Echo SRM-420ES (L): SRM-420ES (U) Service Data

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

  • Page 1

    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...

  • Page 2

    Service information srm-420es 2 1 service information 1-1 specifi cations model srm-420es (l) srm-420es (u) dimentions* length mm (in) 1840 (72.4) width mm (in) 355 (14.0) 680 (26.8) heigh mm (in) 287 (11.3) 510 (20.1) dry weight* kg (lb) 8.3 (18.2) 8.8 (19.3) engine type yamabiko, air-cooled, two-s...

  • Page 3

    Service information srm-420es 3 1-2 technical data model srm-420es (l) srm-420es (u) engine idling speed r/min 2,800 +/- 400 wide open throttle speed r/min 9,500 - 10,500* 10,500 - 11,500** clutch engagement speed r/min 3,700 engagement limit † r/min less 3,300 or over 4,300 compression pressure mpa...

  • Page 4

    Service information srm-420es 4 1-3 torque limits descriptions size kgf•cm n•m in•lbf starter pawl m 8 60 - 90 6 - 9 50 - 80 system starter case m 5 30 - 45 3 - 4.5 26 - 40 ignition magneto rotor (flywheel) m 8 200 - 240 20 - 24 175 - 210 system ignition coil m 5 50 - 70 5 - 7 45 - 60 spark plug m 1...

  • Page 5

    Service information srm-420es 5 5k225 5k016 5k042 5k189 5k219 5k220 5k246 5k245 5k223 5k224 5k222 1-5 service limits a b c d e f g h k l m description mm (in) a cylinder bore when plating is worn and aluminum can be seen b piston outer diameter min. 39. 91 (1.571) c piston pin bore max. 10. 035 (0.3...

  • Page 6

    Service information srm-420es 6 1.5 1.65 1.3 0.4 a 0 0.4 50 0.8 1.2 1. Mpa 0 a b pet -304 1 7 4 3 2 b key part number description used for: 1 g310-000050 tachometer pet-304 measuring engine speed to adjust carburettor 2 x605-000050 torx l wrench removing and installing bolt 3 897501-03938 puller rem...

  • Page 7

    Service information srm-420es 7 2 carburettor adjustment procedure 2-1 general adjusting rules a. Before starting the unit for adjustment, check the following items. 1. The correct spark plug must be clean and properly gapped. 2. The air fi lter element must be clean and properly installed. 3. The m...

  • Page 8

    Service information srm-420es 8 2-3 adjusting carburettor srm-420es(l): remove shield and cut trimmer head line lengths to 190 mm. Srm-420es(u) : remove shield and blade, and cut trimmer head line lengths to 190 mm. 1. Start and warm engine for 3 minute alternating engine speed between wot for 50 se...