Ryobi 310r Manuel d'utilisateur Page 13

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13
Fig. 26
Fig. 27
Fig. 28
6. Carefully reinstall the air filter. Be sure the filter is
sealed properly before placing it on the air filter base
(Fig. 28).
5. Squeeze the filter to spread the oil (Fig. 27).
MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)
4. Apply clean oil to the filter enough to saturate the
filter (Fig. 26).
CARBURETOR ADJUSTMENT
This unit is equipped with a diaphragm-type carburetor
that has been carefully calibrated at the factory. In most
cases, no further adjustment is required.
NOTE: To meet the 1995 California emission
regulations, the carburetor has
adjustment needle limiter caps to restrict
the amount of adjustment.
The condition of the air filter is important to the operation
of the blower. A dirty air filter will restrict the air flow, which
upsets the fuel-air mixture in 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 Filter
Maintenance.
If the following conditions are experienced, it may be nec-
essary to adjust the carburetor:
The engine will not idle
The engine hesitates or stalls on acceleration
The loss of engine power that is not corrected by
cleaning the air filter and muffler
NOTE: Careless adjustments can seriously
damage your unit.
Adjusting the Carburetor
1. Clean the air filter if it is dirty. Refer to Air Filter
Maintenance.
2. Make the initial settings with the engine stopped.
These initial settings should allow you to start and
warm up the unit before making the final adjustments.
Initial Idle Speed Setting
a) Remove the air filter cover and insert a screwdriver
through the opening in the air filter base (Fig. 29).
b) For Walbro carburetors: Back the idle speed screw
(Fig. 30 - page 14) out (counterclockwise) until it
does not contact the carburetor throttle lever. Then
turn the screw in (clockwise) until it just begins to
move the throttle lever; then continue turning 2 full
turns.
c) For Zama carburetors: Back the idle speed screw
(Fig. 31 - page 14) 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.
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