Wacker Neuson BPU 3050A Operator's Manual - page 21
T00858GB
19
MAINTENANCE
Fuel strainer cup cleaning
Turn the fuel valve to Off. Remove the sediment cup and O-ring, and wash them in nonflammable or high flash
point solvent. Dry them thoroughly, and reinstall securely. 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 engine 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 engine 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 securely tightened. An improperly tightened spark plug can become
very hot and may damage the engine.
Carburettor adjustment
*
Start the engine and allow it to warm up to normal operting temperature.
*
With the engine 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 as this will damage the pilot 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
2. Throttle stop screw