Autolite 4164 Spark Plug. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration. Very popular replacement plug among Harley riders for many years. For use on Twin Cam and Sportster models.
Autolite® Copper Core plugs are your industry standard. Replaces HD 6R12, Harley 32317-86A
- Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
- Multi-rib insulator reduces danger of "flash-over"
- One-piece terminal post adds strength
- Resistor reduces radio frequency interference (RFI) and electrode erosion
- Cold-formed steel shell precision rolled threads
- Full copper core electrode provides better performance in all conditions
Spark plugs sold each.
Fitment:
| Twin Cam 88/96/103 | 1999-present |
| XL Sportster 883/1200 | 1986-present |
Pictured product appearance is subject to change.
As a manufacturer and supplier we are unable to provide any repair or diagnostic advice. Please consult a factory service manual or qualified motorcycle technician.