Ryobi 700r Operator's Manual page 15

the carburetor. The resulting symptoms are often
mistaken for an out-of-adjustment carburetor.
Therefore, check the condition of the air filter
before adjusting the carburetor. Refer to Air
Rlter Maintenance.
Walbre Carburetor Throttle
Idle Speed
Needle
Fig, 25
ZamaCarburetor Throttle
Lever
Idle S
Mixture
Needle Needle
Fig. 26
If the following conditions are expertenced,it may
be necessary to adjustthe carburetor:
• The engine wi!l not idle
• The engine hesitstes or staUs on acceleration
• A loss of engine power that is not corrected
by cleaning the air filler and muffler
NOTE: Careless adjustments can sedousiy
damage your unit. tt is recommended
that carburetor adjustments are made by
an authodzed service dealer.
Adjusting Carburetor
1. Clean the air filtar if it is dirty. Refer to Air Rlter
Maintenance.
2. Make the initial settingswith the engine
stopped. These initial settingsshouldallowyou
to start and warm up the unit before making
the final adjustments.
Initial Idle Speed Setting
a. For Waibrocarburetors:Back the idle speed
screw (Fig.25) out, counterclockwise, untilit
does not contact the carburetorthrottlelever.
Then turn the screw in, clockwise, until it
just begins to move the throttlelever; then
continue turning 2 full toms,
b, For Zama carburetors: Back the idle speed
screw (Fig. 26) out, counterclockwise, until it
does not contact the throftle lever. Then turn
the screw in, clockwise, until it just begins
to move the throttle]ever,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, counted'clockwise, untilthe limller caps
stop.
4. Start the engine and let it run for a minute.
5. Release the throttletdgger and let the engine
idle. If the engine stops,turn the Idle speed
screw (Rgs. 25 and 26) in, clockwise, 1/8 turn
at a time (as required) until the engineidles.
NOTE: Foming the limlter caps with a screwdriver
will damage the needle tips arv:lthe seat in
the carburetor body.
6. Final Idle Speed So'ew and Idle Speed
Mixture Needle Setting= Adjust the idle
speed screw and idle speed mixture needle
for smoothest engine idle.
a. *rumthe idle speed mixture needle (Figs.
25 and 26) in, clockwise, untilyou hear the
fastestidle; then turn the needle out,
couot;erclockwise, 1/8 turn.
b. Squeeze the throttle tdgger. If the engine
falters or hesitates as it accelerates,
turn the idle speed mixture needle 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 hsed/Iise spool should not
rotate when the engine idles.
Final High Speed Mixture Needle Adjusfmtent
1. High speed mixture needle adjustment is not
recommended without a precision high speed
tachometer.
2. The factory presets the high speed mixture
needle st 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.
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