How Do You Use Spark Plug Indexing on Washer

Indexing spark plugs can prevent pop-up piston dome contact from closing up the plug gaps and May also enhance flame propagation in older inefficient combustion chambers. Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons.

Is spark plug indexing necessary?

Indexing spark plugs can prevent pop-up piston dome contact from closing up the plug gaps and May also enhance flame propagation in older inefficient combustion chambers. Spark plug indexing sometimes is necessary to avoid side-electrode contact with high-dome pistons.

What is the washer on a spark plug for?

034 thick washers. The soft copper spark plug washers allow racers to adjust spark plug ground electrode position for optimum flame front generation and maximum plug-to-piston clearance.