Plug Wire
Harley Bike Plug Wires at JJ Motorsports
Boost your Harley's spark with premium plug wire sets from JJ Motorsports, featuring 10.4mm braided and chromite designs for stronger ignition, reduced resistance, and reliable performance on Sportster, Dyna, Softail, Touring, and XL models. These high-quality wires deliver hotter sparks and custom looks.
Shop Magnum, Drag Specialties, and Sumax plug wires for proven durability. Explore related categories such as Harley lights and electrical for coils and batteries, or Harley for exhaust and cams to complete your ignition upgrade.
Top Harley Plug Wires
- Magnum Spark Plug Wire Set Sterling Chromite LL FL 17-3046C – Sterling Chromite braided set for late-model FL Touring; 10.4mm core for maximum spark energy.
- Drag Specialties Plug Wires 71-E78 XL SPW2-DS – Black 8.5mm wire set for 1971-1978 XL Sportster; direct-fit with silicone insulation.
- Sumax 10.4 mm Spark Plug Wire 00-17 ST Red 40231 – Red 10.4mm silicone wire set for 2000-2017 Softail; high-voltage for Twin Cam 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
-
SUMAX Spark Plug Wires - Black - FL 20038
SUMAX
$72.95Stock spark plug wires degrade under heat and create unnecessary resistance in your ignition system—robbing you of reliable spark delivery and efficiency. SUMAX Spiro-Pro wires eliminate that weakness with superior conductivity and heat resistance,...21040307- SKU:
- 21040307
- Availability:
- Ships Same Business Day
- Weight:
- 0.80 LBS
- WIRE LENGTH IMPERIAL:
- 13-1/2'
- WIRE LENGTH IMPERIAL:
- 18'
- WIRE LENGTH IMPERIAL:
- 30-1/2'
- CONNECTOR ANGLE:
- 90°
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- UNITS:
- 4 PACK
- WIRE DIAMETER:
- 8 MM
- COLOR/FINISH:
- BLACK
- CONNECTOR ANGLE:
- 135°
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- WIRE LENGTH IMPERIAL:
- 17'
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
SUMAX Spark Plug Wires - Red - FL 20238
SUMAX
$72.95Stock spark plug wires are a common bottleneck in ignition system performance—excessive resistance generates heat, kills efficiency, and forces you to replace them frequently. SUMAX Spark Plug Wires eliminate that problem with a Spiro-Pro core that...21040308- SKU:
- 21040308
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- CONNECTOR ANGLE:
- 90°
- WIRE DIAMETER:
- 8 MM
- WIRE LENGTH IMPERIAL:
- 18'
- WIRE LENGTH IMPERIAL:
- 30-1/2'
- COLOR/FINISH:
- RED
- CONNECTOR ANGLE:
- 135°
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- WIRE LENGTH IMPERIAL:
- 34'
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- WIRE LENGTH IMPERIAL:
- 17-1/4'
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
$72.95 -
SUMAX Spark Plug Wires - Blue - FL 20638
SUMAX
$72.95Stock plug wires degrade rapidly under heat and vibration, causing misfires, rough idle, and unreliable ignition timing. SUMAX Spark Plug Wires eliminate these issues with a Spiro-Pro core that delivers up to 10 times the conductivity of standard...21040311- SKU:
- 21040311
- Availability:
- Ships Same Business Day
- Weight:
- 0.78 LBS
- CONNECTOR ANGLE:
- 135°
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- WIRE LENGTH IMPERIAL:
- 18'
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- WIRE LENGTH IMPERIAL:
- 30-1/2'
- WIRE LENGTH IMPERIAL:
- 34'
- CONNECTOR ANGLE:
- 90°
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- UNITS:
- SET
- WIRE DIAMETER:
- 8 MM
- WIRE LENGTH IMPERIAL:
- 17-1/4'
$72.95 -
SUMAX 10.4 mm Spark Plug Wire - Black 40038
SUMAX
$98.95Spark plug wires are often overlooked, but they're critical to reliable ignition timing and engine performance. The SUMAX 10.4mm wires deliver the same dependable spark delivery as their 8mm counterparts while offering a more aggressive visual presence...21040313- SKU:
- 21040313
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MODEL:
- 409 PRO RACE
- PRODUCT NAME:
- WIRE
- WIRE LENGTH:
- -
- WIRE LENGTH IMPERIAL:
- -
- RIDING STYLE:
- ATV
- WIRE DIAMETER:
- 10.4 MM
- RIDING STYLE:
- OFF-ROAD
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
$98.95 -
SUMAX 10.4 mm Spark Plug Wire - Red 40238
SUMAX
$98.95If you're running a high-output ignition system, standard spark plug wires can become a bottleneck in your engine's performance. The SUMAX 10.4 mm Spark Plug Wire delivers the same proven suppression and durability as SUMAX's 8mm line, but with a larger...21040314- SKU:
- 21040314
- Availability:
- Ships Same Business Day
- Weight:
- 1.10 LBS
- MODEL:
- 409 PRO RACE
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ATV
- WIRE LENGTH IMPERIAL:
- -
- RIDING STYLE:
- OFF-ROAD
- UNITS:
- PAIR
- WIRE LENGTH:
- -
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- WIRE DIAMETER:
- 10.4 MM
- COLOR/FINISH:
- RED
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
$98.95Qty in Cart: 0Quantity:Price:$98.95Subtotal: -
SUMAX 10.4 mm Spark Plug Wire - Blue 40638
SUMAX
$98.95Upgrading to larger-diameter spark plug wires improves heat dissipation and reduces electromagnetic interference, delivering cleaner ignition signals to your engine. The SUMAX 10.4mm design maintains the proven reliability of SUMAX's 8mm line while...21040315- SKU:
- 21040315
- Availability:
- Ships Same Business Day
- Weight:
- 1.05 LBS
- COLOR/FINISH:
- BLUE
- RIDING STYLE:
- OFF-ROAD
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
- MODEL:
- 409 PRO RACE
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- WIRE LENGTH IMPERIAL:
- -
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- ATV
- RIDING STYLE:
- STREET
- WIRE DIAMETER:
- 10.4 MM
- WIRE LENGTH:
- -
$98.95 -
SUMAX Spark Plug Wire - 8 mm - Black 30038
SUMAX
$72.95Spark plug wires are a critical ignition component that directly impact engine reliability and performance—worn or low-quality wires introduce resistance, heat buildup, and misfires that compromise throttle response and fuel economy. SUMAX's 8mm...21040355- SKU:
- 21040355
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- WIRE DIAMETER:
- 8 MM
- COLOR/FINISH:
- BLACK
- PRODUCT NAME:
- SPARK PLUG WIRE
- RIDING STYLE:
- STREET
- MATERIAL:
- SILICONE
- UNITS:
- PAIR
$72.95Qty in Cart: 0Quantity:Price:$72.95Subtotal: -
SUMAX Spark Plug Wires - 10.4 mm - Black 49038
SUMAX
$98.95Spark plug wires are often overlooked until they fail—and when they do, you're looking at misfires, fouled plugs, and lost horsepower. SUMAX's Spiro-Pro core design delivers 10 times the conductivity of standard carbon-core wires, keeping resistance low...21040364- SKU:
- 21040364
- Availability:
- Ships Same Business Day
- Weight:
- 0.50 LBS
- COLOR/FINISH:
- BLACK
- MATERIAL:
- SILICONE
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- WIRE DIAMETER:
- 10.4 MM
- PRODUCT NAME:
- SPARK PLUG WIRE
$98.95 -
SUMAX Spark Plug Wires - 10.4 mm - Red 49238
SUMAX
$98.95Spark plug wires are often overlooked, but they're critical to consistent ignition timing and engine reliability. SUMAX's 10.4mm wires eliminate weak connections and voltage loss that plague carbon-core alternatives, meaning sharper throttle response and...21040365- SKU:
- 21040365
- Availability:
- Ships Same Business Day
- Weight:
- 0.75 LBS
- MATERIAL:
- SILICONE
- UNITS:
- PAIR
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- WIRE DIAMETER:
- 10.4 MM
- PRODUCT NAME:
- SPARK PLUG WIRE
$98.95Qty in Cart: 0Quantity:Price:$98.95Subtotal: -
SUMAX Spark Plug Wires - 10.4 mm - Blue 49638
SUMAX
$98.95Spark plug wires are the critical link between your ignition system and combustion chamber—a weak connection means misfires, fouled plugs, and lost horsepower. SUMAX's Spiro-Pro core delivers up to 10 times the conductivity of standard carbon-core...21040366- SKU:
- 21040366
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- RIDING STYLE:
- STREET
- COLOR/FINISH:
- BLUE
- MATERIAL:
- SILICONE
- UNITS:
- PAIR
- PRODUCT NAME:
- SPARK PLUG WIRE
- WIRE DIAMETER:
- 10.4 MM
$98.95Qty in Cart: 0Quantity:Price:$98.95Subtotal: -
SUMAX Spark Plug Wires - Black 20034
SUMAX
$41.95Stock spark plug wires degrade under heat and age, causing misfires, poor fuel economy, and reduced ignition performance. SUMAX Spiro-Pro wires deliver superior conductivity and thermal stability, keeping your ignition system firing reliably lap after...21040069- SKU:
- 21040069
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- STREET
- RIDING STYLE:
- UTV
- WIRE DIAMETER:
- 8 MM
- WIRE LENGTH IMPERIAL:
- 21'
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- COLOR/FINISH:
- BLACK
- CONNECTOR ANGLE:
- STRAIGHT
- UNITS:
- PAIR
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$41.95 -
SUMAX Spark Plug Wires - Red 20234
SUMAX
$41.95Stock spark plug wires are a weak link in any ignition system—high resistance causes misfires, heat degradation, and premature failure. SUMAX Spark Plug Wires upgrade your ignition reliability with a Spiro-Pro core that delivers up to 10 times the...21040071- SKU:
- 21040071
- Availability:
- Ships Same Business Day
- Weight:
- 0.32 LBS
- CONNECTOR ANGLE:
- -
- WIRE DIAMETER:
- 8 MM
- RIDING STYLE:
- SNOW
- RIDING STYLE:
- UTV
- RIDING STYLE:
- WATERCRAFT
- TYPE:
- SPARK PLUG
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- ADVENTURE TOURING / DUAL-SPORT
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- WIRE LENGTH IMPERIAL:
- 21'
- RIDING STYLE:
- ATV
- RIDING STYLE:
- OFF-ROAD
$41.95Qty in Cart: 0Quantity:Price:$41.95Subtotal: -
SUMAX 10.4 mm Spark Plug Wire - Black - '99-'08 FL 40034
SUMAX
$59.95Proper ignition timing depends on reliable spark plug wires that transmit voltage without loss or interference. SUMAX 10.4mm wires deliver consistent spark delivery while giving your engine bay that purposeful, professional appearance. Built to OEM...21040093- SKU:
- 21040093
- Availability:
- Ships Same Business Day
- Weight:
- 0.45 LBS
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- WIRE LENGTH:
- 94 CM (37')
- WIRE LENGTH IMPERIAL:
- 19'
- TYPE:
- SPARK PLUG
- WIRE DIAMETER:
- 10.4 MM
- WIRE LENGTH IMPERIAL:
- 37'
- MODEL:
- 409 PRO RACE
- PRODUCT NAME:
- WIRE
- WIRE LENGTH:
- 48,5 CM (19')
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal: -
SUMAX 10.4 mm Spark Plug Wire - Black - '99-'08 Red 40234
SUMAX
$59.95Reliable spark plug wires are non-negotiable for consistent ignition timing and engine performance. SUMAX's 10.4mm wires deliver the same dependable spark delivery as their 8mm counterparts while offering a more aggressive aesthetic—ideal if you're...21040094- SKU:
- 21040094
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- MODEL:
- 409 PRO RACE
- PRODUCT NAME:
- WIRE
- WIRE DIAMETER:
- 10.4 MM
- WIRE LENGTH:
- 48,5 CM (19')
- TYPE:
- SPARK PLUG
- WIRE LENGTH IMPERIAL:
- 37'
- UNITS:
- PAIR
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- WIRE LENGTH:
- 94 CM (37')
- WIRE LENGTH IMPERIAL:
- 19'
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal: -
SUMAX 10.4 mm Spark Plug Wire - Black - '99-'08 Blue 40634
SUMAX
$59.95Reliable spark plug wires are critical to maintaining consistent ignition timing and engine performance, especially in high-demand driving conditions. SUMAX's 10.4mm wire construction delivers the same proven durability as their 8mm counterparts while...21040095- SKU:
- 21040095
- Availability:
- Ships Same Business Day
- Weight:
- 0.46 LBS
- PRODUCT NAME:
- WIRE
- WIRE DIAMETER:
- 10.4 MM
- WIRE LENGTH:
- 48,5 CM (19')
- COLOR/FINISH:
- BLUE
- UNITS:
- PAIR
- MODEL:
- 409 PRO RACE
- TYPE:
- SPARK PLUG
- RIDING STYLE:
- STREET
- WIRE LENGTH:
- 94 CM (37')
- WIRE LENGTH IMPERIAL:
- 19'
- WIRE LENGTH IMPERIAL:
- 37'
$59.95 -
SUMAX 10.4 mm Spark Plug Wire - Red - '09-'16 FL 40236
SUMAX
$59.95Spark plug wires are often overlooked, but they're critical to reliable ignition timing and engine performance—especially on high-output builds where weak signals lead to misfires and lost horsepower. SUMAX's 10.4mm wires deliver the same proven...21040223- SKU:
- 21040223
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- MODEL:
- 409 PRO RACE
- WIRE LENGTH:
- 58,5 CM (23')
- COLOR/FINISH:
- RED
- PRODUCT NAME:
- WIRE
- WIRE DIAMETER:
- 10.4 MM
- WIRE LENGTH IMPERIAL:
- 23'
- RIDING STYLE:
- STREET
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
$59.95 -
SUMAX 10.4 mm Spark Plug Wire - Blue - '09-'16 FL 40636
SUMAX
$59.95Spark plug wires are a critical ignition component—corroded or degraded wires rob your engine of reliable spark delivery and can cause misfires, rough idle, and lost power. The SUMAX 10.4 mm wires deliver consistent, high-voltage spark transfer with a...21040224- SKU:
- 21040224
- Availability:
- Ships Same Business Day
- Weight:
- 0.70 LBS
- MODEL:
- 409 PRO RACE
- WIRE LENGTH:
- 58,5 CM (23')
- COLOR/FINISH:
- BLUE
- WIRE LENGTH IMPERIAL:
- 23'
- PRODUCT NAME:
- WIRE
- WIRE DIAMETER:
- 10.4 MM
- RIDING STYLE:
- STREET
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
$59.95Qty in Cart: 0Quantity:Price:$59.95Subtotal: -
SUMAX Spark Plug Wires - Black - FXCW 20035
SUMAX
$41.95Factory spark plug wires degrade under heat and high RPM conditions, causing misfires, reduced fuel efficiency, and ignition system strain. SUMAX Spark Plug Wires deliver superior conductivity and thermal resistance to keep your ignition system...21040152- SKU:
- 21040152
- Availability:
- Ships Same Business Day
- Weight:
- 0.26 LBS
- PRODUCT NAME:
- WIRE
- TYPE:
- SPARK PLUG
- COLOR/FINISH:
- BLACK
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
- WIRE LENGTH IMPERIAL:
- 8'
- CONNECTOR ANGLE:
- -
- WIRE DIAMETER:
- 8 MM
$41.95 -
SUMAX Spark Plug Wires - Black - FL 20036
SUMAX
$41.95Stock spark plug wires are a bottleneck for ignition performance—they introduce resistance that limits conductivity, generates heat, and fails prematurely. SUMAX Spiro-Pro wires eliminate that weak link with a core that delivers up to 10 times the...21040155- SKU:
- 21040155
- Availability:
- Ships Same Business Day
- Weight:
- 0.40 LBS
- CONNECTOR ANGLE:
- -
- WIRE DIAMETER:
- 8 MM
- PRODUCT NAME:
- WIRE
- RIDING STYLE:
- STREET
- WIRE LENGTH IMPERIAL:
- 17'
- COLOR/FINISH:
- BLACK
- TYPE:
- SPARK PLUG
- UNITS:
- PAIR
$41.95 -
SUMAX Spark Plug Wires - Red - FL 20236
SUMAX
$41.95Stock spark plug wires generate excessive heat and resistance, causing misfires, fouled plugs, and accelerated degradation—especially in high-performance applications. SUMAX Spark Plug Wires eliminate these issues with a Spiro-Pro core that delivers up...21040157- SKU:
- 21040157
- Availability:
- Ships Same Business Day
- Weight:
- 0.41 LBS
- PRODUCT NAME:
- WIRE
- CONNECTOR ANGLE:
- -
- WIRE DIAMETER:
- 8 MM
- TYPE:
- SPARK PLUG
- WIRE LENGTH IMPERIAL:
- 17'
- COLOR/FINISH:
- RED
- RIDING STYLE:
- STREET
- UNITS:
- PAIR
$41.95Qty in Cart: 0Quantity:Price:$41.95Subtotal:
