Echo CS-350WES - Page 39

CS-350WES
37
FUEL SYSTEM
4-15-2 Adjusting carburetor
1. Start engine and warm it up well for 2-3 minutes
with cycle of 5 seconds at WOT (Wide Open Throttle)
and 10 seconds at idling.
2. Turn L mixture needle clockwise at idle speed
slowly until engine speed drops. Turn L mixture
needle counterclockwise to obtain maximum idle
speed using 2.5 mm wide blade screw driver.
3. Set idle speed to 4,000 r/min by turning idle adjust
screw.
4. Turn L mixture needle counterclockwise to reduce
engine idle speed 800 r/min to set idle speed at
3,200 r/min the idle speed is allowed in the range of
3,000 to 3,400 r/min.
5. Turn H mixture needle counterclockwise at WOT
until engine speed drops less than 12,000 r/min.
Then turn H mixture needle clockwise to obtain
12,800 to 13,200 r/min at WOT.
6. If the engine speed at WOT is above 13,500
r/min, adjust H mixture needle counterclockwise and
set maximum engine speed at less the 13,500
r/min.
NOTE: Do not run engine at high speed without load
longer than 5 seconds, or engine damage may
occur.
7. After adjusting carburetor, put limiter cap on tip of
limiter cap tool : 91019 and install the caps on L and
H mixture needles as shown.
NOTE: Align the limiter cap’s tabs (A) with locating
slots (B) in extended housing of carburetor.
IMPORTANT: The limiter cap must be installed L
and H mixture needles to comply with Emission
Directive.
8. Start engine again and make it sure engine runs
at idle speed in the range of 2,900 to 3,500 r/min
and at WOT speed in the range of 12,500 to 13,500
r/min. If idle speed is not the range, adjust idle screw
to meet with the range. Also make it sure chain would
not turn at engine idle speed and suitable
acceleration.
NOTE: Initial carburetor setting (Idle adjust screw,
L and H mixture needles) shown here is to start the
engine after restoration or carburetor change. Idle
adjust screw, L and H needles turn for designated
engine revolution through procedures indicated here
may vary. As long as idle and WOT engine speed is
set in given range, variance would be ignorable.
L
H
T
H
L
(A)
(B)
(B)
(A)
idle adjust screw