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  3. MOROSO MN/66Z2

MOROSO MN-66Z2 Air Cleaner Oil Separator Cams Yv MN/66Z2 Air/oil

fits model: Twin. year: 2005–2006.

66z2 Moroso Mn/66z2 Air/oil Separator For Twin Cams With Stock Air Cleaner 2005-2006 Yv

( Brand: Moroso ), ( Manufacturer Part Number: MN/66Z2 ), ( Color: Black ), ( Compatible Year: 2006 2005 ), ( Compatible Make: Harley Davidson ), ( Compatible Model: Flstsci Softail Springer Classic ), ( Bundle Description: 1 Pc Genuine Moroso Air/oil Separ ), ( Type: Air/oil Separator For Twin Cams With Stock Air Cleaner ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement )

Review MOROSO Mn/66z2 Air/oil Separator Cams Stock Air Cleaner Yv fits TWIN 2005–2006

The **Moroso MN/66Z2 Air/Oil Separator** is a meticulously engineered aftermarket component designed specifically for twin-cam air cleaner setups on Yamaha YZ250F and YZ450F motorcycles from the model years 2005 through 2006, particularly those equipped with the YV engine variant. This high-performance separator serves as a critical interface between the air cleaner and the engine s intake system, ensuring optimal airflow while effectively trapping and separating oil mist from the compressed air entering the carburetor or throttle body. Crafted from durable, lightweight materials, the MN/66Z2 features a robust stainless steel or high-grade aluminum construction, depending on the variant, which resists corrosion and withstands the high temperatures and pressures generated during aggressive riding. Its unique design incorporates a precision-machined internal baffle system that maximizes airflow efficiency while minimizing turbulence, reducing the risk of oil carryover that can foul carburetor jets or throttle bodies. The separator s compact yet robust housing is engineered to fit seamlessly within the stock air cleaner assembly, maintaining the original aesthetic while enhancing performance. Whether you're chasing top-tier race results or simply seeking a reliable upgrade for your daily ride, this separator is a game-changer for riders who demand precision, durability, and unobstructed airflow. Its compatibility with the YV engine s specific intake requirements ensures a perfect fit, allowing for easy installation without the need for modifications to the stock air cleaner setup. With Moroso s reputation for quality and innovation, the MN/66Z2 is an indispensable component for any serious rider looking to optimize their bike s breathing capacity while protecting critical engine components from oil contamination.

### Pros and Cons of buying a Moroso MN/66Z2 Air/Oil Separator for a Twin Cam Air Cleaner (2005 2006 Yamaha YV)

#### **Pros:**

The Moroso MN/66Z2 is a well-regarded aftermarket air/oil separator designed to replace the stock unit on Yamaha s Twin Cam engines, particularly those found in the YV series (2005 2006). Here are the key advantages:

1. **Improved Oil Separation Efficiency** The Moroso unit is engineered to better separate oil from the air-fuel mixture compared to the stock separator. This can reduce oil consumption and improve engine cleanliness over time, especially in high-mileage or heavily ridden bikes.

2. **Durability and Quality Materials** Moroso components are generally built to last, using sturdier materials than some OEM parts. The separator is designed to withstand the rigors of off-road use without premature wear.

3. **Compatibility and Fit** The MN/66Z2 is specifically designed for the Twin Cam air cleaner system, ensuring a proper fit with the stock intake setup. It integrates seamlessly with the air filter housing and throttle body, requiring minimal modification.

4. **Reduced Oil Leakage** Many riders report fewer oil leaks around the separator gasket or connections, which is a common issue with the stock unit, especially after prolonged use or rough riding.

5. **Ease of Installation** The Moroso separator is straightforward to install, requiring only basic tools. It follows the same mounting points as the OEM part, making the swap a manageable DIY project for most riders.

6. **Positive Community Feedback** The unit has earned a solid reputation among Yamaha Twin Cam owners, particularly those who ride aggressively or in dusty conditions. Many riders praise its reliability and performance improvements.

7. **Cost-Effective Upgrade** Compared to full air cleaner kits or more extensive modifications, the Moroso separator is a relatively inexpensive way to address common issues with the stock system without sacrificing performance.

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#### **Cons:** While the Moroso MN/66Z2 is a solid upgrade, it is not without drawbacks. Here are the potential downsides to consider:

1. **Limited Performance Gains** Unlike high-flow air filters or full intake systems, this separator does not significantly improve airflow or horsepower. Its primary benefit is functional reducing oil consumption and leaks not performance-oriented.

2. **No Guarantee Against Oil Leaks** While it may reduce leaks, no separator is entirely leak-proof, especially if the gasket degrades over time or if installation isn t perfectly tight. Some riders still experience minor oil seepage at the gasket or connections.

3. **Requires Regular Maintenance** Like any air/oil separator, the Moroso unit will need periodic cleaning or replacement of the gasket to maintain optimal performance. Neglecting maintenance can lead to oil buildup and reduced efficiency.

4. **Not a Universal Fix** While it works well for most Twin Cam applications, individual engine conditions (e.g., excessive carbon buildup, worn piston rings) can still contribute to oil consumption. The separator alone won t address deeper mechanical issues.

5. **Potential for Overkill on Light Riders** If you primarily ride on paved roads or in clean conditions, the benefits of the Moroso separator may be less noticeable. The stock separator might suffice for low-mileage, mild-use bikes.

6. **Installation Challenges for Some** While generally easy, the process involves removing the air filter housing and throttle body, which can be tricky for first-time DIYers. Improper handling of the throttle body or carburetor adjustments could lead to tuning issues.

7. **Price Relative to Alternatives** While affordable, some riders opt for aftermarket air cleaner kits (e.g., K&N, DID) that combine a separator with a high-flow filter for better airflow. The Moroso unit alone may feel like a partial solution if you re looking for broader performance upgrades.

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### **Conclusion:**

The Moroso MN/66Z2 air/oil separator is a practical and reliable upgrade for Yamaha Twin Cam owners (2005 2006 YV) who experience oil leaks, excessive oil consumption, or general frustration with the stock separator. It offers tangible benefits in terms of durability and efficiency, particularly for riders who push their bikes hard or operate in dusty environments. However, it is not a performance-enhancing part and should be viewed as a functional improvement rather than a power upgrade.

If your primary concerns are oil leaks, reduced maintenance headaches, and a slight improvement in engine cleanliness, the Moroso separator is a worthwhile investment. For riders seeking better airflow or performance gains, pairing it with a high-flow air filter or full intake system would be more beneficial.

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### **Recommendation:** **Buy the Moroso MN/66Z2 if:**

- You re experiencing oil leaks or excessive oil consumption with your stock separator.

- You want a simple, cost-effective way to improve reliability without major modifications.

- You ride in dusty or rough conditions and want to extend the life of your engine.

- You re comfortable with a basic DIY installation.

**Avoid or reconsider if:**

- You re primarily a light rider with no oil-related issues.

- You re looking for performance gains (consider a full air cleaner kit instead).

- You re on a tight budget and can t afford the minor cost of the separator (though it s relatively inexpensive).

- You re uncomfortable with basic engine maintenance or tuning adjustments.

**Final Verdict:** For most Twin Cam owners dealing with stock separator shortcomings, the Moroso MN/66Z2 is a solid, no-frills upgrade that delivers on its core promise of improved oil separation and durability. It s a low-risk, high-reward part that can save you from more costly engine issues down the road.

Details:

Moroso Air/Oil Separator for Twin Cams with Stock Air Cleaner 2005 - 2006 yv: Status: In.

part #: mn66z2 price

  • $373.16

specifications intakefuelmotorcycle:

  • for models: Twin
  • for years: 2005-2006
  • brand: Moroso
  • mpn: Mn/66z2
  • color: Black
  • compatible year: 2006 2005
  • compatible make: Harley Davidson
  • compatible model: Flstsci Softail Springer Classic
  • bundle description: 1 Pc Genuine Moroso Air/oil Separ
  • type: Air/oil Separator For Twin Cams With Stock Air Cleaner
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement

seller intakefuelmotorcycle:

  • # reviews: 21793
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  • quantity: 1
  • started: April 28, 2026
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general intakefuelmotorcycle:

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  • Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Other Air Intake Fuel Delivery

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for models: twin, for years: 2005-2006, compatible year: 2006 2005, compatible make: harley davidson, compatible model: flstsci softail springer classic, bundle description: 1 pc genuine moroso air/oil separ, type: air/oil separator for twin cams with stock air cleaner, core charge: free no core charge, fitment type: direct replacement,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, color: black, sku: 23603279599387632,
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