Don't forget to inspect the Ignition Lead Spring when cleaning the spark plugs
Contact springs are easy to replace as they simply unscrew from the insulator. Sometimes though they are difficult to unscrew. You might have to unwind the spring by bending it.
Excessive spring burning can be caused by a failed spark plug resistor. Check the ohm resistance of the spark plug. Compare with new or other plugs and replace any with low resistance.
On old harnesses that use the now obsolete ceramic insulator you have to replace the entire ceramic as the spring does not detach from the ceramic.
Ceramic Part Number Information:
Champion Part Number AS681L Alternate Part Number 10-50484. Military Part Number AN4164-1. Size 1 inch by .290 inch by .374 inch.
Champion Part Number AS681. Alternate Part Number 71489 or 626721. Military Part Number AN4164-2. Size .562 inch by .290 inch by .374 inch.
Slick harness: Spring Part Number: M-2929.
Caution DO NOT PULL THE SPRING. On the Slick harness as you can pull the spring and attaching electrode screw right out of the insulator. It is a pain to get it back in correctly.
Bendix, TCM, Skytronics Style Harness Spring Part Number: 10-32326
