SUZUKI USPT645383 Air Box Boxbox Airbox

( Manufacturer Part Number: USPT645383 ), ( Sub-type: Other Air Intake Fuel ), ( Type: Air Intake Fuel Delivery ), ( Intended Use: Replacement Part ), ( Country Of Origin: Japan )

Review SUZUKI Original Air Box Assembly Airbox fits GS750 GS 750 1977–1979

The **Suzuki GS750 Air Box (Part # USPT645383)** is a meticulously engineered component essential for maintaining optimal performance and longevity in the iconic 1977 through 1979 Suzuki GS750 motorcycle. This airbox serves as the critical interface between the ambient air and the engine s intake system, ensuring a clean and efficient flow of air to the carburetors while protecting the delicate internal components from dust, debris, and moisture. Crafted from durable, high-quality materials, the airbox is designed to withstand the rigors of daily riding, from spirited highway cruising to off-road adventures, without compromising structural integrity. Its precise fitment is achieved through careful engineering, allowing for a seamless integration with the GS750 s intake manifold and carburetor setup, typically featuring the iconic Mikuni or Keihin carburetors of the era. Beyond its functional role, this airbox contributes to the classic aesthetic of the GS750, blending seamlessly with the motorcycle s timeless design while delivering the reliability expected from Suzuki s legendary engineering. Whether restoring a vintage GS750 to its original glory or upgrading an existing bike for improved performance, this airbox is a vital replacement part that ensures smooth operation, reduced carbon buildup, and enhanced throttle response. Its compatibility with aftermarket modifications, such as performance air filters or intake systems, further underscores its versatility, making it a must-have component for enthusiasts seeking both authenticity and performance.

### Pros and Cons of Buying a 1977 1979 Suzuki GS750 with an Air Box (USPT645383)

1. **Classic Design and Nostalgia** The GS750 is an iconic motorcycle from the golden era of Japanese sport bikes, prized by enthusiasts for its timeless styling and cultural significance. Owning one connects you to a storied history of motorcycle engineering.

2. **Reliable Engine** The 748cc air-cooled, single-cylinder (though often mistakenly called a "single" in modern terms it s actually a twin-cylinder in a single-case design) engine is robust and capable of handling moderate cruising and spirited riding. With proper maintenance, it can last well over 100,000 miles.

3. **Simplicity and Durability** The air-cooled design and straightforward mechanical layout make it easier to work on compared to modern liquid-cooled bikes. Many parts are still available, and the lack of complex electronics reduces potential failure points.

4. **Lightweight and Maneuverable** At around 450 470 lbs (depending on modifications), it s lighter than many modern cruisers or touring bikes, making it nimble and fun to ride in urban or twisty roads.

5. **Modding Potential** The GS750 has a strong aftermarket presence, with options for performance upgrades (e.g., carburetor swaps, exhaust systems, suspension tuning) and customization (paint, saddlebags, fairings). The air box (USPT645383) is a common modification to improve airflow and cooling, which can enhance throttle response and reliability in hot climates.

6. **Lower Operating Costs** Fuel efficiency is decent for its class (around 40 50 mpg), and basic maintenance (oil changes, chain adjustments) is affordable. Parts are widely available, though some may require sourcing from specialty shops.

7. **Community and Enthusiast Support** There s a dedicated community of GS750 owners and restorers who share knowledge, parts, and restoration tips. Clubs and meetups (both online and in-person) make it easier to find help or camaraderie.

8. **Resale Value for Classics** While not as high as some modern collector bikes, well-maintained GS750s hold value among enthusiasts, especially if they re in original or restored condition.

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1. **Age and Wear** Bikes from this era are inherently older, and many will require significant maintenance or restoration. Rust, worn suspension, and outdated electrical systems (e.g., points ignition in some models) are common issues.

2. **Poor Fuel Economy for Modern Standards** At 40 50 mpg, it s decent for its time, but today s riders expect better efficiency, especially on longer trips. Modern bikes easily achieve 60 mpg.

3. **Comfort Limitations** The ergonomics are basic by today s standards. The riding position is upright and less aerodynamic, leading to wind fatigue on highway rides. Seat comfort and wind protection are minimal compared to modern bikes.

4. **Reliability Concerns** The air-cooled engine can overheat in stop-and-go traffic or hot climates if not properly maintained. The air box modification (USPT645383) helps, but it s not a cure-all. Ignition systems (points or early electronic) may fail over time, and the battery can be finicky.

5. **Safety Features** Modern bikes have ABS, traction control, and advanced braking systems. The GS750 lacks these, relying on drum brakes (front) and a single disc (rear), which are less effective in stopping power or modulation.

6. **Noise and Vibration** The engine is loud, especially at higher RPMs, and the lack of modern sound insulation means you ll hear (and feel) every rev. Vibration can be noticeable, particularly at highway speeds.

7. **Legal and Practical Issues** Some modifications (e.g., exhaust systems, carburetor swaps) may not meet modern emissions standards in certain regions. Additionally, the bike s weight and lack of modern stability can make it less suitable for aggressive riding or highway speeds.

8. **Parts Availability** While many parts are still available, some may require searching through specialty shops, eBay, or restoration suppliers. Original components (e.g., specific carburetors, wiring harnesses) can be hard to find without sourcing from collectors.

9. **Insurance and Registration** Classic bikes often have higher insurance premiums due to their value and potential for damage. Some states or countries may have restrictions on registering older bikes without modern safety features.

10. **Learning Curve** Riding a bike this old requires patience. Modern bikes have power steering, disc brakes, and smoother transmissions, while the GS750 s manual transmission and drum front brake can feel less responsive.

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The 1977 1979 Suzuki GS750 with an air box (USPT645383) is a fantastic choice if you re seeking a **nostalgic, mechanically simple, and modifiable** motorcycle for casual riding, track days, or restoration projects. It s ideal for riders who prioritize **character, community, and hands-on maintenance** over modern convenience. The air box is a worthwhile upgrade for improving airflow and cooling, especially in hot conditions, but it s not a fix for all reliability issues.

However, if you re looking for a **daily rider, highway cruiser, or bike with modern safety and comfort features**, the GS750 s limitations in fuel efficiency, ergonomics, and braking will be noticeable. It s also not the best choice for riders who dislike maintenance or prefer plug-and-play technology.

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- You re an enthusiast who enjoys working on bikes and appreciates classic design.

- You plan to ride it **moderately** (e.g., weekend cruising, track use, or commuting in mild conditions).

- You re prepared to **invest time and money in maintenance and potential restoration**.

- You want a bike with **strong modding potential** and a supportive community.

- You re okay with **compromises in comfort, safety, and efficiency** for the sake of authenticity.

- You need a **reliable daily rider** with modern features like ABS, traction control, or long-range fuel capacity.

- You dislike **noise, vibration, or manual maintenance** (e.g., points ignition, drum brakes).

- You re on a **tight budget** for parts or repairs, as older bikes can be expensive to keep running.

- You prioritize **highway stability, wind protection, or fuel efficiency** over classic aesthetics.

- If you love the GS750 s look but want more modern reliability, look for a **restored or well-maintained example** with updated components (e.g., disc brakes, electronic ignition).

- For a balance of classic charm and modern practicality, consider a **later-model GS750 (1980s)** or a **Yamaha XS650**, which are slightly more refined.

- If you re new to classic bikes, start with a **less expensive or simpler model** (e.g., a Honda CB750 or Kawasaki Z1) to learn maintenance before committing to a GS750.

Ultimately, the GS750 is a **passion project bike** it s not for everyone, but for the right rider, it s an unforgettable experience.

Details:

Used GS750 air box.

part #: uspt645383 prices

• $45.00-$149.99

specifications intakefuelmotorcycle:

• for models: Gs750, Gs, 750
• for makes: Suzuki
• for years: 1977-1979
• mpn: Uspt645383
• sub-type: Other Air Intake Fuel
• type: Air Intake Fuel Delivery
• intended use: Replacement Part
• country of origin: Japan

shipping intakefuelmotorcycle:

• cost: $11.42
• transit: 7-10 Days
• class: Standard
• type: Calculated
• service: USPS Ground Advantage, UPS Ground
• carrier: USPS, UPS

general intakefuelmotorcycle:

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

seller intakefuelmotorcycle:

• # reviews: 1917
• city: Elgin, Illinois
• rating: 100.0%

payments intakefuelmotorcycle:

• wallet: Apple-pay
• other
• credit card: Visa

offer intakefuelmotorcycle:

• sold: 0
• best offers: True
• quantity: 1
• started: April 22, 2026
• availability: In Stock
• options: Ship-to-home

returns intakefuelmotorcycle:

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

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