Echo CS-420ES

SERVICE INFORMATION
CS-370ES
CS-420ES
4
1-3 Torque limits
Descriptions Size kgf•cm N•m in•lbf
Starter Starter pawl M5 40 - 60 4 - 6 35 - 50
system
Starter case M5** 25 - 35 2.5 - 3.5 22 - 30
Ignition Magneto rotor (Flywheel) M8 250 - 290 25 - 29 220 - 250
system
Ignition coil M5 40 - 60 4 - 6 35 - 50
Ignition switch M14 15 - 30 1.5 - 3 13 - 26
Spark plug M14 150 - 170 15 - 17 130 - 150
Fuel Carburetor M5 30 - 45 3 - 4.5 26 - 40
system
carburetor elbow M5** 20 - 30 2 - 3 17 - 26
Intake bellows M5 30 - 45 3.0 - 4.5 26 - 40
Clutch Clutch hub LM10 300 - 400 30 - 40 260 - 350
Engine Crankcase*** M5* 70 - 110 7 - 11 60 - 95
Engine mount M5 70 - 110 7 - 11 60 - 95
Muffler M5 80 - 110 8 - 11 70 - 95
Cylinder cover M5 25 - 45 2.5 - 4.5 22 - 40
Others Auto-oiler M4 20 - 35 2.5 - 3.5 17 - 30
Front handle M5** 45 - 65 4.5 - 6.5 40 - 55
Rear handle assembly
M5 30 - 50 3 - 5 26 - 45
M4 35 - 50 3.5 - 5 30 - 45
Handle lid M4 10 - 20 1 - 2 9 - 17
Brake lever (Hand guard)
M5** 10 - 20 1 - 2 9 - 17
M4** 45 - 65 4.5 - 6.5 40 - 55
Sprocket guard plate M4** 10 - 20 1 - 2 9 - 17
Chain catcher M5 45 - 60 4.5 - 6 40 - 52
Guide bar M8 200 - 230 20 - 23 175 - 200
Regular bolt, nut, M3 6 - 10 0.6 - 1 5 - 9
and screw
M4 15 - 25 1.5 - 2.5 13 - 22
M5 25 - 45 2.5 - 4.5 22 - 40
M6 45 - 75 4.5 - 7.5 40 - 65
1-4 Special repairing materials
Material Location Remarks
Adhesive Ball bearing outer / crankcase
Pulse pipe joint
Loctite #675 or equivalent
Cushions Loctite #424, ThreeBond #1741 or equivalent
Liquid gasket Crankcase seams Loctite #515 or equivalent
Grease Auto-oiler worm
Clutch needle bearing
Handle cushions Lithium based grease
Rewind spring
Starter center shaft
Chain brake (metal contact part) Molybdenum grease (approx. 1 gram)
LM: Left-hand thread *Apply thread locking sealant (See below) ** Tapping screw
*** The torque differences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on crankcase