This is a genuine NGK R6918C-9 spark plug. NGK spark plugs come pre-gapped they are recommended and used by OEM manufacturers.
PLEASE NOTE! If you have a 1999 Ultra150 with the original ignition you need a special spark plug R6918C9. DO NOT install a standard BR9ES NGK plug. If you do not know which ignition your machine has, contact your local dealer.
