Motorcycle Spark Plug Wire FAQs (2024)

  1. Recommended 91 octane (95 RON) or higher fuel (R+M)/2.

  2. Values shown are nominal. Performance may vary by country and region.

  3. Standard and optional fuel systems may vary by country.

  4. See motorcycle owner’s manual for complete details.

  5. Estimated from fuel economy tests on a sample motorcycle from the corresponding family conducted by Harley-Davidson under ideal laboratory conditions. Not all motorcycle models undergo fuel economy testing. Fuel economy and mileage may vary among motorcycle models within a family. Your mileage may vary depending on your personal riding habits, weather conditions, trip length, vehicle condition and vehicle configuration and other conditions. Break-in mileage may vary.

  6. Prices listed are the Manufacturer’s Suggested Retail Prices for base models. Options such as color are available at additional cost. Prices exclude tax, title, licensing, registration fees, destination charges, surcharges (attributable to raw materials costs in the product supply chain), added accessories, and additional dealer charges, if any, and are subject to change. Harley-Davidson reimburses dealers for performing manufacturer-specified pre-delivery inspection and setup tasks. Dealer prices may vary.

  7. Measurement reflects 180 lb. (81.7 kg) operator weight.

  8. North America security system includes immobilizer; outside North America the security system includes immobilizer and siren.

  9. Standard and optional wheels may vary by country and region.

  10. Financing Offer available only on new Harley‑Davidson®motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. 6.39% APR offer is available on new Harley‑Davidson® motorcycles to high credit tier customers at ESB and only for up to a 60 month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Road Glide® Limited motorcycle in Vivid Black with an MSRP of $29,399, no down payment and amount financed of $29,399, 60 month repayment term, and 6.39% APR results in monthly payments of $573.71. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley‑Davidson® Dealership for details.

  11. Financing Offer available for Used Harley‑Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. 7.79% APR offer is available on Used Harley‑Davidson® motorcycles to high credit tier customers at ESB and only for up to a 60 month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2015 Softail® Deluxe model in Vivid Black with a sale price of $17,845, no down payment and amount financed of $17,845, 60 month repayment term, and 7.79% APR results in monthly payments of $360.04 In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley‑Davidson® Dealership for details.

  12. $0 Down and as Low as 3.99% APR
    *Financing Offer available only on select, untitled 2022 and 2023 Harley-Davidson® Grand American Touring and Adventure Touring motorcycles financed through Eaglemark Savings Bank and is subject to credit approval. Touring models Road King® Special, Road Glide®, Street Glide® and Electra Glide® Highway King are excluded. Harley-Davidson® Anniversary, CVO, Trike and Icons Motorcycle Collection are excluded. Not all applicants will qualify as the Annual Percentage Rate (APR) will vary based on the applicant’s past credit performance and the term of the loan. Financing offer is available only for up to a 48-month term. For example, a 2023 Street Glide® Special motorcycle in Bright Billiard Blue/Billiard Gray with Chrome Finish an MSRP of $29,499, no down payment and amount financed of $29,499, 48-month repayment term, and 3.99% APR results in monthly payments of $665.93. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Customer must take delivery by December 31, 2024. This Financing Offer is valid during the period of July 1, 2024, to December 31, 2024. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at anytime. See your Harley-Davidson® Dealership for details.​

    CUSTOMIZATION CREDIT
    **$1,000 incentive valid for in-dealership purchase of Genuine Harley-Davidson® Parts & Accessories and/or Apparel & Licensed merchandise in connection with the purchase of select Grand American Touring Motorcycles valid at participating Harley-Davidson® dealerships within the U.S. including Alaska and Hawaii. Offer valid toward the purchase of select new, untitled 2022 or 2023 Harley-Davidson® Grand American Touring motorcycles available and in stock at participating H-D® dealers between July 1, 2024 and December 31, 2024.Offer may not be available in all states. Touring models Road King® Special, Road Glide®, Street Glide® and Electra Glide® Highway King are excluded. Harley-Davidson® Anniversary, CVO, Trike, Icons Motorcycle Collection and Police Duty Motorcycles are excluded. Offer cannot be redeemed for cash or cash equivalent. Offer is subject to change at any time without notice. Void where prohibited or restricted by law. Dealer participation may vary. Additional restrictions apply, see your Harley-Davidson® Dealership for details.​

  13. Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 11.84% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to an 84-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2024 Pan America® 1250 Special motorcycle in Billiard Gray with an MSRP of $19,999, 10% down payment and amount financed of $17,999.10, 84-month repayment term, and 11.84% APR results in monthly payments of $316.20. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

  14. Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 12.74% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to a 96-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2024 Street Glide® motorcycle in Billiard Gray with an MSRP of $25,999, 10% down payment and amount financed of $23,399.10, 96-month repayment term, and 12.74% APR results in monthly payments of $389.88. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

  15. Prices listed are the Manufacturer’s Suggested Retail Prices(MSRP).MSRP excludes tax, title, licensing, registration fees, destination charges (including freight, handling and processing), surcharges (attributable to raw materials cost in the product supply chain), dealer-added accessories and installation, and additional dealer charges, if any. Harley-Davidson charges dealers for destination charges (including freight, handling and processing) and may make a profit on those charges.Harley-Davidson reimburses dealers for performing manufacturer-specified pre-delivery inspection and setup tasks. Dealer prices may vary.

  16. Financing Offer available only on new Harley‑Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. 6.59% APR offer is available only to high credit tier customers who have completed a Riding Academy, Skilled Riders, MSF or other state accredited course within 180 days of application date and only for up to a 60 month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Heritage Classic 114 in Vivid Black with an MSRP of $21,199, 10% down payment and amount financed of $19,079.10, 60 month repayment term, and 6.59% APR results in monthly payments of $374.11. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at anytime. See your Harley-Davidson® Dealership for details.

  17. Financing Offer available only on used Harley‑Davidson motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify.9.64% APR offer is available only to high credit tier customers who have completed a Riding Academy, Skilled Riders, MSF or other state accredited course within 180 days of application date and only for up to a 60 month term. The APR may vary based on the applicant's past credit performance and the term of the loan.For example, a 2020 Softail Deluxe model in Vivid Black with a sale price of $18,049, no down payment and amount financed of $18,049, 60 month repayment term, and 9.64% APR results in monthly payments of $380.30.In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at anytime. See your Harley-Davidson®Dealership for details.

  18. Visit H-DVisa.com for details. The creditor and issuer of the Harley‑Davidson®Visa®card is U.S. Bank National Association, pursuant to a license from Visa U.S.A. Inc.

  19. Financing offer available only to Active United States Military personnel and only on Harley‑Davidson® motorcycles financed through Eaglemark Savings Bank and is subject to credit approval. Not all applicants will qualify. No Money Down offer is available only to well-qualified credit tier applicants. 9.14% APR offer is available only to the highest credit tier applicants and only for up to 60 months term. The APR and down payment may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Softail® Standardmotorcycle in Vivid Black with an MSRP of $14,399, no down payment and amount financed of $14,399, 60 month repayment term and 9.14% APR results in monthly payments of $299.88. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions and limitations may apply. Financing offer is subject to change or cancellation at any time. See your Harley‑Davidson® Dealership for details. Active Military includes: United States Army, Navy, Marine, Air Force, Coast Guard, National Guard and Reserves.

  20. *Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 11.74% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to an 84-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Nightster® motorcycle in Vivid Black with an MSRP of $13,499 a 10% down payment and amount financed of $12,149.10, 84-month repayment term, and 11.74% APR results in monthly payments of $212.78. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

  21. *Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 11.74% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to an 84-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Softail® Standard motorcycle in Vivid Black with an MSRP of $14,399, a 10% down payment and amount financed of $12,959.10, 84-month repayment term, and 11.74% APR results in monthly payments of $226.97. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

  22. *Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 12.74% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to an 96-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2023 Street Glide® Standard motorcycle in Vivid Black with an MSRP of $21,999, a 10% down payment and amount financed of $19,799.10, 96-month repayment term, and 12.74% APR results in monthly payments of $329.90. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

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  32. Terms, conditions, and additional fees apply. Motorcycles may be ineligible for return due to excess wear and tear, excessive modifications, or other conditions.

  33. Financing Offer available only on New Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. 8.99% APR offer is available only to high credit tier customers at ESB and only for a 48-month term. The APR may vary based on the applicant s past credit performance and the term of the loan. For example, a 2024 Road Glide® inBilliard Gray with an MSRP of $26,599, 10% down payment and amount financed of $23,939.10, 48-month repayment term, and 8.99% APR results in 47 monthly payments of$326.36 and a 48th balloon payment of$15,810.98. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. This Financing Offer is valid during the period of July 1, 2024 - August 31, 2024. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at anytime.

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  40. H-D H.O.G. Elite Visa® cardmembers who use their card May 1, 2024, through August 31, 2024, (promotion period) to rent a Harley-Davidson motorcycle through EagleRider Rentals & Tours will earn 6 points per $1 of spend in Net Purchases. H-D Visa Signature® cardmembers who use their card May 1, 2024, through August 31, 2024, (promotion period) to rent a Harley-Davidson motorcycle through EagleRider Rentals & Tours will earn 4 points per $1 of spend in Net Purchases.Net Purchases are purchases minus returns and credits. Not all transactions are considered to be Purchases and eligible to earn rewards, such as transactions posting as Convenience Checks; Balance Transfers; Advances (including ATM withdrawals, wire transfers, traveler’s checks, money orders, foreign cash transactions, betting transactions, and lottery tickets); interest charges and fees; credit insurance premiums; and transactions to (i) fund certain prepaid card products, (ii) buy currency from the U.S. Mint, or (iii) buy cash convertible items. U.S. Bank cannot control how merchants choose to classify their business and reserves the right to determine which purchases qualify. Must be booked directly through EagleRider Rentals & Tours rather than a booking site. Genuine Rewards points awarded but not redeemed will expire 3 years from the date the points were awarded on December 31, at 11 p.m. CST, of the expiration year.

    The creditor and issuer of the Harley-Davidson® H.O.G. Elite Visa Signature® card is U.S. Bank National Association, pursuant to a license from Visa U.S.A. Inc.

  41. Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 12.74% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to a 96-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2024 Road Glide® motorcycle in Billiard Gray with an MSRP of $25,999, 10% down payment and amount financed of $23,399.10, 96-month repayment term, and 12.74% APR results in monthly payments of $389.88. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

  42. Financing Offer available only on new Harley-Davidson® motorcycles financed through Eaglemark Savings Bank (ESB) and is subject to credit approval. Not all applicants will qualify. This 11.84% offer is available on new Harley Davidson® motorcycles to high credit tier customers at ESB and only for up to an 84-month term. The APR may vary based on the applicant’s past credit performance and the term of the loan. For example, a 2024 Nightster® motorcycle in Billiard Gray with an MSRP of $11,999, 10% down payment and amount financed of $10,799.10, 84-month repayment term, and 11.84% APR results in monthly payments of $189.14. In this example, customer is responsible for applicable taxes, title, licensing fees and any other fees or charges at the time of sale. APR is calculated according to the simple interest method. Not valid in conjunction with other offers. Other terms, conditions, and limitations may apply. Dealer participation may vary. Financing offer is subject to change or cancellation at any time. See your Harley-Davidson® Dealership for details.

Motorcycle Spark Plug Wire FAQs (2024)

FAQs

Does upgrading spark plug wires improve performance? ›

The short answer is Yes, when you replace the spark plugs and wires can increase your vehicle's performance.

Do thicker spark plug wires make a difference? ›

When it comes to spark plug or coil wires, it depends on the application's intended purpose, they really can have an effect on ignition performance. Companies offer 7,8,8.8 and 10-mm thicknesses for wires, however, the inner core is the same on each diameter regardless, so performance doesn't actually change.

Does it matter which wire goes to which spark plug? ›

What is even more imperative than matching cable length is that you do not mix up the order of the spark plug wires. Improper installation of these wires can result in poor combustion or misfiring of the cylinder, which will cause drivability issues and potentially severe damage to the engine.

Can spark plug wires increase horsepower? ›

While spark plug wires may not “make” horsepower in the traditional sense of adding a performance part to your engine, they can certainly help create the strongest, hottest spark for your combustion chamber, which aids in helping all your other performance engine upgrades like heads, cam, and carburetor to make the ...

When changing spark plugs should you change the wires as well? ›

Yes, spark plug and plug wires are generally replaced as a set. Spark plug electrodes burn away due to continuously sparking to aid combustion and spark plug wires deteriorate due to continuously getting heated by engine heat and develop cracks due to engine vibrations.

Does changing spark plug wires make a difference? ›

Benefits of Replacing Spark Plugs & Wires

New spark plugs help to ensure that each cylinder is firing correctly, while new wires help to prevent interference from other electrical components. Fully operational spark plugs will provide a completely operational combustion process.

Is higher or lower ohms better for spark plug wires? ›

The higher voltage of a coil on plug or distributor system can create enough voltage that a slightly higher resistance wire will not greatly affect spark strength, but the relatively lower output of a magneto means using a lower resistance wire is more important to ensure a hot spark from the spark plug.

What is the best size for spark plug wires? ›

Size is perhaps the last thing to consider when it comes to spark plug wires. Most manufacturers recommend an 8 or 8.5mm plug wire on most applications. Exceptions would be an all-out race car or a street rod where EMI/RFI suppression is not a concern, but weight and appearance are.

Are NGK spark plug wires better? ›

Providing superior quality, noise suppression, durability and conductivity, NGK wire sets cover more than 98% of vehicles on the road today.

Does the length of spark plug wires matter? ›

No, the length of sparkplug wire does not matter. However, The engine will not operate properly without the proper thread reach. If a spark plug with the wrong thread length is erroneously used, the piston or valve could strike it and damage the engine.

What are the symptoms of a bad spark plug wire? ›

The most obvious sign of faulty spark plug wires is your vehicle just feels a little 'off. ' It would probably start slowly with reduced gas mileage but could progress to no acceleration. Faulty spark plug wires or spark plug misfires can also cause problems starting your engine, a rough idle, and loss of power.

How do I know if my spark plug wires are good? ›

Inspect the wires and clips

Clean each wire with a cloth and then look for physical damage like cuts and scorch marks on the wires or boots, carefully examine the insulation around the wire and look for corrosion between the boot (the end of the spark plug wire), the spark plug and coil.

Are MSD spark plug wires worth it? ›

These are an excellent replacement for the price. My factory wires had 141,000 miles on them and they still were ok, but I figured since it was time top change the spark plugs I'd upgrade the wires. From what I read on blogs and in reviews these aren't your typical parts store cheap wires that tend to arc.

Are ceramic spark plug wires better? ›

As the name implies, the Extreme 9000 Series ceramic boot spark plug wires ditch the traditional silicon boot in favor of one made from ceramic, a material that's far more resistant to thermal damage, which in turn yields a thermal rating of up to 2000 degrees for these plug boots.

Is iridium better than double platinum? ›

Iridium Spark Plugs Can Handle High Engine Temperatures

Iridium is even stronger than platinum. It shares the same benefits over copper as platinum, but it is said to be eight times stronger than platinum, and it has a higher melting point so it can handle the hottest, highest-performing engines.

Will new spark plugs and wires improve mpg? ›

Replace spark plugs

Worn spark plugs can reduce gas mileage by 30%. Manufacturers build spark plugs to last about 100,000 miles. However, it's common for wear to show much sooner. It's wise to replace spark plugs early, between 30,000 and 60,000 miles.

Do upgraded spark plugs make more power? ›

Installing high-performance spark plugs can smooth out a rough idle and get your motor purring immediately. Pulstar spark plugs can give your engine more power, a quicker throttle response, and a more stable, longer-lived engine.

What does spark plug upgrade do? ›

Upgraded spark plugs are engineered to offer consistent performance across various operating conditions. This stability ensures reliable ignition, even in extreme temperatures or high-stress situations, resulting in a smoother and more reliable driving experience.

What do new spark plugs improve? ›

The greatest benefit of changing your spark plugs is that your engine will run better, provide you with improved gas mileage, and may reduce the pollution from the vehicle. It is a reasonable cost to replace the spark plugs, as well.

References

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