SERVICE INFORMATION
CS-2511TES
251Ts, 251TCs
3
1-2 Technical data
Engine
Compression pressure MPa (kgf/cm
2
) (psi) 1.03 (10.5) (150)
Clutch engagement speed r/min 4,400
Engagement Minimum
†
r/min 3,900
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Spark test
Tester gap w/ spark plug mm(in) 4.0 (0.16)
Tester gap w/o spark plug mm(in) 6.0 (0.24)
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1,000 r/min °BTDC
9
at 3,000 r/min °BTDC 12
at 10,000 r/min °BTDC 29
Carburettor
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.65 (0.06) lower than diaphragm seat
Tool to adjust mixture needles
Screwdriver 2.5 mm P/N X603-000050
D-shaped tool (L) P/N X645-000031
(Carb. adjustment tool P/N Y089-000094)
Carburettor adjustment
1) Initial setting
H mixture needle turn out
2 5/8
L mixture needle turn out 1 7/8
Throttle adjust screw turn in*
1
1 5/8
Engine warm-up Idle - WOT : Total sec. 5 - 5 : 100
2) Find idle maximum speed Adjust L mixture needle to maximum idle speed*
2
3) Set idle maximum speed w/ TAS r/min 4,000
4) Set idle speed
by turning L mixture needle ACW
r/min 3,200 (2,800 - 3,600)
5) Conrm H mixture needle position
before WOT setting
*
3
Turn H mixture needle ACW to conrm engine
speed decreses less than 12,000 r/min
6) WOT setting
Turn H mixture needle CW and set engine speed
within 12,400 - 12,600 r/min
7) Final WOT setting
Turn H mixture needle CW by : 1/4
within 1
2,700 - 13,400
r/min
Chain oil discharge volume
Adjustable: 1.5 - 13 (0.05 - 0.46)
(Factory set: 7 mL/min)
mL/min(UK..oz./min)
BTDC: Before top dead centre. WOT: Wide open throttle ACW: Anticlockwise TAS: Throttle adjust screw
†
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.
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