Echo PB-251 Service Manual

SERVICE INFORMATIONPB-251
5
1-5 Service limits
Description mm (in)
A Cylinder bore When plating is worn and aluminum can be seen
B Piston outer diameter Min. 33.91 (1.335)
C Piston pin bore Max. 8.030 (0.3161)
D Piston ring groove Max. 1.3 (0.051)
E Piston ring side clearance Max. 0.1 (0.004)
F Piston pin outer diameter Min. 7.980 (0.3142)
G Piston ring width Min. 1.15 (0.045)
H Piston ring end gap Max. 0.5 (0.02)
K Con-rod small end bore Max. 11.988 (0.4719)
L Crankshaft runout Max. 0.05 (0.002)
5K016
5K263 5K264 5K265
5K266
5K204
5K017
5K219
5K171
5K267
ABCD
EFGH
KL

Echo PB-251 Specifications

General

Engine Displacement	25.4 cc
Air Speed	170 mph
Noise Level	70 dB(A)
Type	Handheld
Power Source	Gasoline
Fuel Capacity	16.9 fl oz