Echo CS-2511WES Service Manual page 6

4
1-2 Technical data (continued)
Carburetor adjustment
Fuel type
1) Initial setting
1
* Set Throttle adjust screw to the point that its tip just contacts throttle plate before initial setting.
IMPORTANT: Use Tachometer PET-1000R to measure engine speed (Refer to 1-6 Special tools).
IMPORTANT: The PI controller installed model has 2 mode; Carburetor adjustment mode and Operation
mode. When adjusting carburetor, must be changed from Operation mode to Carburetor adjustment mode.
The mode will return to the Operation mode when the engine is stopped.
To change the mode,
1. Start engine without brake activated. (Do not touch throttle lever.)
2. Engine warm-up with fast idle for 120 seconds. (The speed should be within 6,000 - 10,000 r/min. If it
is not, adjust the speed by turning H mixture needle.)
CAUTION: Chain will start to rotate during engine warm-up with fast idle.
NOTE: Do not stop engine during carburetor adjustment. If the engine is stopped, restart this procedure from
the beginning.
The carburetor adjustment continues.
Engine warm-up
2) Confirm that the mode has changed
3) Find idle maximum speed
4) Set idle maximum speed w/ TAS
5) Set idle speed by turning L mixture needle CCW r/min
6) Verify final engine speed with standard equipment
7) Verify clutch engagement speed
WOT: Wide open throttle CCW: Counterclockwise TAS: Throttle adjust screw
2
* If clutch engages during adjustment process 2), decrease engine speed by turning TAS CCW until clutch
disengages and then redo 2).
SERVICE INFORMATION
H mixture needle turn out
L mixture needle turn out
Throttle adjust screw turn in*
Idle - WOT : Total
Mixed two-stroke Mixed two-stroke
regular fuel
1 3/4
1
sec.
Confirm to vary the idle engine speed by turning L
mixture needle 1/4 turn CW. If the speed does not
vary, change the mode again.
(The idle engine speed returns to 3,200 r/min for a
few seconds in Operation mode, when the engine
speed is deviated.)
Adjust L mixture needle to maximum idle speed*
r/min
Idle: 3,100 - 3,300
r/min WOT: 12,800 - 13,400
If the WOT speed is not within above range,
readjust H mixture needle and reverify the speed.
If that does not work, adjust H mixture needle by
1/8 turn and reverify the speed.
Confirm clutch engagement speed.
If it is less than 1.25 times the idle speed,
adjust the idle speed by turning TAS CCW.
CS-2511WES
251Ws
Premixed
E10 fuel alkylate fuel
2 2 1/4
2 1/2
1 1/2
5 - 5 : 30
4,100
3,300
2