What happens if I use the wrong type of spark plug wire?

Using the wrong wire can cause real problems. If you use copper core wires with a modern electronic ignition, the Radio Frequency Interference (RFI) they produce can interfere with your ignition's brain, causing poor performance or misfires. Conversely, using suppressor core wires on a vintage magneto ignition can result in a weaker spark, making the bike harder to start and run properly.

How do I know if I need 7mm or 8mm wires?

The size (7mm vs. 8mm) generally corresponds to the core type (copper vs. suppressor). The most important factor is choosing the correct core type for your ignition. If you have points or a magneto, choose 7mm copper core. If you have any type of electronic ignition, choose 8mm suppressor core.

Is making my own spark plug wires difficult?

Not at all! It's a very straightforward process. A universal spark plug wire kit includes the wire, terminals, and boots. You simply route the wire, cut it to the perfect length, strip a small amount of insulation, and crimp the terminal on. It's a skill that allows for a perfectly clean, custom fit every time.

Black Motorcycle Spark Plug Wires

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8mm Suppression Core Cloth Spark Plug Wire Sets - Black with Red tracers — Lowbrow Customs 8mm Cloth 90 Degree Spark Plug Wire Sets - Black with Red tracers
30 reviews $31.19

Lowbrow Customs 8mm Cloth 90 Degree Spark Plug Wire Sets - Black with Orange Tracers
43 reviews $31.19

Lowbrow Customs 7mm Cloth 90 Degree Spark Plug Wire Sets - Black w/ Orange Tracers
6 reviews $25.99

Cycle Standard Vintage Style Rajah Terminals for Custom Spark Plug Wires
6 reviews $15.97

Lowbrow Customs 7mm Cloth 90 Degree Spark Plug Wire Sets - Satin Black
5 reviews $25.99

Cycle Standard Lucas Non-Resistor Type Spark Plug Cap
$10.23

Lowbrow Customs 8mm Cloth Straight Spark Plug Wire Sets - Black with Red tracers
3 reviews $31.19

Cycle Standard Spark Plug Boots and Terminals - 90 Degree Boots - For 8mm Plug Wire — Cycle Standard Spark Plug Boots and Terminals - 90 Degree Boots - For 7mm or 8mm Plug Wire
17 reviews $9.82

Lowbrow Customs 7mm Cloth 90 Degree Spark Plug Wire Sets - Black w/ Red Tracers
4 reviews $25.99

Cycle Standard Magneto or Coil Rubber Boots - Set of 6 - For 7mm or 8mm Plug Wire
8 reviews $12.00

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1989-1999 Harley-Davidson FXST/FLST 1991-1998 FXD
$22.99

Lowbrow Customs 8mm Cloth Straight Spark Plug Wire Sets - Black with Orange Tracers
2 reviews $31.19

Cycle Standrad Spark Plug Boots and Terminals - Straight Style - 7mm or 8mm — Cycle Standard Spark Plug Boots and Terminals - Straight Style - for 7mm or 8mm Spark Plug Wire
12 reviews $21.13

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1999-2017 Harley-Davidson FXD 2000-2017 FXST/FXST
$22.99

Drag Specialties 8.8 mm Spark Plug Wire Set - Universal
5 reviews $34.27

Cycle Standard Spark Plug Wire Separators - Black
$13.95 $19.23

Cycle Standard Lucas 5K Resisitor Type Spark Plug Cap
$10.28

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1986-2003 Harley-Davidson XL 1980-1989 FLH/FLT
$22.99

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 1982-1994 Harley-Davidson FXR
$22.99

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 2004-2006 Harley-Davidson XL 1999-2008 FLH/FLT
$18.39 $22.99

Lowbrow Customs Lowbrow Customs Spark Plug Wire Set 2007-2021 Harley-Davidson XL 1999-2006 FLH/FLT
$22.99

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