Echo CS-4200ES - Manual (Page 8)

SERVICE INFORMATION
8 CS-3700ES
CS-4200ES
2-2 Presetting idle adjust screw, L mixture needle and H mixture needle (continued)
2. Screw threaded end of limiter cap tool 91019 with
2.5 mm left-hand thread into center hole of limiter
cap anticlockwise until tab of the limiter cap just
comes out of the locating slot.
NOTE : DO NOT COMPLETELY REMOVE LIMITER
CAP FROM CARBURETOR!
If the limiter cap was pulled out completely, there
is a chance that the other mixture needle would turn
and limiter cap tab would misalign with locating slot
when screwing the limiter cap removal tool into
center hole of the limiter cap. As a result, the thread
of the limiter cap would be stripped. Use 3 mm
diameter thread of wood screw to remove the
stripped limiter cap.
3. Remove the limiter cap removal tool from the
limiter cap by turning the tool clockwise, leaving the
limiter cap in place.
4. Screw threaded end of limiter cap removal tool
91019 into center hole of the other limiter cap
anticlockwise until the limiter cap is removed from
the mixture needle completely. Remove the limiter
cap from limiter cap removal tool turning clockwise,
and screw thread of limiter cap removal tool 91019
into center hole of previous limiter cap to pull out
completely.
5. Turn L and H mixture needles clockwise until
lightly seated, and then turn out both mixture needles
following turns.
L mixture needle : 1 1/4
H mixture needle : 3 (CS-3700ES:3600001 - 36008700)
3 1/2 (CS-3700ES:36008701 and after)
2 5/8 (CS-4200ES)
NOTE : If needles are forced during seating, damage
to carburetor may occur.
6. Remove air filter cover and air filter to see that
idle adjust screw contacts the throttle plate. Turn
idle adjust screw anticlockwise and set the screw
until the tip just contacts the throttle plate. Then turn
idle adjust screw 1 1/8 (CS-3700ES : Serial Number
36000001 - 36008700),1 3/4(CS-3700ES: Serial
Number 36008701 and after), 1 3/8(CS-4200ES)
turns clockwise. Reinstall air filter, and air filter cover.