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1. HI speed needle
2. IDLE speed adjustment
Screw
Maintenance and care
IMPORTANT
If the engine is adjusted for operation above 1,000 feet MSL,
the carburetor must be re-adjusted when operating the engine
below 1,000 feet MSL, otherwise severe engine damage can
result.
NOTE
Every unit is run at the factory and the carburetor is set in com-
pliance with Emission Regulations. This carburetor does not
have acceleration adjustment needles.
Before Adjustment
Check that:
Air filter is clean and properly installed.
Spark arrestor screen is free of carbon.
Blower pipes are installed.
1.
Before adjusting the carburetor, clean or replace the air filter
and spark arrestor screen and install blower pipes.
2.
Start engine and run for several minutes to reach operating
temperature.
3.
Stop engine. Turn red HI speed needle CCW (counter clock-
wise) to stop.
4.
Idle Speed Adjustment with tachometer.
ΠStart engine and turn "idle" speed adjustment screw to idle
RPM found "Specifications" on page 28 of this manual.
5.
Accelerate to full throttle for 2-3 seconds to clear excess fuel
from engine then return to idle. Accelerate to full throttle to
check for smooth transition from idle to full throttle. If engine
stops or stalls after full warm up, return the unit to your au-
thorized ECHO dealer for repair.
6.
Check HI speed RPM at W.O.T. (Wide Open Throttle). HI
speed RPM should be set to specifications found "Specifica-
tions" on page 28 of this manual.
7.
Check idle speed and reset if necessary.
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