Technical data 3 1 3...

Page 2: ...x 35 9 Fuel Type Premixed two stroke fuel Mixture ratio 50 1 2 Petrol Minimum 89 octane Two stroke engine oil ISO L EGD ISO CD13738 JASO FC FD Tank capacity L U S fl oz 0 68 23 0 Clutch Type Centrifug...

Page 3: ...mm in 0 3 0 4 0 012 0 016 Ignition timing at 3 000 r min BTDC 12 at 8 000 r min BTDC 25 at 10 000 r min BTDC 23 Carburettor Venturi Size 12 7 0 50 Throttle Bore 14 3 0 56 Idle adjust screw initial se...

Page 4: ...over M 5 20 30 2 3 17 26 Stand M 5 20 30 2 3 17 26 Muffler M 6 100 140 10 14 90 125 Muffler cover M 5 30 45 3 4 5 26 40 Muffler stay M 5 60 90 6 9 50 80 Others Blade fastening nut LM 10 280 320 28 32...

Page 5: ...luminum can be seen B Piston outer diameter Min 39 91 1 571 C Piston pin bore Max 10 035 0 3951 D Piston ring groove Max 1 6 0 063 E Piston ring side clearance Max 0 1 0 004 F Piston pin outer diamete...

Page 6: ...h Removing and installing pawl carrier 13 897714 12330 Oil seal tool Installing crankcase oil seal clutch side 14 897714 24330 Oil seal tool Installing crankcase oil seal starter side PTO shaft bearin...

Page 7: ...2 800 100 r min by turning Idle adjust screw Confirm WOT engine speed approx 10 000 r min If engine does not run correctly after this adjustment proceed to the next step 2 2 2 2 Presetting Idle adjus...

Page 8: ...eter readings 6 Adjust H mixture needle C to reach maximum WOT engine speed Then turn H mixture needle C anticlockwise to reduce WOT engine speed 120 r min RANG 100 140 r min max approx 9 000 r min NO...

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