Echo CS-420ES Service Manual

SERVICE INFORMATION
CS-370ES
CS-420ES
5
Description mm (in)
CS-370ES CS-420ES
A Cylinder bore When plating is worn and aluminum can be seen
B Piston outer diameter Min. 37.91 (1.493) 39.89 (1.570)
C Piston pin bore Max. 9.075 (0.3573) 9.030 (0.3555)
D Piston ring groove Max. 1.6 (0.063)
E Piston ring side clearance Max. 0.1 (0.004)
F Piston pin outer diameter Min. 8.98 (0.3535)
G Piston ring width Min. 1.45 (0.057)
H Piston ring end gap Max. 0.5 (0.02)
K Con-rod small end bore Max. 12.025 (0.4734)
L Crankshaft runout Max. 0.05 (0.002)
M Sprocket bore Max. 13.07 (0.5146)
N Clutch drum bore Max. 71.5 (2.81)
P Sprocket wear limit Max. 0.5 (0.02)
1-5 Service Limits
5K173
5K280
5K174 5K190
5K016 5K042
5K277 5K278
5K191
5K279
1
2
3
4
5K275
5K276
ABCD
FGH
KLMP
N
E

Echo CS-420ES Specifications

General

Saw Chain Gauge	0.050 inches
Fuel Capacity	0.41 liters
Weight	4.6 kg
Saw Chain Pitch	3/8 inches
Bar Length	16 inches