Technical Data - Echo CS-2511TES Service Manual

CS-2511TES
251Ts, 251TCs

1-2 Technical data

Engine
Compression pressure
Clutch engagement speed
Engagement Minimum
Ignition system
Spark plug gap
Spark test
Tester gap w/ spark plug
Tester gap w/o spark plug
Pole shoe air gaps
Ignition timing
Carburettor
Test Pressure, minimum
Metering lever height
Tool to adjust mixture needles
Carburettor adjustment
1) Initial setting
H mixture needle
L mixture needle
Throttle adjust screw
Engine warm-up
2) Find idle maximum speed
3) Set idle maximum speed w/ TAS
4) Set idle speed
by turning L mixture needle ACW
5) Confirm H mixture needle position
before WOT setting *
6) WOT setting
7) Final WOT setting
Chain oil discharge volume
BTDC: Before top dead centre.
†
If clutch engagement speed is lower than minimum clutch engagement speed, replace clutch assembly with
new one.
1
* Set Throttle adjust screw to the point that its tip just contacts throttle plate before initial setting.
2
* If clutch engages during adjustment process 2), decrease engine speed by turning TAS ACW until clutch
disengages and then redo 2).
3
* With 25 cm guide bar and properly tensioned saw chain.
SERVICE INFORMATION
2
MPa (kgf/cm
†
mm(in)
mm(in)
mm(in)
mm(in)
at 1,000 r/min °BTDC
at 3,000 r/min °BTDC
at 10,000 r/min °BTDC
2
MPa (kgf/cm
mm(in)
turn out
turn out
turn in*
Idle - WOT : Total
3
mL/min(UK.fl.oz./min)
WOT: Wide open throttle
) (psi) 1.03 (10.5) (150)
r/min
r/min
0.6 - 0.7 (0.024 - 0.028)
0.3 - 0.4 (0.012 - 0.016)
) (psi)
1.65 (0.06) lower than diaphragm seat
Screwdriver 2.5 mm P/N X603-000050
D-shaped tool (L) P/N X645-000031
(Carb. adjustment tool P/N Y089-000094)
1
sec.
Adjust L mixture needle to maximum idle speed*
r/min
r/min 3,200 (2,800 - 3,600)
Turn H mixture needle ACW to confirm engine
speed decreses less than 12,000 r/min
Turn H mixture needle CW and set engine speed
within 12,400 - 12,600 r/min
Turn H mixture needle CW by : 1/4
within 1 2,700 - 13,400 r/min
Adjustable: 1.5 - 13 (0.05 - 0.46)
(Factory set: 7 mL/min)
ACW: Anticlockwise
4,400
3,900
4.0 (0.16)
6.0 (0.24)
9
12
29
0.05 (0.5) (7.0)
2 5/8
1 7/8
1 5/8
5 - 5 : 100
4,000
TAS: Throttle adjust screw
3
2