MCS-997065 - HD 6R12PP. 12mm threaded. Used with 18mm spark plug socket. Equipped with a U-groove platinum tip. Platinum plugs are more durable; have a wider heat range and will work with a lower voltage. By maintaining a precise gap over a longer period it will provi

Fitment:
99-17 Twin Cam; 86-22 XL (excl. XR1200) (NU)