Echo shindaiwa CS-501SX, Руководство по обслуживанию

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FUEL SYSTEM
CS-501SX, CS-501SXH
501sx
29
4-6-3 Adjusting carburetor
1. Start and warm engine for 100 seconds al-
ternating engine speed between WOT and idle
every 5 seconds. Turn H mixture needle (C) coun-
terclockwise until engine speed drops to approx.
12,500 r/min at WOT.
NOTE : Do not run engine at high speed without
load longer than 10 seconds, or engine damage
may occur.
2. Adjust L mixture needle (B) using Carbure-
tor adjustment tool (A) to reach maximum engine
speed just before lean drop off.
I f c h a i n s t a r t s t o r o t a t e d u r i n g a d j u s t m e n t ,
decrease engine speed by turning throttle adjust
screw (D) counterclockwise untill chain stops and
then readjust L mixture needle (B).
3. Set idle speed to 3,500 r/min by turning Throttle adjust screw (D). Engine speed should be stable at 3,500
+/- 50 r/min after Throttle adjust screw adjustment.
4. Turn L mixture needle (B) counterclockwise reducing engine idle speed 800 r/min to set idle speed at
2,700 r/min. The engine idle speed ranges is 2,600 - 2,800 r/min.
NOTE : Engine speed must be allowed to stabilize a minimum of 20 seconds after each adjustment of L
mixture needle to assure accurate tachometer readings.
5. Before adjustment, WOT engine speed should be 12,500 r/min or less. If engine speed is higher, turn
H mixture needle (C) counterclockwise until 12,500 r/min is achieved. To make the fi nal WOT engine
speed adjustment, turn H mixture needle (C) clockwise in 1/8 turn increments with the engine at idle, then
squeeze throttle trigger and check WOT engine speed. The fi nal WOT engine speed should fall within
13,000 - 13,800 r/min.
6. Start engine, and verify engine idle speed ranges from 2,300 to 3,100 r/min, and WOT engine speed
ranges from 13,000 to 13,800 r/min. Make sure the chain does not rotate when engine is idling. When
fi nal adjustment is completed, the engine should idle, accelerate smoothly, and attain WOT per above
specifi cations.
NOTE : WOT and idle engine speed in fi eld operation may vary from fi nal adjustment specifi cations due
to changing ambient conditions and fuel. Engine speed variances should be within the safe ranges for
WOT and idle engine speed as listed in Section 1-2 Technical data, otherwise the carburetor should be
readjusted.
(C)
(D)
(B)