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18
CARBURETOR ADJUSTMENT
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments can be made. During the break-in
period your engine performance will increase and exhaust emissions will
stabilize. Idle speed can be adjusted as required.
High Altitude Adjustment
High altitude adjustment is not required for proper operation of this
engine.
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 Screws
Idle Speed (A)
Low (LO) Speed (B)
High (HI) Speed (C)
Before Adjustment
Check that:
• Air filter is clean and properly installed.
• Spark arrestor screen and muffler are free of carbon.
• Nylon line head with lines trimmed to 8 in. is installed.
Initial Adjustment
1. With engine off, turn HI speed screw (C) counterclockwise to stop.
2. Turn LO speed screw (B) midway between stops.
3. Turn idle screw (A) until tip of screw just touches throttle plate; then
turn three (3) turns clockwise.
Controls throttle opening at idle.
Controls amount of fuel at low speed and
supplementary fuel for smooth progression from
idle to high speed.
Controls amount of fuel at full throttle
B
C
A
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