Spark Plug; Spark Arrester (If Equipped) - DeWalt DW650LAG Instruction Manual

4. Remove the oil drain plug (D).
5. Allow ample time for all oil to drain out.
6. Install the oil drain plug.
7. Fill with recommended oil, refer to Oil Recommendations
under Assembly.
8. Replace dipstick and tighten securely.
9. Reconnect spark plug wire.
10. Dispose of oil according to local, state and federal laws and
regulations.

Spark Plug

Use recommended spark plugs, see specifications for correct spark
plug. To ensure proper engine operation, the spark plug must be
properly gapped and free of deposits.
WARNING: If the engine has been running, the muffler will be very
hot. To reduce the risk of injury, allow cooling before proceeding.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench (not supplied) to remove the spark
plug.
4. Visually inspect the spark plug. Replace it if the insulator is
cracked or chipped. Clean the spark plug with a wire brush if it
is going to be reused.
WARNING: Always wear certified safety equipment:
ANSI Z87.1 eye protection (CAN/CSA Z94.3) with side
shields.
5. Measure the plug gap with a feeler gauge (DD).
Correct as necessary by carefully bending the
side electrode. The gap should be: 0.70 –0.80 mm
(0.028 – 0.031 in).
6. Make sure the spark plug washer is in good condition. Thread
the spark plug in by hand to prevent cross threading.
7. After the spark plug is seated, tighten with a spark plug wrench
to compress the washer. If installing a new spark plug, tighten
the spark plug 1/2 turn after it seats to compress the washer.
If reinstalling a used spark plug, tighten 1/8–1/4 turn after the
spark plug seats to compress the washer. Do not overtighten.
8. Securely replace spark plug cap.
NOTE: The spark plug must be securely tightened. An improperly
tightened spark plug can become very hot and could damage the
engine. Never use spark plugs which have an improper heat range.
Use only the recommended spark plugs or equivalent.

Spark Arrester (if equipped)

WARNING: Risk of explosion or fire. DO NOT operate engine
without spark arrestor (S).
WARNING: If the engine has been running, the muffler will be
very hot. To reduce the risk of injury, allow engine to cool before
proceeding.
NOTE: The spark arrester must be serviced every 100 hours to
maintain its efficiency.
1. Remove the spark arrestor screws (EE) and remove the spark
arrestor (S).
EE
DD
11
S
S