CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjust- ment screw is on the rear side of the carburetor (Fig. 21).
NOTE: Careless adjustments can seriously damage
your unit. Only a Sears or other qualified dealer should make carburetor adjustments.
CLEAN AIR FILTER
The condition of the air filter is important to the opera- tion of the unit. A dirty or oil saturated air filter will restrict air flow. 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 Cleaning Air Filter (p.13).
ADJUST IDLE SPEED SCREW
If, after checking the fuel 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 (p.10) instructions.
2.Release the throttle trigger and let the engine idle. If the engine stops, use a small phillips or fiat blade to turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
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, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all of the following are true, check the spark plug for proper gap and condition.
•the engine will not idle
•the engine hesitates or stalls on acceleration
•there is a loss of engine power
If problem still occurs, have the carburetor adjusted by a Sears or other qualified service dealer.
WARNING:
Do not sand blast, scrape, or clean spark plug electrodes. Grit in the engine could damage the cylinder.
Idle Adjustment
Screw
Fig.21
REPLACING THE SPARK PLUG
Use NGK CMR6A or Champion RCJ6Y replacement spark plugs.
The correct air gap is 0.02 in. (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. Remove the spark plug cover. Grasp the plug wire firmly and pull the cap from the spark plug.
2.Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by using a 5/8 in. socket, turning it counterclockwise.
3.Replace cracked, fouled or dirty spark plug. Set the air gap at 0.02 in. (0.5 mm.) using a feeler gauge (Fig 22).
4.Install a
If using a torque wrench torque to:
NOTE: Do not over tighten.
0.02 in.
(0.5 mm)
Fig.22
14
