Echo CS-5100 - Manual (Page 9)

SERVICE INFORMATION
CS-4400
CS-5100 9
2 EMISSION ADJUSTMENT GUIDE
CS-4400
2-1 General adjusting rules
Before starting the unit for adjustment, check the following items.
1. The correct spark plug must be clean and properly gapped.
2. The air filter element must be clean and properly installed.
3. The muffler exhaust port must be clear of carbon.
4. The fuel lines, tank vent and fuel filter are in good condition and clear of debris.
5. The fuel is fresh ( > 89 octane : RON) and properly mixed at 50 : 1 with “ISO L-EGD” 2-stroke oil.
6. The recommended bar and chain must be installed to the power head, and properly tensioned.
NOTE : Make sure of proper installation of 45 cm guide bar and saw chain when adjusting carburettor, or
serious engine damage may occur due to overspeeding.
2-2 Presetting idle adjust screw, L mixture needle and H mixture needle
1. Tu r n t h e L a n d H m i x t u r e n e e d l e s o u t
anticlockwise to rich side stop, and meet limiter caps
tabs (A) with locating slots (B).
2. Screw 2.5 mm wood screw in the center of the L
limiter cap.
NOTE : Screw the wood screw in until it lightly
contacts L mixture needle in the cap.
3. Pull the wood screw with limiter cap using pliers.
4. Repeat Step 2 and Step 3 for H limiter cap by
hand.
5. Turn L and H mixture needle clockwise until lightly
seated, and then turn out both needles following
turns.
L mixture needles : 1 1/4
H mixture needles : 3
NOTE : If needles are forced during seating, damage
to carburettor may occur.
6. Turn idle adjust screw anticlockwise and set the
screw until the tip to just contact throttle plate. Then
turn idle adjust screw 1 1/2 turns clockwise.
H
L
(A)
(B)
(B)
(A)
idle adjust screw