MCS-948537 - Fitment: Yamaha: 2002 BT 1100 Bulldog (RP05); 1999 XVS 1100 A Drag Star Classic (VP05); 07-08 XVS 1100 A Drag Star Classic (VP05); 1995 XV 535 VIRAGO DX.

MCS-931612 - H-D RA6HC (10R12X). 12mm threaded. Requires 16mm spark plug wrench socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated shell; to help keep...

MCS-931615 - (6R12). 12mm threaded. 19mm (1/2") long reach. Used with a 16mm spark plug socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated shell; to...

MCS-931614 - H-D 5R6A. 14mm threaded; long reach. Used with a 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented UltrasealT coated shell; to help keep the spark plug body corrosion free and better...

MCS-931611 - H-D 10R12A. 12mm threaded. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated shell; to help keep the spark plug body corrosion free and better...

MCS-931609 - 7/8-18 threaded. 5/8" (16mm) reach. Used with 24mm spark plug socket. Fits early IOE Intake Over Exhaust (half OHV and half Flathead) models. Copper-core center electrode. Spark plug comes with the patented UltrasealT coated...

MCS-931608 - H-D #4. 14mm threaded. 12.7mm (1/2") Short reach. Used with a 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented UltrasealT coated shell; to help keep the spark plug body corrosion free...

MCS-931607 - H-D #4R. 14mm threaded. 12.7mm (1/2") short reach. Used with a 21mm spark plug socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated shell;...

MCS-931606 - H-D 3-4. 14mm threaded; 1/2" (12.7mm) short reach. Used with 21mm spark plug socket. Copper-core center electrode. Spark plug comes with the patented UltrasealT coated shell; to help keep the spark plug body corrosion free...

MCS-931604 - 4-pack. (5R6A). 14mm threaded; 3/4" (19mm) long reach. Use with a 21mm spark plug socket. Copper-core center electrode with the patented SAC-9 semiconductor resistor. Spark plug comes with the patented UltrasealT coated...

MCS-931601 - H-D #4; one range colder. M18 X 1.5 threaded. 1/2" (12.7mm) short reach. Used with 24mm spark plug socket. This D14 (H-D #4) is one range colder (runs less hot/removes heat faster) than the standard D16 (H-D #3) spark plug....

MCS-931600 - H-D #3; standard heat range. M18 X 1.5 threaded. 1/2" (12.7mm) short reach. Used with a 24mm spark plug socket. This D16 (H-D #3) is the standard recommended spark plug for regular riding. For extensive high speed riding;...