20
carburetor adjustment
Engine Break-In
New engines must be operated for a minimum duration of two tanks of fuel before carburetor adjustments can be made. During the
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting, emission, and durability performance up to 1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation and emission compliance above 1,100 feet ASL the carburetor may need to be adjusted by an authorized ECHO service dealer.
ImportantIf the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be
Level 2.
Tools required: Screwdriver, tachometer (Echo P/N 99051130017)
Parts required: None.
NOTE
Do not adjust carburetor unless necessary. If you have difficulty, see your ECHO dealer.
Adjustment ScrewsIdle Speed (A) Control throttle opening at idle.
Low (LO) Speed (B) Controls amount of fuel at low speed and supplementary fuel for smooth progression from idle to high speed.
High (HI) Speed (C) Controls amount of fuel at full throttle
Before AdjustmentCheck that:
•Air filter is clean and properly installed.
•Spark arrestor screen and muffler are free of carbon.
•Blower pipes are installed.
A
C
B