BMW 64-32-11 Carburetor 64/32/11 R90/6 R90S R75/6 R75/5 /7

( Manufacturer Part Number: 64/32/11 ), ( Part Type: Carburetor ), ( Compatible Year: 1976, 1974 ), ( Country Of Origin: Germany )

Review BMW 64/32/11 R90/6 Carburetor 64 32 R75/6 R75/5 /5 /6 /7 fits R90 R75 R100 2011

The BMW R90/6, R90S, R75/5, R75/6, R75/7, and R100 motorcycles represent a legendary era of German engineering, blending raw performance with timeless elegance. At the heart of these iconic machines lies the legendary **BMW Boxer engine**, a horizontally opposed twin-cylinder powerplant renowned for its smoothness, durability, and distinctive sound. The **64/32 carbureted models** including the R90/6 (1973 1983), R90S (1975 1983), R75/5 (1955 1969), R75/6 (1969 1974), R75/7 (1974 1975), and R100 (1975 1981) all share a common mechanical foundation, though refined over decades to meet evolving performance demands. The **R90/6** and **R100** stand out as the most advanced of this lineup, featuring a **64mm carburetor** (paired with a **32mm pilot jet**) for a balanced blend of throttle response and fuel efficiency, while the earlier **R75/5 and R75/6** models relied on a slightly smaller **32mm carburetor**, offering a more restrained yet still exhilarating ride.

The **BMW 64/32 carburetor** itself is a masterpiece of mechanical simplicity and precision, featuring a **single Solex or Dell Orto carburetor** (depending on the model) that delivers a rich, throaty exhaust note while maintaining excellent low-end torque. The **R90S**, in particular, is celebrated for its **1,000cc displacement** and **75 horsepower** output, making it one of the most powerful production motorcycles of its time, while the **R75/5 and R75/6** with their **695cc engines** offer a more approachable yet still spirited alternative. The **R90/6 s** **1973 1983 production run** saw subtle refinements, including improved fuel injection (on later models) and a more aggressive camshaft profile, but the carbureted versions remain the most sought-after for their raw, unfiltered character.

Mechanically, these BMWs share a **boxer engine** with a **90-degree crankshaft**, producing a near-perfect balance that eliminates vibration and delivers a silky-smooth power delivery. The **64/32 carburetor setup** ensures a perfect mix of air and fuel, with the **64mm main jet** providing ample power for cruising and overtaking, while the **32mm pilot jet** fine-tunes idle and low-speed performance. The **R90S s** **compression ratio of 8.5:1** allows for a more aggressive tune, whereas the **R75/5 and R75/6** (with a **7.5:1 ratio**) offer a more forgiving, everyday-ready experience. The **R100**, introduced in 1975, introduced a **1,000cc engine** with a **75mm carburetor** (though some early models retained the 64/32 setup), making it the most powerful of the carbureted BMWs before BMW transitioned to fuel injection in the late 1980s.

Beyond the engine, these motorcycles feature a **full cradle frame** with **dual rear shocks** and **hydraulic telescopic forks**, providing a stable yet nimble riding position. The **R90S** and **R100** benefit from a slightly longer wheelbase, enhancing stability at high speeds, while the **R75/5 and R75/6** offer a more compact, agile feel. The **BMW 64/32 carburetor** is not just about raw power it s about **character**, with a **distinctive exhaust note** that grows louder as RPMs climb, rewarding the rider with a sense of connection to the machine. Whether cruising along a scenic highway or carving through a twisty backroad, these motorcycles deliver an unmatched blend of **smoothness, reliability, and soul**.

For enthusiasts seeking authenticity, the **64/32 carbureted BMWs** remain the gold standard, offering a **nostalgic yet modern** riding experience. The **R90/6, R90S, and R100** are particularly prized for their **high-performance potential**, with aftermarket support ranging from **carburetor upgrades** to **exhaust modifications** that enhance their already impressive sound and power. Meanwhile, the **R75/5 and R75/6** provide a more accessible entry into BMW s classic era, proving that even smaller displacements can deliver an unforgettable ride. Whether restored to showroom condition or left in classic vintage form, these motorcycles embody **German engineering at its finest**, blending **timeless design with mechanical brilliance** in a way that few other bikes can match.

### **Pros and Cons of Buying a Classic BMW Airhead (R90/6, R75/7, R100, etc.) with Carburetor Engines**

#### **Overview**

The BMW Airhead series (R90/6, R75/7, R75/5, R75/6, R100, R100RS, R100RT, R90S, R90/6, etc.) are iconic motorcycles from the 1960s and 1970s, known for their boxer-twin engines, classic styling, and strong following among enthusiasts. These bikes were originally built with carbureted engines, though many have since been converted to fuel injection. Below is a detailed breakdown of their advantages and disadvantages.

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### **Pros**

1. **Classic Design and Aesthetics**

- The Airheads are instantly recognizable with their timeless, retro styling. The boxer-twin engine layout and classic BMW branding give them a strong visual appeal.

- The ergonomics and riding position are comfortable for long rides, with a relaxed posture that appeals to both cruisers and touring enthusiasts.

2. **Strong Engine Character**

- The boxer-twin engine is one of the most distinctive in motorcycle history. Its flat, smooth power delivery and deep, resonant exhaust note make it highly enjoyable to ride.

- The carbureted engines (especially the later models with 2x 34mm or 36mm carburetors) produce a classic, throaty sound that many riders find more satisfying than modern, quieter engines.

3. **Proven Reliability (With Proper Maintenance)**

- When well-maintained, Airheads are surprisingly durable. Many original examples still run strong after decades, especially if they have been regularly serviced.

- The simplicity of the carbureted engine (compared to modern fuel-injected systems) means fewer electronic components to fail, though carburetors themselves require tuning and adjustment.

4. **Modification Potential**

- The Airhead platform is highly modifiable. Aftermarket parts, performance upgrades, and customization options are widely available, ranging from simple carburetor tuning to full engine rebuilds.

- The engine can be easily upgraded with larger carbs (e.g., Dell Orto PHH 38mm or 40mm), high-performance exhausts, or even fuel injection conversions (though this reduces originality for purists).

5. **Strong Community and Support**

- There is a large, active community of Airhead enthusiasts, with clubs, forums (e.g., BMW Motorrad Forum, ClassicBMW.com), and meetups dedicated to these bikes.

- Parts and service manuals are widely available, and many mechanics specialize in Airheads, making repairs and maintenance more accessible.

6. **Touring Capabilities (For Later Models)**

- The R100RS and R100RT were designed as touring bikes with comfortable saddlebags, windshields, and long-range fuel capacity. These models are still capable of long-distance riding with proper maintenance.

- The R90S and R90/6 are also capable of touring, though they lack some of the modern conveniences of the R100RS.

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

- Fuel and insurance costs are generally lower than for modern sportbikes or cruisers, though this varies by region.

- Basic maintenance (oil changes, chain adjustments) is relatively inexpensive, though carburetor tuning and valve adjustments require skill.

8. **Nostalgia and Collectibility**

- For many riders, owning an Airhead is about the history and legacy of BMW motorcycles. Some models (e.g., early R90/6s, R75/7s) are highly sought after by collectors.

- The bikes hold sentimental value for those who grew up with them or appreciate classic motorcycle culture.

---

### **Cons**

1. **High Maintenance Requirements**

- Carbureted engines require regular tuning to maintain optimal performance. Carbs can clog, drift, or develop leaks, requiring frequent adjustments or replacements.

- The valve adjustment must be done every 1,000 2,000 miles (or as recommended by the manufacturer) to prevent excessive wear. This is a skill that many riders must learn or pay a mechanic to perform.

- The engine s simplicity is also a double-edged sword there are fewer "fail-safes" in the design, meaning issues like seized valves or piston problems can be catastrophic if not caught early.

2. **Reliability Issues with Age**

- Worn camshaft lobes or lifters.

- Leaking head gaskets or cylinder head cracks (common in R90/6s and R75/7s).

- Transmission wear, particularly in the R75/7 and R75/5 models.

- Suspension components (forks, shock absorbers) that may need replacement.

- Rust can be an issue in older bikes, particularly in the frame, swingarm, or exhaust system, depending on storage conditions.

3. **Performance Limitations**

- The stock carbureted engines are not particularly powerful by modern standards. The R90/6 and R75/7 produce around 50 60 hp, while the R100RS and R100RT are slightly more powerful (around 65 70 hp).

- The powerband is narrow, and the bikes can feel sluggish at low RPMs. While modifications can improve performance, they also increase maintenance complexity.

- The carbureted setup is less efficient than modern fuel injection, leading to poorer fuel economy and more frequent tuning needs.

4. **Comfort and Modern Ergonomics**

- While the riding position is comfortable, the bikes lack modern ergonomics such as adjustable seats, handlebars, or footpegs. Some riders find the stock setup too rigid or outdated.

- The suspension is basic by today s standards, with limited adjustability. Modern touring bikes offer far superior comfort for long rides.

5. **Legal and Practical Challenges**

- **Noise Levels:** Many Airheads exceed modern noise regulations, especially if they have stock exhausts. Aftermarket mufflers or silencing systems are often required to pass emissions or noise laws.

- **Insurance:** Insuring an Airhead can be expensive, particularly for older or high-mileage examples. Some insurers may also require additional documentation or modifications to approve coverage.

- **Parts Availability:** While parts are widely available, some rare or original components (e.g., specific carburetors, OEM suspension) can be difficult or expensive to source, especially for older models.

- **Road Legality:** Some countries or states have restrictions on classic bikes, requiring registration as "historic" vehicles or modifications to meet modern safety standards (e.g., ABS, lighting).

6. **Fuel and Emissions Concerns**

- Carbureted engines are less efficient with modern fuels, which often contain higher ethanol content. This can lead to carburetor icing, tuning issues, or poor performance.

- Some regions have restrictions on carbureted bikes due to emissions concerns, though many Airheads are grandfathered in as classics.

7. **Resale Value and Depreciation**

- While well-maintained Airheads hold value, they generally depreciate faster than modern bikes. The market for classics can be unpredictable, and finding a buyer may take time.

- Restored or high-mileage examples depreciate more quickly than those in original condition or with original documentation.

8. **Learning Curve for Ownership**

- Owning an Airhead requires a willingness to learn about carburetor tuning, valve adjustments, and basic mechanical skills. Many riders find themselves spending significant time maintaining the bike.

- Finding a knowledgeable mechanic who specializes in Airheads can be challenging in some areas, increasing the risk of poor repairs or advice.

---

### **Conclusion**

Buying a BMW Airhead is a rewarding experience for those who appreciate classic motorcycles, enjoy mechanical challenges, and value the unique character of these bikes. They offer a blend of nostalgia, riding pleasure, and modifiable potential that modern bikes cannot match. However, they also come with significant maintenance demands, reliability concerns, and practical limitations that may not suit everyone.

- Riders who enjoy tinkering and mechanical work.

- Those who prioritize aesthetics, sound, and the classic BMW experience over raw power or modern conveniences.

- Enthusiasts who appreciate the history of motorcycle engineering and are willing to invest time in maintenance.

- People who plan to use the bike for leisurely rides, club runs, or as a project rather than daily commuting or high-speed touring.

- Riders who want a "set-and-forget" bike with minimal maintenance.

- Those seeking high performance, modern ergonomics, or advanced safety features (e.g., ABS, traction control).

- People who prioritize fuel efficiency, low insurance costs, or easy parts availability.

- Buyers who want a bike that holds value easily or is simple to resell.

---

### **Recommendation**

- For beginners, the **R100RS** is a great choice due to its touring capabilities, slightly more powerful engine, and better parts availability.

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Details:

The diaphragm does not leak. Carburetor looks to be in good usable condition. It was removed from a R90/6 that running bike until the owner started full restoration never got finished. Comes as pictured.

part #: 643211 prices

• $103.74-$229.99

specifications cyclevintagee:

• for models: R90, R75, R100
• for makes: Bmw
• for years: 2011
• mpn: 64/32/11
• part type: Carburetor
• compatible year: 1976, 1974
• country of origin: Germany

seller cyclevintagee:

• rating: 100.0%
• city: Oklahoma City, Oklahoma
• # reviews: 1013

shipping cyclevintagee:

• type: Fixed
• class: Standard
• cost: $19.99
• service: USPS Ground Advantage
• transit: 4-9 Days
• carrier: USPS

offer cyclevintagee:

• availability: In Stock
• quantity: 1
• best offers: True
• started: May 2, 2026
• sold: 0
• options: Ship-to-home

payments cyclevintagee:

• other
• wallet: Paypal
• credit card: Discover

returns cyclevintagee:

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

general cyclevintagee:

• condition: Used
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