Harley Spark Plug
Harley Bike Spark Plugs at JJ Motorsports
Keep your Harley running strong with premium spark plugs from JJ Motorsports, featuring standard and iridium designs for reliable ignition and maximum performance on Sportster XL, Twin Cam, Evo, and Big Twin engines. These high-quality plugs deliver hotter sparks and longer life for everyday riding or performance builds.
Shop Drag Specialties spark plugs for proven reliability. Explore related categories such as Harley lights and electrical for coils and wires, or Harley for exhaust and tuning to complete your ignition system.
Top Harley Spark Plugs
- Drag Specialties Spark Plugs 79-85 XL E18-6661SDS – Standard plugs for 1979-1985 XL Sportster; classic heat range for Ironhead engines.
- Drag Specialties Iridium Spark Plugs TC/XL E18-6655IDS – Iridium plugs for Twin Cam and Sportster; extended life and hotter spark.
- Drag Specialties Spark Plugs 99-17 TC/XL E18-6655SDS – Standard plugs for 1999-2017 Twin Cam and XL; OEM-style performance.
Browse our in-stock inventory below with same-day shipping and expert support. Free shipping on orders over $99! Questions? Contact us for fitment advice!
- Product
- Qty in Cart
- Quantity
- Price
- Subtotal
-
DRAG SPECIALTIES Spark Plug - R Max E18-6759SDS
DRAG SPECIALTIES
$33.87A reliable spark plug is the foundation of consistent ignition timing and engine performance—especially critical in high-demand racing applications where misfires cost races. The DRAG SPECIALTIES R Max E18-6759SDS delivers dependable spark delivery with...21030571- SKU:
- 21030571
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
$33.87 -
DRAG SPECIALTIES Spark Plug - Challenger E18-6729IDS
DRAG SPECIALTIES
$38.11A quality spark plug is fundamental to engine reliability and performance—and the DRAG SPECIALTIES Challenger E18-6729IDS delivers both with iridium electrode technology that requires less voltage while producing a hotter, more consistent spark. This...21030575- SKU:
- 21030575
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
$38.11 -
DRAG SPECIALTIES Spark Plug - Indian E18-6656IDS
DRAG SPECIALTIES
$33.87An iridium spark plug delivers a hotter, more reliable spark with significantly extended service intervals—meaning fewer plug changes and better engine performance over time. The Indian E18-6656IDS exceeds OEM specifications, making it the smart choice...21030576- SKU:
- 21030576
- Availability:
- Ships Same Business Day
- Weight:
- 0.24 LBS
$33.87 -
DRAG SPECIALTIES Spark Plug - Scout/FTR E18-6730SDS
DRAG SPECIALTIES
$16.91Reliable ignition is the foundation of consistent performance, and a quality spark plug directly impacts combustion efficiency, throttle response, and engine longevity. The DRAG Specialties Scout/FTR E18-6730SDS delivers the thermal stability and...21030577- SKU:
- 21030577
- Availability:
- Ships Same Business Day
- Weight:
- 0.22 LBS
$16.91 -
NGK SPARK PLUGS Spark Plug - SILMAR7A9S 93675
NGK SPARK PLUGS
$26.95Reliable ignition is the foundation of consistent engine performance, whether you're on the track or tuning on the dyno. NGK's SILMAR7A9S spark plugs deliver the precise spark timing and heat range your high-performance engine demands, minimizing misfire...21030514- SKU:
- 21030514
- Availability:
- Ships Same Business Day
- Weight:
- 0.05 LBS
- MODEL:
- SILMAR7A9S
- SPARK GAP IMPERIAL:
- 0.035'
- TERMINAL CONFIGURATION:
- SOLID TERMINAL
- THREAD REACH METRIC:
- 26.5 MM
- UNITS:
- EACH
- ELECTRICAL RESISTANCE:
- 5K OHMS
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- TYPE:
- RESISTOR
- CENTER ELECTRODE PROJECTION:
- NON-PROJECTED
- ELECTRODE TIP MATERIAL:
- IRIDIUM
- HEAT RANGE:
- 7
- HEX SIZE METRIC:
- 14 MM
- SPARK GAP METRIC:
- 0.9 MM
- CENTER ELECTRODE TYPE:
- FINE WIRE
- GROUND ELECTRODE SHAPE:
- STANDARD
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- UTV
- STYLE:
- LASER IRIDIUM
$26.95 -
NGK SPARK PLUGS Spark Plug - BPR4ESSOLID 6578
NGK SPARK PLUGS
$6.95Spark plug selection directly impacts engine performance, throttle response, and long-term reliability. The NGK BPR4ESSOLID delivers a wide operating heat range that eliminates fouling and preignition issues—critical when pushing your engine hard or...21030230- SKU:
- 21030230
- Availability:
- Ships Same Business Day
- Weight:
- 0.15 LBS
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- THREAD REACH METRIC:
- 19.1 MM
- TYPE:
- RESISTOR
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRICAL RESISTANCE:
- 5K OHMS
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEAT RANGE:
- 4
- MODEL:
- BPR4ESSOLID
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- SNOW
- STYLE:
- STANDARD
- HEX SIZE METRIC:
- 20.6 MM
- SPARK GAP IMPERIAL:
- 0.031'
- TERMINAL CONFIGURATION:
- SOLID TERMINAL
- UNITS:
- EACH
- GROUND ELECTRODE SHAPE:
- STANDARD
- SPARK GAP:
- 0,8 MM (0,031')
- SPARK GAP METRIC:
- 0.8 MM
$6.95 -
NGK SPARK PLUGS NGK Spark Plug 7901
NGK SPARK PLUGS
$25.95NGK Laser Iridium spark plugs deliver the precise ignition timing your engine demands, whether you're chasing lap times or maintaining daily reliability. The iridium-tipped center electrode resists wear far longer than conventional plugs, keeping your...IJR7A9- SKU:
- IJR7A9
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- ELECTRODE TIP MATERIAL:
- IRIDIUM
- HEAT RANGE:
- 7
- TERMINAL CONFIGURATION:
- THREADED STUD
- UNITS:
- EACH
- CENTER ELECTRODE PROJECTION:
- NON-PROJECTED
- CENTER ELECTRODE TYPE:
- FINE WIRE
- PRODUCT NAME:
- SPARK PLUG
- SPARK GAP IMPERIAL:
- 0.035'
- THREAD SIZE:
- 12 MM
- MODEL:
- IJR7A-9
- RIDING STYLE:
- ATV
- TYPE:
- RESISTOR
- ELECTRICAL RESISTANCE:
- 5K OHMS
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- GROUND ELECTRODE SHAPE:
- STANDARD
- STYLE:
- IRIDIUM
$25.95 -
NGK SPARK PLUGS NGK Spark Plug 91175
NGK SPARK PLUGS
$16.95NGK Laser Iridium Spark Plugs (91175) deliver superior ignition performance and extended service life, making them ideal for high-performance engines that demand reliability and consistent combustion. The fine-wire iridium center electrode and platinum...21030393- SKU:
- 21030393
- Availability:
- Ships Same Business Day
- Weight:
- 0.06 LBS
- ELECTRODE TIP MATERIAL:
- IRIDIUM
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEAT RANGE:
- 7
- PRODUCT NAME:
- SPARK PLUG
- THREAD SIZE:
- 10 MM
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- CENTER ELECTRODE TYPE:
- FINE WIRE
- ELECTRICAL RESISTANCE:
- -
- RIDING STYLE:
- STREET
- SPARK GAP IMPERIAL:
- 0.035'
- TERMINAL CONFIGURATION:
- SOLID TERMINAL
- UNITS:
- EACH
- GROUND ELECTRODE SHAPE:
- TAPER CUT
- MODEL:
- CR7EIA-9
- STYLE:
- IRIDIUM
- TYPE:
- RESISTOR
$16.95 -
NGK SPARK PLUGS Spark Plug - CR6E 6965
NGK SPARK PLUGS
$13.95If you're serious about extracting maximum performance from your engine, spark plug selection matters more than most realize. The NGK CR6E 6965 delivers a wider effective heat range than standard plugs, eliminating the fouling and preignition issues that...CR6E- SKU:
- CR6E
- Availability:
- Ships Same Business Day
- Weight:
- 0.08 LBS
- RIDING STYLE:
- ATV
- TERMINAL CONFIGURATION:
- THREADED STUD
- UNITS:
- EACH
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRICAL RESISTANCE:
- 5K OHMS
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEX SIZE METRIC:
- 16 MM
- THREAD REACH METRIC:
- 19.1 MM
- TYPE:
- RESISTOR
- GROUND ELECTRODE SHAPE:
- STANDARD
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- SPARK GAP:
- 0,8 MM (0,031')
- SPARK GAP IMPERIAL:
- 0.031'
- SPARK GAP METRIC:
- 0.8 MM
- STYLE:
- STANDARD
- CENTER ELECTRODE PROJECTION:
- NON-PROJECTED
- HEAT RANGE:
- 6
- MODEL:
- CR6E
$13.95 -
DRAG SPECIALTIES Spark Plugs - '02-'17 VROD E18-6656SDS
DRAG SPECIALTIES
$15.85Reliable spark plugs are non-negotiable for consistent engine performance and longevity—especially in high-performance V-Rod applications where thermal stress demands superior insulation and heat management. The DRAG Specialties E18-6656SDS delivers the...21030197- SKU:
- 21030197
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEX SIZE METRIC:
- 16 MM
- STYLE:
- COPPER
- TERMINAL CONFIGURATION:
- REMOVABLE NUT
- GROUND ELECTRODE SHAPE:
- STANDARD
- MODEL:
- DCPR8E
- THREAD REACH:
- 19,1 MM (3/4')
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- THREAD REACH METRIC:
- 19.1 MM
- HEAT RANGE:
- 8
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- TYPE:
- RESISTOR
- UNITS:
- PAIR
$15.85 -
DRAG SPECIALTIES Spark Plugs - M8/XG E18-6724DS
DRAG SPECIALTIES
$15.85Reliable ignition is non-negotiable in high-performance applications, and these Drag Specialties spark plugs deliver the dependable spark your engine demands. Built with premium materials engineered for thermal stability and electrical consistency, they...21030358- SKU:
- 21030358
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 6
- STYLE:
- COPPER
- THREAD REACH:
- 19,1 MM (3/4')
- HEX SIZE METRIC:
- 16 MM
- MODEL:
- CR9E
- PRODUCT NAME:
- SPARK PLUG
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- RIDING STYLE:
- STREET
- TERMINAL CONFIGURATION:
- SOLID TERMINAL
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- THREAD REACH METRIC:
- 19.1 MM
- TYPE:
- RESISTOR
- UNITS:
- PAIR
$15.85 -
DRAG SPECIALTIES Iridium Spark Plugs - M8/XG E18-6724IDS
DRAG SPECIALTIES
$33.87Stock spark plugs wear down and demand frequent replacements, robbing you of reliable ignition and consistent performance. DRAG Specialties Iridium plugs deliver a hotter, more efficient spark that burns cleaner and lasts longer—keeping your M8 or XG...21030359- SKU:
- 21030359
- Availability:
- Ships Same Business Day
- Weight:
- 0.25 LBS
- ELECTRODE TIP MATERIAL:
- IRIDIUM
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 6
- TERMINAL CONFIGURATION:
- REMOVABLE NUT
- RIDING STYLE:
- STREET
- THREAD REACH METRIC:
- 11.1 MM
- CENTER ELECTRODE TYPE:
- NECKED DOWN
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEX SIZE METRIC:
- 16 MM
- PRODUCT NAME:
- SPARK PLUG
- CENTER ELECTRODE PROJECTION:
- NON-PROJECTED
- MODEL:
- DCPR7EIX
- STYLE:
- IRIDIUM
- TYPE:
- RESISTOR
- UNITS:
- PAIR
$33.87 -
DRAG SPECIALTIES Spark Plugs - '79-'85 XL E18-6661SDS
DRAG SPECIALTIES
$13.73Reliable ignition is non-negotiable in vintage XL performance builds, and these DRAG Specialties spark plugs deliver the consistent spark and heat management your '79-'85 Harley demands. The 95% alumina ceramic insulator resists heat shock while the...21030205- SKU:
- 21030205
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- TYPE:
- RESISTOR
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 6
- MODEL:
- BPR6HS
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- STYLE:
- COPPER
- TERMINAL CONFIGURATION:
- THREADED STUD
$13.73 -
DRAG SPECIALTIES Plug Holder - Chrome - F/H-D 33-0030-SC1
DRAG SPECIALTIES
$40.23Long rides demand reliability, and carrying spare spark plugs isn't just a safety measure—it's peace of mind. This chrome-plated holder keeps two plugs within arm's reach, mounted securely behind the oil tank where they're protected yet accessible. For...DS196091- SKU:
- DS196091
- Availability:
- Ships Same Business Day
- Weight:
- 0.56 LBS
- MATERIAL:
- STEEL
- COLOR/FINISH:
- CHROME
- PRODUCT NAME:
- CADDY
- RIDING STYLE:
- STREET
- UNITS:
- EACH
- TYPE:
- SPARK PLUG
$40.23Qty in Cart: 0Quantity:Price:$40.23Subtotal: -
DRAG SPECIALTIES Iridium Spark Plugs - TC/XL E18-6655IDS
DRAG SPECIALTIES
$33.87Iridium spark plugs deliver a hotter, more efficient spark with significantly extended service intervals—meaning fewer plug changes and more reliable ignition performance over the life of your engine. The smaller iridium electrode requires less firing...21030231- SKU:
- 21030231
- Availability:
- Ships Same Business Day
- Weight:
- 0.20 LBS
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- STYLE:
- IRIDIUM
- TYPE:
- RESISTOR
- UNITS:
- PAIR
- RIDING STYLE:
- STREET
- CENTER ELECTRODE TYPE:
- NECKED DOWN
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEX SIZE METRIC:
- 16 MM
- MODEL:
- CR9EIX
- PRODUCT NAME:
- SPARK PLUG
- ELECTRODE TIP MATERIAL:
- IRIDIUM
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 7
- TERMINAL CONFIGURATION:
- REMOVABLE NUT
- THREAD REACH METRIC:
- 17.5 MM
$33.87 -
DRAG SPECIALTIES Spark Plugs - '99-'17 TC/XL E18-6655SDS
DRAG SPECIALTIES
$15.85Reliable ignition is non-negotiable in high-performance engines, and these Drag Specialties spark plugs deliver the consistent spark your '99-'17 TC/XL needs to stay in the powerband. The 95% alumina insulator and multi-rib design eliminate flashover...21030196- SKU:
- 21030196
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEX SIZE METRIC:
- 16 MM
- STYLE:
- COPPER
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- MODEL:
- DCPR7E
- THREAD REACH METRIC:
- 19.1 MM
- TYPE:
- RESISTOR
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 7
- TERMINAL CONFIGURATION:
- REMOVABLE NUT
- THREAD REACH:
- 19,1 MM (3/4')
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
$15.85 -
DRAG SPECIALTIES Spark Plugs - '57-'78 XL E18-6660SDS
DRAG SPECIALTIES
$14.79Keep your classic Harley running at peak performance with spark plugs engineered specifically for '57-'78 XL models. The DRAG Specialties E18-6660SDS delivers reliable ignition and extended service life through premium materials and precision...21030206- SKU:
- 21030206
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 6
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- TERMINAL CONFIGURATION:
- THREADED STUD
- TYPE:
- NON-RESISTOR
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- STYLE:
- COPPER
$14.79 -
DRAG SPECIALTIES Spark Plugs - '71-'85 XL E18-6658SDS
DRAG SPECIALTIES
$13.73Running vintage XL Harleys demands spark plugs engineered for reliability under extreme conditions—and these Drag Specialties plugs deliver exactly that. The 95% pure alumina insulator resists heat shock while the multi-rib design prevents flashover,...21030204- SKU:
- 21030204
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- PRODUCT NAME:
- SPARK PLUG
- RIDING STYLE:
- STREET
- GROUND ELECTRODE SHAPE:
- STANDARD
- HEAT RANGE:
- 6
- MODEL:
- B6L
- STYLE:
- COPPER
- UNITS:
- PAIR
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- TYPE:
- NON-RESISTOR
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- TERMINAL CONFIGURATION:
- THREADED STUD
$13.73 -
DRAG SPECIALTIES Spark Plugs - '48-'74 BT E18-6664SDS
DRAG SPECIALTIES
$13.73A quality spark plug is non-negotiable for reliable ignition and consistent performance in vintage Harley-Davidson powerplants. These DRAG Specialties plugs deliver dependable firing across a wide temperature range, ensuring your engine starts reliably...21030207- SKU:
- 21030207
- Availability:
- Ships Same Business Day
- Weight:
- 0.31 LBS
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- HEAT RANGE:
- 5
- STYLE:
- COPPER
- GROUND ELECTRODE SHAPE:
- STANDARD
- PRODUCT NAME:
- SPARK PLUG
- THREAD REACH METRIC:
- 8 MM
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- RIDING STYLE:
- STREET
- TERMINAL CONFIGURATION:
- THREADED STUD
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- HEX SIZE METRIC:
- 20.6 MM
- MODEL:
- R5670-5
- TYPE:
- RESISTOR
- UNITS:
- PAIR
$13.73 -
DRAG SPECIALTIES Spark Plugs - '75-'99 BT (HOT) E18-6657SDS
DRAG SPECIALTIES
$15.85Reliable spark plugs are non-negotiable for consistent ignition timing and engine performance on your Big Twin Harley. These DRAG SPECIALTIES plugs deliver the thermal stability and electrical integrity your '75-'99 BT demands, with a design engineered...21030198- SKU:
- 21030198
- Availability:
- Ships Same Business Day
- Weight:
- 0.30 LBS
- CENTER ELECTRODE PROJECTION:
- PROJECTED
- GROUND ELECTRODE CONFIGURATION:
- SINGLE
- GROUND ELECTRODE SHAPE:
- STANDARD
- STYLE:
- COPPER
- TERMINAL CONFIGURATION:
- REMOVABLE NUT
- CENTER ELECTRODE TYPE:
- STANDARD
- ELECTRODE TIP MATERIAL:
- NICKEL ALLOY
- MODEL:
- BPR4ES-11
- RIDING STYLE:
- STREET
- THREAD REACH METRIC:
- 19.1 MM
- HEAT RANGE:
- 4
- HEX SIZE METRIC:
- 16 MM
- PRODUCT NAME:
- SPARK PLUG
- THREAD REACH:
- 19,1 MM (3/4')
- TYPE:
- RESISTOR
- UNITS:
- PAIR
$15.85
