MAINTENANCE AND REPAIR INSTRUCTIONS
16
0.020 in.
(0.5 mm.)
Fig. 30
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the
Air filter/Muffler cover (Fig. 29).
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
Pg. 15.
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
personal injury.
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. 10.
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. 29). Turn the idle speed screw in,
clockwise
,
1/8 of a turn at a time (as needed) until the engine
idles smoothly.
Fig. 29
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.
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 50 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 in. socket
counterclockwise.
3. Replace cracked, fouled or dirty spark plug. Set the
air gap at
0.020 in. (0.5 mm.)
using a feeler gauge
(Fig. 30).
CAUTION:
Do not sand blast, scrape, or
clean electrodes. Grit in the engine could
damage the cylinder.
4. Install a correctly gapped spark plug in the cylinder
head. Tighten by turning the 5/8 in. 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.
Idle Speed Screw
Summary of Contents for 767rj
Page 20: ...NOTES 20 ...
