Description The Time-Sert 4212 spark plug thread repair kit is commonly used on Harley Davidson and other motorcycles. Inserts are not included in this thread repair kit but can be purchased here. This spark plug thread repair kit is for first time thread repair only. THIS KIT DOES NOT CONTAIN INSERTS. PLEASE ORDER YOUR INSERTS FROM THE LINKS BELOW. Click Here For Instructions Click here: for video instructions Order Washer Seat Inserts Click Here Get Useful Tools, Tap Guides, and More Click Here