Maintaining The Spark Plug - Troy-Bilt TB25CB Operator's Manual

MAINTAINING THE SPARK PLUG

WARNING:
engine could damage the cylinder.
1. Stop the engine and allow it to cool. Grasp the spark plug boot firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug from the cylinder head with a 5/8-inch socket,
turning counterclockwise.
3. Inspect the spark plug. If the spark plug is cracked, fouled or dirty, replace it with:
• USA: replacement part #753-06847, a Champion RDJ7J or an equivalent spark plug.
• Canada: replacement part #794-00097, a Champion QDJ7J or an equivalent spark plug.
4. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm) (Fig. 20).
5. Install the spark plug in the cylinder head. Tighten the spark plug with a 5/8-inch socket, turning it
clockwise until snug.
NOTE: If using a torque wrench, torque to:
110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.
6. Reattach the spark plug boot.
Do not sand blast, scrape or clean spark plug electrodes. Grit in the
0.025 in.
(0.635 mm)
Fig. 20
27