KAWASAKI 11012-1125 Air Boxbox Box Rubber Airbox

( Manufacturer Part Number: 11012-1125 ), ( Part Type: Box ), ( Color: Black ), ( Compatible Model: Kx250 Kx420 ), ( Material: Rubber ), ( Vintage Part: Yes ), ( Compatible Year: 1981, 1980 ), ( Country Of Origin: Japan )

Review KAWASAKI Original Oe Airbox Air Box Rubber fits KX250 KX 420 250 1980–1981

The **Kawasaki 11012-1125 80-81 KX 420/250 Airbox Rubber Airbox** is a meticulously engineered component designed to enhance the performance, durability, and reliability of Kawasaki s legendary KX 420 and KX 250 dirt bikes from the 1980-1981 model years. Crafted from high-quality rubber and precision-molded to fit seamlessly within the airbox assembly, this part serves as a critical interface between the air filter and the engine s intake system. The airbox rubber plays a vital role in maintaining optimal airflow while minimizing dust, debris, and moisture ingress, which is essential for protecting the sensitive components of the bike s intake tract, including the air filter, throttle body, and carburetor. Engineered to withstand the rigors of off-road riding, this rubber airbox is built to endure extreme temperatures, vibrations, and mechanical stress, ensuring long-lasting performance even under the most demanding conditions. Whether you're tackling rough trails, competing in motocross events, or simply maintaining your bike for daily use, this genuine Kawasaki replacement part guarantees a secure, airtight seal that preserves engine efficiency and extends the lifespan of your bike s intake system. Its compatibility with the 1980 and 1981 KX 420 and KX 250 models ensures an exact fit, allowing for easy installation without the need for modifications or additional adapters. By upgrading or replacing your airbox rubber with this high-performance component, you not only restore factory specifications but also optimize your bike s breathing capacity, leading to improved throttle response, better fuel economy, and enhanced overall power delivery. Ideal for both restoration projects and routine maintenance, this part is a must-have for any Kawasaki enthusiast seeking to maintain the peak condition of their classic off-road machine.

### **Pros and Cons of Buying a Kawasaki 11012-1125 (80-81) KX420 or KX250 with an Airbox (Rubber or KX250 Airbox)**

#### **Kawasaki KX420 (1980-1981) Overview**

The KX420 was Kawasaki s first true off-road dirt bike, designed for motocross and enduro racing. It was a groundbreaking machine in its era, known for its aggressive styling, lightweight frame, and strong performance. The 1980-81 models were among the first production bikes to feature a **rubber airbox** (a sealed, flexible air intake system) and a **KX250-style airbox** (a more rigid, metal-backed design) as aftermarket upgrades.

---

### **Pros of Buying a 1980-81 KX420 with an Airbox**

1. **Historical Significance & Collectibility**

- The KX420 is one of the most iconic motocross bikes ever made, especially in the early '80s. Owning one is a piece of motocross history.

- Well-preserved examples are highly sought after by collectors, making them valuable in the long term.

2. **Strong Performance for Its Time**

- The **248cc air-cooled single-cylinder engine** produced around **35-40 horsepower**, which was impressive for its era.

- The **lightweight aluminum frame** and **suspension** (with adjustable forks) made it highly maneuverable and capable on rough terrain.

- The **rubber airbox** (when properly installed) improved airflow and reduced intake noise, giving it a more aggressive sound and better throttle response.

3. **Durability & Reliability**

- Kawasaki s early dirt bikes were built to last, and the KX420 s engine and drivetrain are known for longevity if maintained properly.

- The **single-cylinder design** is simpler than modern multi-cylinder engines, making repairs and modifications easier for those with mechanical skills.

4. **Modification Potential**

- **Airbox upgrades** (rubber or KX250-style) for better airflow.

- **Performance exhausts** (e.g., Akrapovic, T&S) for more power.

- **Suspension upgrades** (e.g., hlins, Showa) for better handling.

- **Clutch and crankshaft upgrades** for increased power.

- The bike can be **restored to showroom condition** or **built for track use** with minimal cost compared to modern bikes.

5. **Affordability (Compared to Modern Bikes)**

- A **basic KX420 in average condition** can be bought for **$1,500 $3,000**, while a **fully restored or race-ready example** may cost **$5,000 $10,000 **.

- Parts are still relatively accessible, though some rare components (like original forks or carburetors) may require sourcing from collectors.

6. **Great for Learning & Riding Experience**

- The **lightweight and simple design** make it an excellent bike for **beginner to intermediate riders** learning motocross fundamentals.

- The **manual transmission** teaches precise control, which is beneficial for riders progressing to more advanced bikes.

7. **Community & Racing Potential**

- The **classic motocross scene** still thrives, with many riders and clubs preserving and racing vintage bikes.

- The KX420 can compete in **historical motocross events**, where it would be a strong contender against other '80s bikes.

---

### **Cons of Buying a 1980-81 KX420 with an Airbox**

1. **Age-Related Wear & Maintenance Needs**

- **Rust** is the biggest enemy check the **frame, suspension, and engine components** for corrosion.

- **Suspension (forks and shock)** will likely need replacement or rebuilding.

- **Brakes (drum or disc, depending on model)** may be worn out and require upgrades.

- **Carburetor (Pike or Mikuni)** may need cleaning or replacement to run smoothly.

2. **Reliability Issues if Neglected**

- **Engine wear** (pistons, rings, bearings) can be an issue if the bike was ridden hard before being stored.

- **Clutch and crankshaft** may need attention if the bike was used aggressively.

- **Electrical system** (if equipped) can be finicky check for rusted connections.

3. **Limited Modern Comfort & Features**

- **No disc brakes** (1980 model had drum brakes; 1981 had optional discs).

- **Basic ergonomics** seat, handlebars, and footpegs may feel outdated compared to modern bikes.

- **No electronic fuel injection (EFI)** carburetion requires tuning and adjustment.

4. **Airbox Installation Challenges**

- While the **rubber airbox** improves performance, it **requires proper installation** to avoid leaks and ensure correct airflow.

- A **poorly fitted airbox** can cause **intake noise issues** or **reduced power**.

- The **KX250-style airbox** (a more rigid, metal-backed design) is better for performance but may not fit as neatly as the rubber version.

5. **Parts Availability & Costs**

- **Original parts** (forks, springs, seals) can be expensive or hard to find.

- **Aftermarket parts** (e.g., modern suspension, performance exhausts) are available but may not be as refined as OEM components.

- **Replacement engine components** (pistons, crankshafts) can be costly if the bike is heavily worn.

6. **Not Ideal for Heavy Riders**

- The **lightweight frame** (around **200 lbs dry**) is not designed for riders over **180-200 lbs**.

- The **suspension travel (6.5 inches)** may feel short for aggressive riding on modern trails.

7. **Noise & Legal Restrictions**

- The **stock exhaust and airbox** can be **very loud**, potentially violating noise ordinances in some areas.

- Some **modern airboxes (like the KX250-style)** may still produce excessive noise unless paired with a **performance exhaust**.

8. **Learning Curve for Restoration**

- Restoring a **30 year-old bike** requires **mechanical knowledge** not just riding skills.

- If you re not comfortable with **engine work, suspension rebuilding, or electrical troubleshooting**, costs can add up quickly.

---

### **Kawasaki KX250 (1980-1981) Airbox Comparison**

The **KX250** was Kawasaki s smaller sibling to the KX420, featuring a **247cc engine** and similar **rubber airbox** design. While it lacks the raw power of the KX420, it shares many of the same **pros and cons**:

#### **Pros of KX250 with Airbox**

- **More affordable** than a KX420 (often **$1,000 $2,500** in average condition).

- **Lighter and more nimble** great for **smaller riders or technical trails**.

- **Easier to modify** due to its simpler design.

- **Still a classic bike** with strong collector appeal.

#### **Cons of KX250 with Airbox**

- **Less power** ( 30-35 hp) compared to the KX420.

- **More prone to rust** due to its smaller frame and simpler construction.

- **Limited aftermarket support** compared to the KX420.

---

### **Final Recommendation & Conclusion**

#### **Who Should Buy a 1980-81 KX420 or KX250 with an Airbox?**

- Are a **mechanically inclined rider** who enjoys **restoration projects**.

- Want a **historical, collectible bike** with strong resale potential.

- Prefer **lightweight, simple, and forgiving** riding dynamics.

- Plan to **modify it for track use** (motocross, enduro, or historical racing).

- Enjoy the **challenge of maintaining an older bike** and don t mind occasional repairs.

- Are a **smaller to medium-sized rider** (under 200 lbs) who values **agility over comfort**.

- Want a **modern, hassle-free riding experience** with electronic aids (EFI, traction control).

- Are **not comfortable with basic mechanical work** (forks, carburetors, brakes).

- Plan to **ride heavily on rough terrain** without frequent maintenance.

- Live in an area with **strict noise laws** (the stock exhaust is very loud).

- Prefer **comfort and ergonomics** over historical significance.

- **Project Bike:** Restore it to **showroom condition

Details:

Kawasaki Kx 250 clutch cover, good condition.

part #: 110121125 price

• $19.99

specifications intakefuelmotorcycle:

• for models: Kx250, Kx, 420, 250
• for makes: Kawasaki
• for years: 1980-1981
• mpn: 11012-1125
• part type: Box
• color: Black
• compatible model: Kx250 Kx420
• material: Rubber
• vintage part: Yes
• compatible year: 1981, 1980
• country of origin: Japan

general intakefuelmotorcycle:

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

shipping intakefuelmotorcycle:

• transit: 3-8 Days
• carrier: USPS
• class: Standard
• cost: $4.00
• service: USPS Ground Advantage
• type: Fixed

payments intakefuelmotorcycle:

• credit card: Mastercard
• wallet: Google-pay
• other

seller intakefuelmotorcycle:

• # reviews: 2006
• city: Ruidoso Downs, New Mexico
• rating: 100.0%

returns intakefuelmotorcycle:

• paid by: Buyer
• time: 14 Days
• policy: Returns Accepted

offer intakefuelmotorcycle:

• options: Ship-to-home
• availability: In Stock
• sold: 0
• started: June 8, 2026
• quantity: 1

Kawasaki 11012-1125 Is Similar To:

• Zr750c Zephyr Usa 91-93 Filter Kawasaki Ship 1011-0365 Air Free Flo (35% similar) ...(August 29th, 2014)
• 1011670001 Kawasaki Maier Aftermarket Kfx Air Box Cover Black (39.4% similar) New kawasaki air box cover black. Contact your local dealer for fitment questions. All parts are marked from the riding position. This item for sale may fit other makes, model's, and years...(November 19th, 2018)
• 1060162 Kawasaki Ninja Airbox Air Intake Filter Box (45.7% similar) More options available upon request. If the item does not fit motorcycle model's specified in listing. Each part is systematically placed to be easily located once purchased. Many countries only allow 79 max package length and girth combined...(July 5th, 2018)
• Kle 11010-0108 Ex650r Air Kawasaki Ninja Er Versys 650 Box (32.6% similar) Please feel free to ask questions or picture requests. This list is a courtesy. I took many pictures of all angles so take a look. See list below. This item is in used condition see pictures. See pictures. It has a few scuffs and is missing a few screws as shown. This item is an air box from a 2006...(August 30th, 2014)
• 11010-0153 Not Specified Kawasaki Versys Airbox Air Intake Filter Box (37.2% similar) I combine shipping as long it fits in the same box. These are used parts, so I ask you to please look at pictures and read the carefully. Removed from: kawasaki with miles please review all pictures to assess the condition of item. Oem parts aftermarket tires Yamaha Suzuki BMW accessories tools ...(March 31st, 2019)
• 11010-0156 Not Specified Kawasaki Ninja Airbox Air Intake Filter Box (40.3% similar) 2009 kawasaki ninja 650R EX650C air box this is in very good condition and shows normal signs of wear. Please see pictures. Removed from a kawasaki ninja 650R EX650C comes as pictured...(August 22nd, 2018)
• 11010-0198 Kawasaki Ninja Air Intake Box Airbox Filter Housing (40.6% similar) So we wish for you to only have a positive experience. What is in the pictures. Addition photo may be seen in top left corner of this listing by using scroll bar. You can also be assured that the service will continue after receive purchase. Larger sized items may go FedEx ground. Can't find the ...(June 27th, 2018)
• 11010-071-21 Kawasaki 1977 Ke125 Air (30.4% similar) Or visit our for tons of great deals on new and used parts. Some bags could be ripped or may have been taped up, hardware missing. Item: 5611: please review all of the photos...(February 21st, 2018)
• 11010-0713 Yamaha Kawasaki Ninja Airbox Air Intake Filter Box (42.3% similar) Removed from: 2013 kawasaki ninja ZX10R ZX1000J with unknown miles please review all pictures to assess the condition of item. R cycle parts 2013 kawasaki ninja ZX1000J ZX10R air box air intake filter box this is in very good condition and shows normal signs of wear...(March 29th, 2019)
• 11010-0841 Kawasaki Versys Airbox Air Intake Filter Box (41.2% similar) Kawasaki versus 650 air box air intake filter box this is in very good condition and shows normal signs of wear. Removed from: please review all pictures to assess the condition of item...(October 2nd, 2018)
• 11010-1017 Kawasaki Kz Airbox Air Intake Filter Element Housing Box (37.8% similar) Be 8VSC88AZI2I please review all pictures to assess the condition of item...(August 21st, 2018)