Carburettor Adjustment - Hitachi CM14E Operator's Manual

Carburettor Adjustment

H: High speed needle
GB
Idle speed
adjustment knob
L: Low speed needle
22
Every unit is run at the factory and the carburettor
is set in compliance with Emission Regulations.
In addition, the carburettor is equipped with "H"
(High Speed Needle) and "L" (Low Speed Needle)
needle adjustment limiters that prevent settings
outside acceptable limits.
1. Before adjusting carburettor clean or replace air
fi lter and muffl er.
2. Start engine and run several minutes to bring to
operating temperature. Flash choke twice during
warm-up to clear any air from the fuel system.
3. Stop engine.
Turn "H" speed needle anticlockwise to stop.
Turn "L" speed needle midway between full
clockwise stop and anticlockwise stop.
4. Idle Speed Adjustment:
• Start engine, turn "Idle" speed adjustment knob
clockwise until the wheel begins to turn, then
turn knob out anticlockwise until the wheel
stops turning. Turn knob out, anticlockwise, an
additional 1/4 turn.
WARNING
Cutting attachment must not turn or move
when unit is idling.
5. Accelerate to full throttle for 2 - 3 seconds to
clear any excess fuel in the engine, then return
to idle.
Accelerate engine to full throttle to check for
smooth transition from idle to high speed.
If engine hesitates turn "L" needle anticlockwise
1/8 turn and repeat acceleration. Continue
adjustment until smooth acceleration results.
6. Check idle speed and reset if necessary as
described in item 4. If a tachometer is available
idle speed should be set as specifi ed in the
Operator's Manual.
CAUTION
When starting, idling adjustment speed
should be adjusted not to rotate the wheel.
Correct idle speed is adjusted 2600 to 2800 r/
min. Or 1/4 turn anticlockwise from the point
the wheel stops moving.
When there is some trouble with the
carburettor, refer to your distributor or
dealer.