Ryobi 770rEB Manuel d'utilisateur télécharger pdf (Page 21)

MAINTENANCE AND REPAIR INSTRUCTIONS

Fig. 38

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable through the

Air filter/Muffler cover (Fig. 38).

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make

carburetor adjustments.

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason

for the unit not running properly. Drain and refill the tank

with fresh, properly mixed fuel prior to making any

adjustments. Refer to Oil and Fuel Information Pg. 11.

Clean Air Filter

The condition of the air filter is important to the operation

of the unit. A dirty air filter will restrict air flow and

change the air/fuel mixture. This is often mistaken for an

out of adjustment carburetor. Check the condition of the

air filter before adjusting the idle speed screw. Refer to

Air Filter Maintenance Pg. 20.

Adjust Idle Speed Screw

WARNING: The cutting attachment may be

spinning during idle speed adjustments.

Wear protective clothing and observe all

safety instructions to prevent serious person-

al injury.

NOTE: The cutting attachment should not rotate when

the engine idles.

3. If the cutting attachment rotates when the engine

idles, turn the idle speed screw counterclockwise

1/8 of a turn at a time (as needed), to reduce idle

speed.

Checking the fuel mixture, cleaning the air filter, and

adjusting the idle speed screw should solve most engine

problems.

If not and:

• The engine will not idle,

• The engine hesitates or stalls on acceleration,

• There is a loss of engine power,

have the carburetor adjusted by an authorized service

dealer.

WARNING: When the unit is turned off make

sure the cutting attachment has stopped

before the unit is set down to prevent serious

personal injury.

Idle Speed Screw

6. Replace the air filter in the air filter/muffler cover

(Fig. 34).

NOTE: Operating the unit without the air filter and air

filter/muffler cover assembly, will VOID the

warranty.

Reinstalling the Air filter/Muffler Cover

1. Place the air filter/muffler cover over the back of the

carburetor and muffler.

NOTE: The choke lever must be in the PARTIAL choke

position (B) (Fig. 33) to install the air filter/muffler

cover.

2. Insert the four (4) screws into the holes in the air

filter/muffler cover (Fig. 33) and tighten.

Do not over tighten.

5. Squeeze the filter to spread and remove excess oil

(Fig. 37).

Fig. 37

If after checking the fuel mixture and cleaning the

air filter the engine still will not idle, adjust the idle speed

screw as follows.

1. Start the engine and let it run at a high idle for a

minute to warm up. See Starting/Stopping

Instructions

, Pg. 12.

2. Release the throttle trigger and let the engine idle. If

the engine stops, insert a small phillips or flat blade

screwdriver into the hole in the air filter/muffler cover

(Fig. 38). Turn the idle speed screw in,

clockwise,

1/8 of a turn at a time (as needed) until the engine

idles smoothly.

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Ryobi 770rEB Manuel d'utilisateur Page 21

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