Removal and Installation

Caution: After installing new plugs to cure a high speed miss condition, avoid wide open throttle operation for at least 50 miles (80 km). This allows deposits in the combustion chamber to shift gradually, avoiding premature plug fouling by loose deposits.

Note: Be sure to note routing of secondary ignition cables. Failure to route cables properly may result in radio interference, ignition cross fire, or ignition short to ground.

Removal

1. Spray compressed air around spark plug to prevent foreign material from entering combustion chamber.
2. Remove spark plug wire by grasping boot and turning 1/2 turn while pulling boot back in a steady motion.
3. Remove spark plug using socket with foam insert.

Inspection

Inspect plug for:

1. Cracked or damaged threads or insulator
2. Worn or bent electrodes
3. Damaged gasket
4. Electrode wear or excessive carbon deposits

Installation

1. Start plug in cylinder head by hand to prevent cross threading.
Caution: Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap.
2. Tighten spark plugs to 20 ft-Lbs (28 Nm) torque.

3. Install secondary ignition cables on spark plugs, (be sure connectors are pushed onto plug completely).