Spark Plug: Testing and Inspection

CAUTIONS:
- Handle platinum plugs with care.
- Do not attempt to adjust gap on platinum plugs.

NOTE: Platinum tipped spark plugs can be identified by blue lines on the ceramic. Do not reuse them by cleaning or regapping. If platinum tip gap exceeds 0.051 in (1.3 mm) replace spark plugs.

1. Inspect plugs for the following:
- Broken insulator
- Worn electrode
- Carbon deposits
- Damaged or broken gasket
- Burnt condition of porcelain insulator at spark gap.

NOTE: Dark deposits indicate too rich a fuel mixture. Light (white), deposits indicate too lean a fuel mixture, advanced ignition timing or insufficient plug tightening.

Spark Plug Gap:

2. Gap plugs to specifications.
Spark Plug Gap: 0.039 - 0.043 in (1.0 - 1.1 mm)