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screw in (clockwise) until it just begins to
move the throttle lever; then continue
turning 2 full turns.
B. For Zama carburetors: Back the idle speed
screw (Fig. 30) out (counterclockwise)
until it does not contact the throttle valve
located inside of the carburetor. This is
accomplished by carefully watching for the
movement of the throttle lever to stop. Then
turn the screw in (clockwise) until it just
begins to move the throttle lever, then
continue turning 1 1/2 turns.
3.
Initial High Speed Mixture and Idle Speed
Mixture Needle Settings: Turn both the high
speed mixture and idle speed mixture needles
out (counterclockwise) until the limiter caps
stop.
POTENTIAL HAZARD
Engine must be running to make some
carburetor adjustments.
When engine is running, cutting head is
rotating and other parts are moving.
WHAT CAN HAPPEN
Contact with rotating cutting head or other
moving parts could cause serious personal
injury or death.
HOW TO AVOID THE HAZARD
Keep hands, feet and clothing away from
cutting head and other moving parts.
Keep all bystanders and pets away from
unit while making carburetor adjustments.
4.
Start the engine and let it run for a minute.
5.
Release the throttle trigger and let the engine
idle. If the engine stops, turn the idle speed
screw (Figs. 29 and 30) in (clockwise) 1/8 turn
at a time (as required) until the engine idles.
EN–13
Note:
Forcing the limiter caps with a
screwdriver will damage the needle
tips and the seat in the carburetor body.
6.
Final Idle Speed Screw and Idle Speed
Mixture Needle Settings: Adjust the idle speed
screw and idle speed mixture needle for
smoothest engine idle.
A. Turn the idle speed mixture needle (Figs. 29
and 30) in (clockwise) until you hear the
fastest idle; then turn the needle out
(counterclockwise) 1/8 turn.
B. Squeeze the throttle trigger. If the engine
falters or hesitates as it accelerates, turn the
idle speed mixture needle (Figs. 29 and 30)
out (counterclockwise) 1/16 turn at a time
until the engine accelerates rapidly.
C. If the idle speed changes significantly
because of Steps a and b, readjust the idle
speed screw (refer to Step 2).
Note:
The bump head line spool should not
rotate when the engine idles.
7.
Final High Speed Mixture Needle
Adjustment:
A. High speed mixture needle adjustment is
not recommended without a precision high
speed tachometer.
B. The factory presets the high speed mixture
needle at 1-1/4 turns out from the closed
position. Your unit should perform well at
this setting. If additional adjustment of the
high speed mixture needle is required,
contact your local authorized service dealer.
Note:
If the limiter caps are removed at any
time, your unit will no longer meet the
1995 California emission regulations
and you will void the warranty.
Note:
If the carburetor adjustments do not
help the unit to run properly, contact
your authorized service dealer.
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