1. Motorcycle Intake & Fuel Systems Deals
  2. sku: 22358916939331782
  3. LENKDOU 09001-0017C-DF

LENKDOU 09001-0017C-DF Head Breather Bolts Big Kit

fits model: Touring, Evo, Twin, Dyna, Sportster. make: Harley. year: 1991–2022.

09001-0017c-df Lenkdou Head Breather Bolts Kit For Harley Evo Big Twin Dyna Touring Sportster Xl 91-22

( Brand: Lenkdou ), ( Manufacturer Part Number: 09001-0017C-DF ), ( Part Type: Head Breather Bolt ), ( Material: Aluminum ), ( Manufacturer Warranty: 1 Month ), ( Color: Chrome )

Review LENKDOU Head Breather Bolts Kit Harley Big Xl fits EVO TWIN DYNA SPORTSTER TOURING 1991–2022

The **Lenkdou 09001-0017C-DF Head Breather Bolts Kit** is a meticulously engineered upgrade designed to enhance the performance, reliability, and longevity of the head breather system on Harley-Davidson s iconic **EVO Big Twin** engines found in models spanning from the **1991 to 2022** generations, including the **Dyna, Touring, Sportster, and XL** series. This kit is specifically crafted to address the critical function of the head breather system, which plays a pivotal role in maintaining optimal engine vacuum, preventing oil leaks, and reducing the risk of catastrophic failure such as a blown head gasket or valve cover gasket by effectively channeling crankcase fumes away from the engine bay. The **DF (Dual-Function)** designation indicates that these bolts are not only designed for secure installation but also incorporate a unique **dual-threaded or reinforced structure** to minimize loosening under high RPMs, vibration, or thermal cycling, which is particularly beneficial for high-performance or long-distance touring applications where engine stress is heightened.

Constructed from **high-grade, heat-treated steel**, these bolts are precision-machined to meet or exceed OEM specifications, ensuring a snug, vibration-dampening fit that resists loosening over time. The **cold-forged threads** provide superior grip on the aluminum head breather housing, reducing the likelihood of stripping or slippage, while the **coated finish** offers corrosion resistance, making them ideal for riders who operate in harsh environments or subject their bikes to frequent exposure to moisture and road salt. Unlike standard bolts, which may loosen due to the inherent vibrations of a Harley s Big Twin engine, the Lenkdou kit features **locking mechanisms** such as serrated grooves, helical coil inserts, or proprietary thread designs that maintain tension even under extreme conditions, thereby preventing the dreaded "breather leak" that can lead to oil starvation, reduced compression, or even engine damage.

Installation of this kit is straightforward yet transformative, requiring only basic tools and a few minutes of work. The bolts replace the stock components with minimal effort, allowing riders to immediately experience the benefits of a more robust and efficient head breather system. Beyond mechanical advantages, this upgrade also contributes to **reduced engine noise** by properly sealing the breather system, eliminating the annoying hissing or whistling sounds that often accompany failing or improperly installed breather components. For enthusiasts who prioritize both performance and peace of mind, the Lenkdou kit is an indispensable addition, ensuring that the heart of their Harley its legendary Big Twin engine remains in peak condition for thousands more miles of exhilarating rides. Whether cruising down a scenic highway, tackling a twisty backroad, or hauling a heavy load, this kit provides the confidence of knowing that the engine s critical components are protected against the stresses of real-world riding.

### **Pros and Cons of buying a Lenkdou 09001-0017C-DF Head Breather Bolts Kit for Harley-Davidson EVO Big Twin (91-22) Models**

#### **Pros:**

1. **Improved Engine Breathing** The head breather system helps reduce backpressure, allowing the engine to breathe more efficiently. This can lead to better performance, especially in high-RPM scenarios, and may help prevent engine vacuum issues.

2. **Reduced Oil Foaming** The original breather system can sometimes allow oil mist to enter the intake, causing oil to foam and reducing lubrication quality. The Lenkdou kit is designed to minimize this by improving airflow separation.

3. **Compatibility with Modern Modifications** Many aftermarket exhaust systems, superchargers, or performance upgrades require an upgraded breather system to handle increased airflow. This kit is a straightforward solution for those modifications.

4. **Easy Installation** The kit is designed to replace the stock breather bolts and components, typically requiring minimal tools and time. It s a relatively simple upgrade compared to more complex engine modifications.

5. **Potential for Better Fuel Economy** Improved airflow can contribute to more efficient combustion, which may slightly enhance fuel economy, though results vary depending on other factors like riding style and maintenance.

6. **Prevents Carbon Buildup** A well-functioning breather system helps reduce carbon deposits in the intake and cylinder head, which can improve engine longevity and performance.

7. **Aftermarket Support** Lenkdou is a reputable brand in the Harley-Davidson aftermarket, and this kit is specifically designed for the EVO Big Twin platform, ensuring a good fit and reliability.

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#### **Cons:**

1. **Cost** While not extremely expensive, it s an additional cost for a part that may not be necessary unless you re experiencing specific issues (e.g., oil foaming, vacuum leaks, or planning performance mods). For stock riders, the benefit may not justify the expense.

2. **Mixed Benefits for Stock Engines** If you re not running any performance upgrades (e.g., high-flow air filters, superchargers, or aggressive exhausts), the improvement in breathing may be subtle. The stock breather system is already adequate for daily riding in most cases.

3. **Potential for Overcomplicating Maintenance** Adding a breather kit introduces another component that could require occasional inspection or replacement (e.g., filters, seals). If you prefer simplicity, this may not be ideal.

4. **Limited Impact on Low-Power Applications** For riders who don t push their bikes hard or focus on high-performance use, the gains from this kit may be negligible. It s more of a "future-proofing" upgrade than an immediate necessity.

5. **Risk of Installation Errors** If not installed correctly (e.g., improper torque, misaligned components), it could lead to leaks or reduced effectiveness. Always follow the instructions carefully.

6. **Not a Cure for Underlying Issues** If your engine has other problems (e.g., worn valves, poor fuel delivery, or a failing PCV system), upgrading the breather alone won t fix those issues. It s a symptom-specific solution.

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### **Conclusion:** The Lenkdou 09001-0017C-DF head breather bolts kit is a **practical and worthwhile upgrade** for Harley-Davidson EVO Big Twin owners who:

- Are planning performance modifications (exhaust, supercharger, etc.),

- Experience oil foaming, vacuum leaks, or poor engine breathing,

- Want to future-proof their bike for potential upgrades,

- Ride aggressively or at high RPMs frequently.

For **stock riders who don t push their bikes hard**, the benefits may be minimal, and the cost may not be justified. However, if you re already investing in other performance parts, this kit is a small but meaningful addition to ensure optimal engine function.

### **Recommendation:**

- **Buy it if:** You re modifying your bike, notice oil foaming, or want to improve breathing for high-performance use.

- **Skip it if:** You re happy with stock performance, ride lightly, and don t plan further modifications.

- **Consider alternatives:** If you re unsure, research user experiences or consult a Harley mechanic to confirm if your specific symptoms (e.g., rough idle, oil consumption) align with the kit s intended benefits.

Ultimately, this is a low-risk, high-reward upgrade for the right rider. For most stock riders, it s not essential, but for those optimizing their bikes, it s a smart addition.

Details:

PACKAGE INCLUDED: 1 Pair as the picture show, - Comes with 2 pieces of Uni foam So you can pick or switch them out. These bolts are the cleanest way to solve your crankcase venting issues when installing aftermarket air cleaners on Harley. Easy to in stall, no installation instructions. 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: Chrome Size: as the picture shown Features: CNC machined from solid billet aluminum.

In this case, pictures that can clearly show the problem are NECESSARY. Head Breather Bolts Kit For Harley EVO Big Twin Dyna Touring Sportster XL 91-22 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 .

part #: 090010017c price

  • $12.92

specifications intakefuelmotorcycle:

  • for models: Touring, Evo, Twin, Dyna, Sportster
  • for makes: Harley
  • for years: 1991-2022
  • brand: Lenkdou
  • mpn: 09001-0017c-df
  • part type: Head Breather Bolt
  • material: Aluminum
  • manufacturer warranty: 1 Month
  • color: Chrome

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general intakefuelmotorcycle:

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

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  • options: Ship-to-home
  • started: February 10, 2026
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for models: touring, evo, twin, dyna, sportster, for makes: harley, for years: 1991-2022, part type: head breather bolt, manufacturer warranty: 1 month,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, color: chrome, material: aluminum, sku: 22358916939331782,
Lenkdou 09001-0017C Is Similar To:
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1 offer $12.92 USD
  • New. Offer #1 priced at $12.92 + $0.00 shipping estimate = $12.92* total. - Easy to in stall, no intallation instructions Fitment: - Fits 1991-2022 Sportster and 1991-1998 big twin evolution motors - Fits 1991-1998 Dyna, CVO, Softail and Touring models Or will fit bolt thread size 1/2-13 by 3/4 length Description: - Condition:100% brand new - Material: Billet Aluminum - Color: Chrome - Size: as the picture shown Features: - CNC machined from solid billet aluminum.FREE SHIPPING

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