Echo PB-251 Service Manual

SERVICE INFORMATION PB-251
4
1-3 Torque limits
Descriptions Size kgf•cm 2N•m in•lbf
Starter Starter pawl M 8* 130 - 150 13 - 15 115 - 130
system
Starter case M 5 40 - 55 4.0 - 5.5 35 - 50
Ignition Ignition coil M 4 35 - 45 3.5 - 4.5 30 - 40
system
Spark plug M 14 150 - 170 15 - 17 130 - 150
Fuel Carburetor insulator M 5 50 - 70 5 - 7 45 - 60
system
Carburetor M 5 35 - 45 3.5 - 4.5 30 - 40
Engine Crankcase M 5 70 - 110 7 - 11 60 - 95
Cylinder M 5 70 - 110 7 - 11 60 - 95
Cylinder cover M 5 60 - 80 6 - 8 50 - 70
Cylinder cover with lead M 5 40 - 60 4 - 6 35 - 50
Engine mount M 4* 30 - 45 3 - 4.5 25 - 40
Muffler M 5 70 - 80 7 - 8 60 - 70
Muffler cover M 5* 30 - 45 3 - 4.5 25 - 40
Others Outer fancase M 5
†
20 - 40 2 - 4 17 - 35
Fan M 8 140 - 160 14 - 16 120 - 140
Fan hub M 8* 160 - 200 16 - 20 140 - 175
Regular bolt, nut, M 3 6 - 10 0.6 - 1.0 5 - 9
and screw
M 4 15 - 25 1.5 - 2.5 13 - 22
M 5 25 - 45 2.5 - 4.5 22 - 40
M 6 45 - 75 4.5 - 7.5 40 - 65
M 8 110 - 150 11 - 15 95 - 130
1-4 Special repairing materials
Material Location Remarks
Thread locking sealant Engine mount
Loctite # 242, ThreeBond 1324 or equivalent
Fun hub
Starter pawl
Loctite # 222, ThreeBond 1342 or equivalent
Muffler cover
Grease Rewind spring
Lithium based grease or ECHO LUBE
TM
Starter center shaft
* Apply thread locking sealant (See below)
** The torque differences among four bolts should not exceed 20 kgf•cm (2N•m, 17in•lbf) on one cylinder or crankcase.
†
Tapping screw

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