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Cleaning the fuel filter cup
Close the fuel tap. Remove the cup with the O-ring and clean with non-inflammable or hardly-inflammable sol-
vent. Let dry thoroughly, then reassemble and tighten well. Turn the fuel valve on, and check for leaks.
Spark plug
Recommended spark plug: BP6ES-11, BPR6ES-11 (NGK), W20EP-U11, W20EPR-U11 (ND).
Caution: Never use a spark plug of incorrect heat range.
To ensure proper motor operation, the spark plug must be properly gapped and free of deposits.
1. Remove the spark plug cap, and use a spark plug wrench to remove the plug.
Warning:
If the motor has been running, the muffler will be very hot. Be careful not to touch the muffler.
2. Visually inspect the spark plug. Discard it if the insulator is cracked or chipped. Clean the spark plug with a
wire brush if it is to be reused.
3. Measure the plug gap with a feeler gauge. The gap should be 0,7-0,8 mm (0.039-0.043 in). Correct as nec-
essary by bending the side electrode.
4. Check that the spark plug washer is in good condition, and thread the spark plug in by hand to prevent
cross-threading.
5. After the spark plug is seated, tighten with a spark plug wrench to compress the washer.
Note:
If installing a new spark plug, tighten 1/2 turn after the spark plug seats to compress the wash-
er. If reinstalling a used spark plug, tighten 1/8-1/4 turn after the spark plug seats to compress
the washer.
Caution:
The spark plug must be secrely tightened. An improperly tightened spark plug can become
very hot and may damage the motor.
Carburettor adjustment
* Start the motor and allow it to warm up to normal operting temperature.
* With the motor idling, turn the pilot screw in or out to the setting that produces the highest idle rpm. The
correct setting will usually be approximately 2 1/4 turns from the fully closed position.
Caution: Do not tighten the pilot screw against its seat, this will damage the piot screw or seat. After the
pilot screw is correctly adjusted, turn the throttle stop screw to obtain the standard idle speed.
Standard idle speed: 1 400 + 150 rpm.
1. Pilot screw
T00836GB.fm
2. Throttle stop screw
22
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