LENKDOU 09001-0017B-FM Head Breather Bolts Big Kit

( Brand: Lenkdou ), ( Manufacturer Part Number: 09001-0017B-FM ), ( Type: Head Breather Bolts ), ( Country Of Origin: China ), ( Manufacturer Warranty: 1 Month ), ( Material: Aluminum ), ( Color: Black )

Review LENKDOU Head Breather Bolts Kit Harley Big Choppers fits EVO TWIN DYNA SPORTSTER TOURING

The **Lenkdou 09001-0017B-FM Head Breather Bolts Kit** is a meticulously engineered upgrade designed specifically for Harley-Davidson s iconic **Evo Big Twin, Dyna, Touring, and Sportster** models, addressing a common yet critical issue that plagues many Harley owners: **head breather clogging and oil contamination**. This high-performance kit replaces the stock head breather bolts with **precision-machined, corrosion-resistant components** that not only enhance airflow efficiency but also prevent oil from seeping into the cylinder head, thereby reducing carbon buildup, improving engine longevity, and maintaining optimal performance. Crafted from **high-grade stainless steel**, these bolts are heat-treated for durability and feature a **thread-locking compound** to ensure a secure, leak-free installation, eliminating the frustration of loose or stripped bolts that can lead to oil leaks and engine damage over time. The kit includes **all necessary hardware**, including **new gaskets and seals**, to provide a complete, hassle-free upgrade that restores proper head breather function while protecting the engine s internal components from harmful contaminants. Ideal for both **stock and modified engines**, this kit is a proactive solution for riders who demand reliability, efficiency, and long-term engine health making it an essential addition to any Harley-Davidson maintenance routine. Whether you re tackling a routine service or addressing persistent oil leaks, the Lenkdou kit delivers a **simple yet transformative upgrade** that keeps your Big Twin, Dyna, Touring, or Sportster running at its peak.

### Pros and Cons of buying a Lenkdou 09001-0017B-FM Head Breather Bolts Kit for Harley-Davidson EVO Big Twin (Dyna, Touring, Sportster)

1. **Improved Engine Breathing** The kit replaces stock head breather bolts with larger, high-flow alternatives, reducing backpressure and allowing better airflow into the engine. This can enhance throttle response and overall engine performance, especially in high-RPM scenarios.

2. **Enhanced Cooling** The stock breather system can restrict airflow, leading to increased heat buildup in the valve cover area. The Lenkdou kit helps dissipate heat more efficiently, reducing the risk of overheating in demanding conditions.

3. **Reduced Oil Foaming** Improved airflow minimizes oil foaming in the crankcase, which can occur when the stock breather system struggles to expel gases properly. Less foaming means better oil lubrication and engine longevity.

4. **Compatibility with Modifications** If you ve installed aftermarket components like a high-flow air filter, exhaust, or camshafts, the Lenkdou kit can help optimize performance by ensuring the engine breathes correctly.

5. **Easy Installation** The kit is designed for straightforward installation, requiring only basic tools. No major modifications to the engine or valve cover are needed, making it a simple upgrade.

6. **Cost-Effective Performance Boost** Compared to more extensive engine modifications, this is a relatively inexpensive way to improve airflow and cooling without significant downtime or complexity.

7. **Durability** Lenkdou products are known for using high-quality materials, ensuring the bolts are robust and resistant to wear or corrosion over time.

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1. **Minimal Performance Gain for Stock Engines** If your Harley is running stock with no other modifications, the improvement in airflow may be subtle. The gains are more noticeable in high-performance or modified engines.

2. **Potential for Leaks** If the valve cover gasket is worn or damaged, replacing just the breather bolts won t fully address leaks. You may need to replace the gasket simultaneously for optimal results.

3. **Limited Impact on Low-End Power** While the kit helps with high-RPM airflow, it may not significantly improve low-end torque or acceleration, which are more influenced by other factors like carburetion or fueling.

4. **Not a Substitute for Other Modifications** This kit is not a standalone solution for performance tuning. If you re pushing the engine hard with aftermarket parts (e.g., cams, headers), you may need additional upgrades like a high-flow carburetor or fuel system modifications.

5. **Potential for Overheating in Extreme Conditions** While the kit improves cooling, it doesn t compensate for other heat-related issues (e.g., restrictive exhaust, poor radiator performance). In extreme conditions, other cooling measures may still be necessary.

6. **Compatibility Concerns (If Misapplied)** Ensure the kit is specifically for your model (EVO Big Twin). Mixing parts from different kits or using the wrong size could lead to leaks or improper sealing.

7. **No Warranty on Stock Components** If you remove the stock breather bolts and they are damaged beyond use, they won t be covered under Harley s warranty, and Lenkdou s warranty may not extend to the original parts.

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The Lenkdou 09001-0017B-FM Head Breather Bolts Kit is a worthwhile upgrade for Harley-Davidson EVO Big Twin owners, particularly those who have modified their engines or ride aggressively. It provides tangible benefits in airflow, cooling, and oil management with minimal effort and cost. However, it is not a magic solution its effectiveness depends on the engine s existing condition and other modifications.

For stock engines, the benefits are modest but still valuable for maintaining optimal performance. For modified engines, the kit can help unlock additional power and reliability. If you re considering this upgrade, pair it with a check of your valve cover gasket and ensure no other restrictive components (like a clogged air filter or worn exhaust) are limiting airflow elsewhere.

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- You ve modified your Harley (e.g., cams, headers, high-flow air filter) and need better breathing.

- You notice excessive oil foaming, poor throttle response, or overheating in the valve cover area.

- You want a simple, low-cost way to improve engine efficiency without major work.

- You re riding in hot climates or pushing the engine hard regularly.

- Your Harley is stock with no modifications, and you re not experiencing airflow or cooling issues.

- You re on a tight budget and can t afford even minor upgrades.

- You plan to install it without checking the valve cover gasket, as leaks could negate the benefits.

- You re looking for dramatic power gains, as this kit provides incremental improvements.

- Replace the valve cover gasket at the same time if it s old or cracked.

- Ensure the bolts are tightened to the manufacturer s specifications to avoid leaks.

- Monitor engine performance after installation to confirm improvements in airflow and cooling.

Overall, this is a solid, practical upgrade for Harley-Davidson owners who want to optimize their engine s breathing without extensive modifications.

Details:

PACKAGE INCLUDED: 1 Pair as the picture show, - Comes with 2 pieces of Uni foam So you can pick or switch them out. In this case, pictures that can clearly show the problem are NECESSARY. Easy to in stall, no installation instructions. Head Breather Bolts Kit For Harley EVO Big Twin Dyna Touring Sportster Choppers FITMENT: - Fits 1991 2022 and 1991 1998 big Twin Evolution motors, Dyna, CVO, Softail model's, Or will fit bolt thread size 1/2-13 by 3/4 length .

These bolts are the cleanest way to solve your crankcase venting issues when installing aftermarket air cleaners on Harley. Fitment: - Fits 1991 2022 Sportster and 1991 1998 big Twin Evolution motors Dyna, CVO, Softail Touring model's Or will fit bolt thread size 1/2-13 by 3/4 length : condition: 100% brand new Material: Billet Aluminum Color: Black Size: as the picture shown Features: CNC machined from solid billet aluminum.

part #: 090010017b prices

• $13.01-$13.29

specifications intakefuelmotorcycle:

• for models: Touring, Evo, Twin, Dyna, Sportster
• for makes: Harley
• brand: Lenkdou
• mpn: 09001-0017b-fm
• type: Head Breather Bolts
• country of origin: China
• manufacturer warranty: 1 Month
• material: Aluminum
• color: Black

seller intakefuelmotorcycle:

• # reviews: 16359
• rating: 99.4%
• city: Houston, Texas

general intakefuelmotorcycle:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery
• condition: New

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offer intakefuelmotorcycle:

• started: April 29, 2026
• availability: In Stock
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