Echo SRM-350ES - Manual (Page 8)

SERVICE INFORMATION
SRM-330ES
SRM-350ES 8
2-3 Adjusting carburettor
1. Start engine and warm it up well for about 3 - 5 minutes with cycle of 50 seconds WOT (Wide Open
Throttle) and 10 seconds at idling.
2. Adjust idle mixture needle and obtain maximum idle speed with 2.5 mm blade screw driver.
3. Set idle speed to the range of 3,300 to 3,800 r/min by turning idle adjust screw.
4. Turn idle mixture needle anticlockwise to reduce idle speed 800 to 1,000 r/min to the final range of 2,300
to 3,300 r/min.
NOTE : Engine speed must be allowed to stabilize a minimum of 20 seconds after each adjustment to assure
accurate tachometer readings.
5. Check WOT engine speed. WOT engine speed should be more than 9,500 r/min.
6. After adjusting carburettor, insert and secure plug
(A) deep in the needle hole per directive. Spring pin
tool (3 mm) 897724-01261(B) is useful to insert the
plug.
7. Start engine again and make it sure engine runs
at idle speed of 2,200 to 3,400 r/min. Also make it
sure cutting device would not turn at engine idle
speed.
(A)
(B)