Ryobi 765r User Manual download pdf (Page 16)

Check Fuel Mixture

Old and/or improperly mixed fuel is usually the reason

for improper unit performance. Drain and refill the tank

with fresh, properly-mixed fuel prior to making any

adjustments. Refer to Oil and Fuel Information.

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

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. Refer to Starting/Stopping

Instructions.

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. 28). Turn the idle speed screw in, clockwise,

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

idles smoothly.

CARBURETOR ADJUSTMENT

The idle speed of the engine is adjustable through the air

filter/muffler cover (Fig. 28).

NOTE: Careless adjustments can seriously damage your

unit. An authorized service dealer should make

carburetor adjustments.

3. If the engine appears to be idling too fast, 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 should solve most engine

problems. If not and all of the following are true:

• 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.

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug, or equivalent. The

correct air gap is 0.020 inch (0.5 mm). Remove the plug

after every 25 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Grasp the plug

wire firmly and pull it from the spark plug.

2. Clean around the spark plug. Remove the spark plug

from the cylinder head by turning a 5/8-inch socket

counterclockwise.

3. Replace a cracked, fouled or dirty spark plug. Set

the air gap at 0.020 in. (0.5 mm) using a feeler gauge

(Fig. 29).

4. Install a correctly-gapped spark plug in the cylinder

head. Tighten by turning the 5/8-inch socket

clockwise until snug.

If using a torque wrench torque to:

110-120 in.•lb. (12.3-13.5 N•m)

Do not over tighten.

0.020 in.

(0.5 mm)

Fig. 29

CAUTION: Do not sand blast, scrape or

clean electrodes. Grit in the engine could

damage the cylinder.

WARNING: The cutting attachment will spin

during idle speed adjustments. Wear

protective clothing and observe all safety

instructions to prevent serious personal injury.

WARNING: To prevent serious personal

injury, make sure the cutting attachment

has stopped rotating before you turn it off

and set it down.

MAINTENANCE AND REPAIR INSTRUCTIONS

Idle Speed Screw

Fig. 28

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 67 68

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Ryobi 765r User Manual Page 16

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