03-09-15, 12:07 AM
After you do the cleaning that Paul suggested you may buy spark plug thread chaser you need 10mm one
http://www.sparkplugs.co.uk/thread-chaser-10-12mm
Very carefully with WD40 clean the thread with the chaser back and forth.
http://www.sparkplugs.co.uk/thread-chaser-10-12mm
Very carefully with WD40 clean the thread with the chaser back and forth.