Echo SRM-350ES - Manual (Page 7)

SERVICE INFORMATION
SRM-330ES
SRM-350ES 7
2 EMISSION ADJUSTMENT GUIDE
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. Two line nylon line head with properly cut lines must be installed for proper engine loading.
2-2 Presetting idle adjust screw and idle mixture needle
1. Remove the plug from idle mixture needle hole
using M2.5 tap (A) as shown.
NOTE : When plug is damaged and left in the hole,
use needle or pin-shaped object to scrape.
2. Turn idle adjust screw (B) anticlockwise until its
tip just touches throttle plate (C). Then turn it in
clockwise 4 1/2 turns.
3. Turn idle mixture needle (D) anticlockwise to fully
come out until clicking sound is heard. Then turn it
clockwise 14 turns.
(A)
(B)
(C)
(D)