1. Motorcycle Spark Plugs For Sale
  2. sku: 13658769710700741
  3. HARLEY DAVIDSON 16725-66A

HARLEY-DAVIDSON 16725-66A Nos Spark Plug Heli Coil Thread Spring

fits make: Harley.

16725-66a Harley-davidson Nos Oem Spark Plug Heli-coil Thread Spring Qty 4

( Brand: Harley-davidson ), ( Manufacturer Part Number: 16725-66A ), ( Part Type: Spark Spring Plug Coil ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Nos Oem Spark Plug Heli coil Thread Spring Qty

Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring

The Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring is a high-quality replacement part designed specifically for Harley-Davidson motorcycles. This essential component ensures the smooth and efficient operation of your motorcycle's ignition system.

Crafted to perfection by Harley-Davidson, this heli-coil thread spring is a direct OEM (Original Equipment Manufacturer) replacement for your existing spark plug spring. It is engineered to withstand the rigorous conditions of high-performance motorcycling, providing reliable performance with every ride.

The NOS (New Old Stock) designation indicates that this part is a brand-new, unused item from the original production batch, making it an ideal choice for those seeking an authentic Harley-Davidson replacement. The spring is meticulously crafted from a durable material that offers excellent resilience and longevity, ensuring consistent spark plug performance.

The Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring is easy to install, thanks to its precise fit and simple design. It is compatible with a variety of Harley-Davidson models, making it a versatile solution for a wide range of motorcycles.

Investing in this Harley-Davidson OEM replacement part not only guarantees the integrity and reliability of your motorcycle's ignition system but also adds a touch of authenticity to your beloved bike. With the Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring, you can enjoy the smooth, powerful performance that Harley-Davidson motorcycles are renowned for.

Analysis of Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring

Pros:

1. Original Equipment Manufacturer (OEM) Part: This part is a direct replacement for the original spark plug heli-coil thread spring used in Harley-Davidson motorcycles. This ensures a perfect fit and compatibility with the engine.

2. High-Quality Material: The heli-coil thread spring is made from a durable material that can withstand the harsh conditions of a motorcycle engine.

3. Restores Functionality: If the original thread in the engine is damaged or worn out, this part can help restore the spark plug's proper seating, improving engine performance and preventing potential issues.

4. No-Spark Gap Issue: The heli-coil thread spring helps maintain the correct spark plug gap, which is crucial for the efficient combustion of fuel and the overall performance of the engine.

Cons:

1. Cost: As an OEM part, this heli-coil thread spring may be more expensive compared to aftermarket alternatives.

2. Availability: Due to its specific application, it may be difficult to find this part in local stores, and shipping times might be longer.

3. Installation Complexity: Installing a heli-coil thread spring can be a challenging task, especially for those without mechanical experience. It requires the removal of the spark plug and possibly the cylinder head, which can be time-consuming and potentially damage the engine if not done correctly.

4. Potential Overkill: If the engine has no significant issues, replacing the spark plug heli-coil thread spring might seem unnecessary, leading to excess spending.

Conclusion:

The Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring is a high-quality OEM part that can help restore functionality and improve engine performance. However, it is more expensive and may be challenging to install. If you have a Harley-Davidson motorcycle with a damaged thread or a spark plug gap issue, it would be beneficial to invest in this part. If your engine is functioning well, it might be worth considering aftermarket alternatives or delaying the replacement until it's necessary.

Recommendation:

If you're comfortable with the installation process or have access to a professional mechanic, the Harley-Davidson 16725-66A NOS Spark Plug Heli-Coil Thread Spring is a reliable choice for maintaining or improving your motorcycle's performance. If budget or installation complexity is a concern, consider researching aftermarket alternatives or consulting with a mechanic before making a purchasing decision.

Details:

Dead Parts MC Patch: parts patch. Four NOS Harley #16725-66A thread springs. Code: CC12032025. Your patience is appreciated.

part #: 1672566a prices

  • $9.99-$20.00

specifications cyclesparkplugs:

  • for makes: Harley
  • brand: Harley-davidson
  • mpn: 16725-66a
  • part type: Spark Spring Plug Coil
  • country of origin: United States

offer cyclesparkplugs:

  • quantity: 1
  • options: Ship-to-home
  • sold: 0
  • started: December 3, 2025
  • availability: In Stock

general cyclesparkplugs:

  • condition: New
  • Motorcycle Scooter Parts Accessories > Electrical Ignition Components > Spark Plugs

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  • wallet: Paypal
  • other
  • credit card: Diners-club

returns cyclesparkplugs:

  • policy: Returns Accepted
  • time: 30 Days
  • paid by: Seller

seller cyclesparkplugs:

  • rating: 99.8%
  • city: Danbury, North Carolina
  • # reviews: 39275

shipping cyclesparkplugs:

  • type: Fixed
  • class: Standard
  • carrier: USPS
  • cost: $0.00
  • service: USPS Ground Advantage
  • transit: 3-7 Days
for makes: harley, part type: spark spring plug coil, country of origin: united states,
category: motorcycle parts > motorcycle scooter parts accessories > electrical ignition components > spark plugs, sku: 13658769710700741,
Harley-davidson 16725-66A Is Similar To:
cyclesparkplugs logo
3 offers $9.99–$20.00 USD
  • New. Offer #1 priced at $15.84 + $0.00 shipping estimate = $15.84* total. Code: CC12032025 Four NOS Harley # thread springs.FREE SHIPPING
  • New other (see details). Offer #2 priced at $9.99 + $7.25 shipping estimate = $17.24* total. One (1) new/ NOS Harley Davidson Heli-Coil Insert FL FLH.+$7.25 shipping
  • New. Offer #3 priced at $20.00 + $14.42 shipping estimate = $34.42* total. JUST TO GIVE AN IDEA OF HOW MANY WE ACTUALLY HAVE. DON'T BE AFRAID TO REACH OUT.+$14.42 shipping

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