Ryobi 2079r Operator's Manual download pdf (Page 17)

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable though the Air

filter/muffler cover (Fig 23).

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. 9.

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.

Adjust Idle Speed Screw

WARNING: The cutting attachment may be

spinning during carburetor adjustments. Wear

your protective equipment and observe all

safety instructions. For units equipped with a

clutch, be sure the cutting attachment stops

turning when the engine idles. When the unit is

turned off make sure the cutting attachment

has stopped before the unit is set downIf 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.

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

the engine stops, turn the idle speed screw in

clockwise with a small phillips or flat blade

screwdriver 1/8 of a turn at a time (as needed), until

the engine idles smoothly (Fig. 23).

MAINTENANCE AND REPAIR INSTRUCTIONS

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

Fig. 23

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 23 24

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Ryobi 2079r Operator's Manual Page 17

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