Adjusting the Carburetor
Differences in fuel, temperature, altitude or load may require minor carburetor adjustments. The carburetor on this engine is equipped with an idle mixture valve with a limiter which allows some adjustment, and an idle speed adjustment screw. Remember that the air cleaner must be assembled to the carburetor before re- starting the engine. Refer to page 14 for details.
NOTE: Engines, operated at approximately 3000 to 5000 feet above sea level, may require a high altitude carburetor nozzle. If your riding mower performs erratically, contact Sears service center for the nozzle.
To adjust the carburetor, follow the steps below:
1.Start the engine and run it for at least 5 minutes to warm up.
2.With the engine running, place throttle control in SLOW position.
3.Lift the hood assembly up as instructed on page 7.
4.Remove the black cap from the rider frame. See Figure 16. Access the carburetor throttle lever and idle speed screw from this opening.
IDLE MIXTURE
VALVE
WITH LIMITE R
Carbureto/r
Throttle
Lever
Figure 16
5.Rotate carburetor throttle lever against the idle speed screw and hold it. Turn idle speed screw to obtain 1750 rpm, using a tachometer to measure.
6.Rotate idle mixture valve full travel clockwise and then
7.Place idle mixture valve in middle of travel.
8.Move throttle control to FAST position. The engine
should accelerate smoothly. If it does not, adjust idle mixture valve
9.Replace the black cap on the riding mower frame and put the hood assembly back.
the cranking or charging circuit where insulation may have rubbed through and exposed bare wire.
2.Replace the wire or repair with electrician's tape if the wire strands have not been damaged. Also look for a wire pinched between body panels, burned by the exhaust pipe or muffler, or rubbed against a moving part.
3.Stop the riding mower and engage the parking brake. Remove ignition key.
4.Pivot the hood assembly up. Disconnect the spark plug wire and ground it.
5.Pull the fuse out of the lead wire.
6.Replace with new automotive fuse.
7.Make sure to reconnect the spark plug wire before pivoting the hood assembly back.
Belt Replacement
There are two drive belts and one deck belt in this unit; follow description below to identify the belts.
•Deck belt goes from the deck pulley to the lower sheave in engine pulley.
•Lower drive belt goes from the variable speed pulley to the transmission pulley.
•Upper drive belt goes from the variable speed pulley to the upper sheave of engine pulley.
Periodically check if these belts are too loose or damaged. If so, replace with new belt.
Deck Belt
1.Engage the parking brake and turn the ignition off. Pivot the hood assembly up and remove the grass catcher. Remove the spark plug wire.
2.Put the deck at the lowest cutting height by adjusting the cutting height adjustment lever to the lowest position.
Imaginary
BeltLineBelt
Keeper "A"
ut
Pulley
Fuse Replacement
The fuse is located next to the spark plug under the rear
frame. Fuses seldom fail without a reason. If the fuseScrew blows, the source problem must be corrected or the
new fuse wilt blow again.
1.Check for loose connections in the fuse holder and replace holder if necessary. A dead short may be in
Pulley
Figure 17
19
