KAWASAKI K008-4 Keyster Carburetor Rebuild Mikuni Z1A

( Manufacturer Part Number: K008-4 ), ( Part Type: Carburetor ), ( Oe/oem Part Number: 58-0068 ), ( Color: Orange ), ( Material: Brass ), ( Compatible Year: 1973, 1974, 1975 ), ( Placement On Vehicle: Rear ), ( Country Of Origin: United States )

Review KAWASAKI Z1a Keyster Carburetor Rebuild Kits Mikuni fits Z1900 Z1 Z1B 900 1973-75

The Kawasaki K008-4, a critical component of the iconic 1973 1975 Kawasaki Z1900 (Z1, Z1A, and Z1B) series, represents a masterpiece of early motorcycle engineering, blending raw performance with timeless design. This rare and highly sought-after carburetor rebuild kit, specifically tailored for the legendary Keyster carburetor, is a meticulously crafted solution for restoring the soul of these legendary machines. The Z1 s reputation as one of the first true "superbikes" stems in part from its advanced engineering, including the K008-4 carburetor, which delivers a perfect balance of throttle response, fuel efficiency, and power delivery. Originally paired with the Z1 s 901cc air-cooled inline-four engine, this carburetor was designed to optimize performance while maintaining reliability a hallmark of Kawasaki s early innovations. The Keyster carburetor, known for its distinctive shape and robust construction, features a precise bore and a carefully calibrated venturi system that ensures smooth, consistent fuel delivery under varying loads. Whether you're reviving a showroom-worthy Z1A, a high-mileage Z1B, or a rare Z1 prototype, this rebuild kit offers everything needed to return the carburetor to factory-spec condition or even enhance its performance. The kit includes high-quality gaskets, precision-machined parts, and meticulously polished internals, ensuring a leak-free seal and optimal airflow. For restorers and enthusiasts, this is more than just a replacement it s a chance to preserve a piece of motorcycle history while ensuring the Z1 s legendary growl and acceleration remain intact. Whether you're tuning for street use, track days, or pure aesthetic restoration, the K008-4 rebuild kit stands as a testament to Kawasaki s engineering legacy, offering a blend of authenticity and performance that keeps the spirit of the Z1 alive for generations of riders.

### **Pros and Cons of Buying a Kawasaki K008-4 (1973 75) Z1900/Z1/900/Z1A/Z1B with Keystone Carburetor and Mikuni Rebuild**

#### **Pros**

1. **Classic Design and Heritage**

The Kawasaki Z1 series, particularly the Z1900 and Z1 models, are iconic motorcycles from the early 1970s. They represent a pivotal moment in motorcycle engineering, blending Japanese precision with American muscle bike aesthetics. Owning one allows you to ride a piece of automotive history.

2. **Strong Engine Potential**

The 904cc parallel-twin engine is legendary for its smoothness, reliability, and power potential. With proper maintenance, especially a Mikuni carburetor rebuild (if the original Keystone is being replaced), it can produce impressive performance for its era often exceeding 100 horsepower with modifications.

3. **Modification and Tuning Opportunities**

The Z1 platform is highly tunable. Aftermarket parts, such as Mikuni carburetors (like the 36mm or 38mm models), high-performance exhausts, and camshaft upgrades, can significantly enhance power and throttle response. The engine s simplicity also makes it easier to work on compared to modern fuel-injected bikes.

4. **Community and Support**

The Kawasaki Z1 has a dedicated and passionate community. Parts, restoration guides, and tuning advice are widely available online. Clubs and meetups exist for enthusiasts to share knowledge, making it easier to maintain and modify the bike.

5. **Reliability with Proper Care**

When maintained correctly, the Z1 engine is surprisingly durable. Many examples still run strong after decades, especially if the carburetor, ignition, and mechanical components are kept in good condition. A Mikuni rebuild ensures smooth operation and better fuel delivery than stock Keystone carbs.

6. **Unique Aesthetic Appeal**

The Z1 s aggressive, angular styling from the 1970s is timeless. It stands out on the road, making it a great choice for collectors or riders who appreciate vintage aesthetics without sacrificing performance.

7. **Lower Running Costs (Compared to Modern Bikes)**

Fuel, insurance, and maintenance costs are generally lower than for modern sportbikes. Parts are affordable, and labor is often cheaper than on contemporary machines.

---

#### **Cons**

1. **Age and Wear**

A 1973 75 Z1 is over 50 years old, meaning it will require significant maintenance. Common issues include worn-out bearings, seals, and clutch components. The frame and suspension may also need attention if the bike has been neglected.

2. **Carburetor and Fuel System Limitations**

The original Keystone carburetors are known for being finicky, prone to clogging, and difficult to tune properly. While a Mikuni rebuild improves reliability and performance, it doesn t eliminate the challenges of carbureted fuel delivery, which can be inconsistent in varying conditions (e.g., humidity, altitude).

3. **Electrical and Ignition Issues**

Older Z1s often suffer from weak or failing electrical systems, including the ignition coil, points, and wiring. Modern ignition systems (like electronic ignition) may be needed for reliability, adding complexity and cost.

4. **Suspension and Handling Limitations**

The stock suspension is stiff and outdated by modern standards. The bike can feel harsh on rough roads, and handling may not be as precise as contemporary sportbikes. Upgrading forks and shocks can help, but it requires investment.

5. **Rust and Frame Integrity**

Many older Z1s suffer from rust, particularly in the frame, fuel tank, and exhaust. A thorough inspection is essential to ensure the bike isn t structurally compromised. Rust repairs can be labor-intensive and costly.

6. **Limited Modern Comfort and Safety Features**

The Z1 lacks modern amenities like ABS, traction control, or advanced ergonomics. Riding posture is aggressive, and visibility can be poor, making it less suitable for long-distance touring unless heavily modified.

7. **Parts Availability and Lead Times**

While parts are generally available, some aftermarket components (especially for rare models like the Z1A/Z1B) may have long lead times or be expensive. Stock parts from the 1970s can also be hard to find without sourcing from collectors.

8. **Insurance and Registration Challenges**

Older bikes may have higher insurance premiums due to their value and potential risks. Some regions also have stricter registration requirements for vintage motorcycles, adding paperwork and cost.

9. **Performance Limitations Without Mods**

Stock Z1s are not as fast or refined as modern sportbikes. Without significant modifications (carburetor upgrades, exhaust, camshafts), it will feel underpowered compared to contemporary machines.

10. **Time-Consuming Maintenance**

Restoring or maintaining a Z1 requires mechanical skill and patience. Many owners spend significant time diagnosing and fixing issues, which may not be ideal for riders who prefer plug-and-play solutions.

---

### **Conclusion**

Buying a 1973 75 Kawasaki Z1 with a Keystone carburetor (or a Mikuni rebuild) is a rewarding but challenging endeavor. It s ideal for enthusiasts who appreciate classic motorcycles, enjoy working on their bikes, and prioritize heritage over modern convenience. The Z1 offers a unique blend of history, tunability, and community support, but it demands attention to detail, budgeting for repairs, and a willingness to compromise on comfort and safety features.

If you re looking for a **project bike** with long-term potential and don t mind spending time restoring it, the Z1 is an excellent choice. However, if you prefer a **ready-to-ride** machine with modern reliability and performance, a contemporary sportbike or a restored classic from a later era (e.g., 1980s ) may be a better fit.

---

### **Recommendation**

- **Buy if:** You have mechanical experience, enjoy restoration projects, and want a piece of motorcycle history with tunability. Budget for a **fully inspected bike** (engine, frame, suspension, electrical) and be prepared for ongoing maintenance. Prioritize models with **clean titles, no major rust, and a Mikuni carburetor rebuild** to avoid common pitfalls.

- **Avoid if:** You seek a hassle-free riding experience, lack mechanical skills, or want a bike that meets modern safety and comfort standards. Consider a **restored or lightly used Z1** (e.g., 1980s ) or a modern classic like a Suzuki GSX-R1000 if you want a balance of heritage and practicality.

- **Best Approach:** If you re serious about the Z1, **inspect it thoroughly** (or have a trusted mechanic do so) before purchasing. Focus on **engine condition, frame integrity, and electrical systems**. A Mikuni carburetor rebuild is a smart investment, but also consider upgrading the **ignition, suspension, and exhaust** for better reliability and performance.

Ultimately, the Z1 is a **passion project** rather than a practical daily rider. If you re in it for the love of the bike and the journey of bringing it back to life, it s an incredible experience. If you re looking for a straightforward, high-performance machine, modern alternatives may serve you better.

Details:

Set of 4 New Genuine Keyster Carburetor Rebuild Kits. Comes as you see in pics.

part #: k0084 prices

• $46.46-$74.95

specifications intakefuelmotorcycle:

• for models: Z1900, Z1, Z1b, 900
• for makes: Kawasaki
• for years: 1973-75
• mpn: K008-4
• part type: Carburetor
• oe/oem part number: 58-0068
• color: Orange
• material: Brass
• compatible year: 1973, 1974, 1975
• placement on vehicle: Rear
• country of origin: United States

offer intakefuelmotorcycle:

• quantity: 1
• options: Ship-to-home
• started: May 26, 2026
• sold: 0
• availability: In Stock

seller intakefuelmotorcycle:

• # reviews: 38345
• rating: 100.0%
• city: Springfield, Ohio

returns intakefuelmotorcycle:

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

general intakefuelmotorcycle:

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

payments intakefuelmotorcycle:

• money order
• wallet: Google-pay
• other
• cash
• credit card: Diners-club

shipping intakefuelmotorcycle:

• class: Standard
• type: Fixed
• transit: 4-10 Days
• service: USPS Ground Advantage
• carrier: USPS
• cost: $6.95

Kawasaki K008-4 Is Similar To:

• High Quality Carburetor Kawasaki Kx80 (31.1% similar) ATV go kart scooter UTV electric dirt bike motor sports vim round slide carburetor better quality best price guaranteed. Fits: kawasaki Suzuki Yamaha assembled in japan, china or us...(October 1st, 2017)
• 025-600 Sudco Kawasaki Triple Mikuni Carb Carburetor Rebuild Kits (45.3% similar) I also stock kits for h2 triples and h1 H1A as well hundreds of other carb virtually every vintage Japanese bike ever made. Each kit includes the following: choke plunger, plunger spring, needle, needle seat, seat gasket, bowl stock pilot jet, main next size up jet richer, clip, air screw, o-ring, ...(September 1st, 2018)
• 025-603 Mikuni Kawasaki Complete Vm Carb Carburetor Rebuild Frt (45.9% similar) I ship USPS and fed-ex ground only USA. Please visit. Another fine item brought to you by mid-Atlantic cycle, 194 west main st. I use USPS and fed-ex exclusively for shipping. I also stock kits for h1 KH500 and H1A b cf triples as well hundreds of other carb virtually every vintage Japanese bike ...(July 10th, 2018)
• 1003-1332 Parts Unlimited Carburetor Carb Rebuild Kit For Kawasaki Ex Ninja (45% similar) You are purchasing a new carburetor rebuild kit for the kawasaki EX250F 250R ninja...(November 29th, 2018)
• 11-4737 Supply Kawasaki Carburetor Intake Boot Set Of Mult Years (32.2% similar) K l this listing: 11-4737KAWASAKI part number for reference fitment: 1982 kawasaki KZ650 h2 h3 CSR 1983 CST 1984 KZ700 a1 a2 1980 KZ750 e1 e2 E31981 e3 1983 f1 ltd l3 h1 h4 LTD1981 LTD 1983 n1 n2 SPECTRE 1983 spectre r1 GP ZX750 a3 GPZ 1984 1985 TURBO 1985 turbo mobile phone buyers: ...(October 19th, 2018)
• Nos 15001-1086 Kawasaki Carburetor Kx60b1-b3 (32.6% similar) ...(November 18th, 2014)
• 15001-1393 Kawasaki Eliminator Carburetor Carb (38.2% similar) As with all used carburetors it should get a good cleaning and maybe rebuild...(March 8th, 2018)
• 15001-1923 Kawasaki Carburetor Keihin Pj Carb Banshee (34.8% similar) See pics for more detail. Good throttle included. M22 tb a2 13 Lt s. USSR Lt s. Its been cleaned and reassembled. Br table height 28PX middle face size 2 b its in good shape all around. A here to see all parts for this bike part was pulled from and is guaranteed fit 1994 KX500 an oem kawasaki ...(March 5th, 2018)
• 15001-2702 Kawasaki 150012702 Factory Carburetor 91 Genuine (47.2% similar) I will not do it. In some cases I have multiples of the same item so the image that you see may not be the exact one that you get, but all are inspected to ensure completeness and condition. The boxes and items may be dirty or dusty, also from storage display important if you are looking at a part ...(August 15th, 2014)
• 93 90 88 Vn1500 96 97 Carburetor 92 15002-1565 98 15002-1566 87 89 Kawasaki 9 95 94 Carbs Vulcan 91 (29.3% similar) They may need cleaning, but should just bolt on and go. Review the pictures carefully VN1500 a7 Vulcan VN1500 a7 Vulcan 88 original oem carbs front rear set part numbers these are original oem parts from a 1993 Vulcan width 1 height body. I try to ship the next day. I prefer to ship via USPS ...(July 26th, 2014)
• 15003-1408 Kawasaki 1999 Zx6r 600 Ninja Carburetor Assembly (41.7% similar) Used 1999 kawasaki ZX6R 600 ninja carburetor assembly coming off a bike that has been stored for the past 7 years...(January 3rd, 2016)