1. Motorcycle Intake & Fuel Systems Deals
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  3. YAMAHA 1W4145100

YAMAHA 1W4145100 Cage Air Filter

fits model: Yz-250, Yz-400. make: Yamaha. year: 1977–1978.

1w4145100 Yamaha 77 78 Yz-250 Yz-400 Oem Air Filter Cage

( Manufacturer Part Number: 1W4145100 ), ( Part Type: Cage Filter ), ( Country Of Origin: Japan )

Review YAMAHA Oem Air Filter Cage fits YZ-250 YZ-400 1977–1978

The **Yamaha 1W4145100 78 YZ-250/YZ-400 Air Filter Cage** is a precision-engineered component designed to enhance the performance, reliability, and longevity of Yamaha s iconic YZ-250 and YZ-400 off-road motorcycles. Crafted from high-quality, durable materials, this air filter cage serves as the protective housing for the motorcycle s air filter, ensuring optimal airflow while shielding it from dirt, debris, and mechanical damage. The cage is meticulously manufactured to fit seamlessly with Yamaha s stock air filter system, maintaining the factory s aerodynamic efficiency while offering the added benefit of easy access for maintenance and cleaning. Constructed with a robust, corrosion-resistant design, this component is built to withstand the rigors of off-road riding, including exposure to dust, mud, and harsh environmental conditions. The cage s smooth, contoured shape not only improves airflow dynamics but also reduces turbulence, allowing the engine to breathe more efficiently and maintain peak power output. Whether you're tackling rough trails, competing in motocross events, or simply enjoying weekend rides, this air filter cage ensures that your Yamaha s air intake remains clean and unrestricted, contributing to smoother operation, reduced engine wear, and improved fuel efficiency. Its compatibility with both the YZ-250 and YZ-400 models makes it a versatile upgrade for riders looking to enhance their bike s performance without compromising on durability or ease of installation. With its straightforward design and reliable construction, this component is an essential accessory for any Yamaha enthusiast seeking to optimize their motorcycle s performance while keeping maintenance simple and hassle-free.

### **Pros and Cons of buying a Yamaha 1W4145100 (78 YZ-250/YZ-400 Air Filter Cage)**

#### **Pros:**

1. **Compatibility** This part is designed specifically for the **1978 Yamaha YZ-250 and YZ-400**, ensuring a perfect fit without modifications.

2. **Performance Benefits** A well-maintained or upgraded air filter cage can improve airflow, reducing restriction and potentially enhancing engine performance.

3. **Durability** Yamaha parts are generally built to last, especially if the cage is in good condition or replaced with a high-quality aftermarket version.

4. **Ease of Installation** Since it s an OEM (Original Equipment Manufacturer) part, installation is straightforward, requiring minimal tools.

5. **Cost-Effective** Compared to full engine rebuilds or major upgrades, replacing just the air filter cage is a low-cost maintenance or upgrade option.

6. **Prevents Contamination** A properly functioning air filter cage helps keep debris out of the engine, reducing wear and tear.

7. **Classic Bike Preservation** If you own a vintage Yamaha, using genuine or high-quality aftermarket parts helps maintain the bike s original integrity.

#### **Cons:**

1. **Age-Related Wear** If the original part is from a 1978 model, it may be worn out, cracked, or corroded, requiring replacement rather than reuse.

2. **Limited Availability** OEM parts for older models can be harder to find, especially if the bike is no longer in production.

3. **Potential for Counterfeit Parts** Buying from untrusted sellers may result in fake or low-quality replicas that don t fit properly or last long.

4. **No Major Performance Gain** Unlike high-end air filter upgrades (e.g., K&N or aftermarket foam filters), this OEM cage won t drastically improve power it s more about maintenance.

5. **Corrosion Risk** Older metal parts may have rust or pitting, which could affect sealing and airflow if not cleaned or replaced.

6. **Aftermarket Alternatives May Be Better** Some aftermarket cages offer improved airflow or easier maintenance, though they may not be OEM-compatible.

7. **Labor Costs if Professional Installation is Needed** If you re not comfortable working on the bike yourself, a mechanic may charge for installation.

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### **Conclusion**

The **Yamaha 1W4145100 air filter cage** is a solid choice if you need a **direct replacement for a 1978 YZ-250 or YZ-400**, especially if the original is damaged or missing. It ensures proper fitment and helps maintain engine health by preventing debris entry. However, if the part is old and corroded, it may not be worth salvaging replacing it with a **new OEM or high-quality aftermarket version** is often the better option.

If you re looking for **better airflow or easier maintenance**, an aftermarket cage (like those from **Yamaha Performance Parts, K&N, or other trusted brands**) might be worth considering, even if it requires slight modifications. For most vintage bike owners, this part is a **practical and cost-effective solution** for basic maintenance.

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### **Recommendation**

- **If the original cage is intact and functional**, clean it thoroughly (rinse with water, dry, and apply silicone spray) before reuse.

- **If the cage is damaged, rusted, or missing**, purchase a **new OEM part (1W4145100) or a high-quality aftermarket alternative** (e.g., **Yamaha Performance Parts or a reputable vintage bike parts supplier**).

- **For improved airflow**, consider an **aftermarket foam or paper filter** (e.g., **K&N, Mikuni, or Yoshimura**) paired with the cage, but ensure compatibility.

- **Always check for authenticity** when buying online to avoid counterfeit parts.

- **If unsure about installation**, consult a Yamaha specialist or a motorcycle mechanic familiar with vintage models.

**Final Verdict:** This is a **reliable, budget-friendly option for OEM replacement**, but weigh the condition of the existing part against the cost of a new one before deciding.

Details:

77,78 Yamaha YZ-250,yz-400 oem air Filter Cage, 1W41451 good usable.

part #: 1w4145100 price

  • $25.00

specifications intakefuelmotorcycle:

  • for models: Yz-250, Yz-400
  • for makes: Yamaha
  • for years: 1977-1978
  • mpn: 1w4145100
  • part type: Cage Filter
  • country of origin: Japan

returns intakefuelmotorcycle:

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

general intakefuelmotorcycle:

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

shipping intakefuelmotorcycle:

  • type: Calculated
  • service: USPS Priority Mail Padded Flat Rate Envelope
  • class: Expedited
  • cost: $14.00
  • transit: 2-6 Days
  • carrier: USPS

seller intakefuelmotorcycle:

  • rating: 100.0%
  • # reviews: 5983
  • city: Florence, Montana

offer intakefuelmotorcycle:

  • quantity: 1
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home
  • started: June 11, 2026
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for models: yz-250, yz-400, for makes: yamaha, for years: 1977-1978, part type: cage filter, country of origin: japan,
category: motorcycle parts > motorcycle scooter parts accessories > air intake fuel delivery, sku: 24292046065870872,
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1 offer $25.00 USD
  • Used. Offer #1 priced at $25.00 + $14.00 shipping estimate = $39.00* total. 77,78 yamaha yz-250,yz-400 oem air Filter Cage, , good usable.+$14.00 shipping

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