BMW 46711451426 Cylinder Bars R50-R100 L/h

( Manufacturer Part Number: 46711451426 ), ( Part Type: Cylinder Bar ), ( Finish: Chrome ), ( Country Of Origin: Germany ), ( Placement On Vehicle: Left )

Review BMW Oem Motorcycle L/h Chrome Cylinder Protection Crash Bars fits 1970-95

The **BMW 46711451426** is a meticulously engineered cylinder bar assembly designed exclusively for BMW s legendary **R50, R60, R60S, R75/5, R80, R80GS, R100, and R100GS** motorcycles produced between **1970 and 1995**. This critical component forms the backbone of the engine s **air-cooled, twin-cylinder (R50/R60) or boxer-twin (R75/5, R80, R100) layouts**, ensuring precise valve timing, optimal combustion efficiency, and long-term durability. Crafted from high-grade **cast iron or forged steel**, depending on the specific application, these cylinder bars are precision-machined to BMW s original tolerances, guaranteeing seamless integration with the **camshaft, rocker arms, and valve springs** while maintaining the iconic performance and reliability that defined these classic bikes.

The **46711451426** is a **direct replacement** for the original BMW cylinder bar, eliminating the need for costly modifications or aftermarket compromises. Its design incorporates **interference-fit bearings** or **sleeve bearings**, depending on the model, to minimize friction and wear, ensuring smooth operation even under high-RPM conditions critical for maintaining the raw, unfiltered power of these air-cooled engines. For **R50/R60 models**, the cylinder bar interfaces with the **single overhead camshaft (SOHC)**, while the **R75/5, R80, and R100** versions feature a **dual overhead camshaft (DOHC) boxer layout**, requiring a slightly different but equally precise bar configuration to accommodate the **pushrods and rocker assemblies**. Whether restoring a **vintage R60GS** or upgrading a **high-mileage R100RT**, this part is essential for restoring factory performance and extending engine life.

Beyond its mechanical function, the **46711451426** plays a pivotal role in preserving the **authentic character** of BMW s classic air-cooled engines. Unlike modern OEM or aftermarket alternatives, this component adheres to BMW s **original engineering standards**, ensuring compatibility with stock **pistons, crankshafts, and cylinder heads** without the need for additional gaskets, spacers, or alignment adjustments. Its **precision-ground surfaces** and **laser-checked dimensions** prevent common issues like **valve float, excessive camshaft wear, or premature bearing failure**, which are often seen in modified or low-quality replacements. For enthusiasts seeking **restomod authenticity** or those performing a **full engine rebuild**, this cylinder bar is an indispensable part of achieving **factory-spec performance** while future-proofing the engine against the stresses of modern riding conditions.

Available in **new OEM-quality** or **reconditioned** forms, the **46711451426** is a **direct-fit solution** that eliminates the guesswork of sourcing parts from obscure European suppliers or risking compatibility issues with generic aftermarket alternatives. Whether installed in a **showroom-worthy restoration** or a **high-performance street/touring bike**, this component ensures that the **timing, balance, and efficiency** of the engine remain true to BMW s original design intent. For mechanics and riders who demand **precision, reliability, and the unmistakable growl of an air-cooled BMW**, the **46711451426 cylinder bar** is the definitive choice bridging the gap between vintage engineering and modern performance with uncompromising accuracy.

### **Pros and Cons of Buying a BMW R50/R100 (1970 1995) with a Modified Cylinder Bar (Part Number: BMW 46711451426)**

#### **Pros**

1. **Classic Design and Prestige**

The BMW R50/R100 is an iconic motorcycle, revered for its timeless styling, engineering, and cultural significance. Owning one provides a sense of heritage and exclusivity, appealing to collectors and enthusiasts.

2. **Strong Engine and Performance Potential**

The air-cooled, twin-cylinder boxer engine (R50) or the more powerful R100 (1000cc) is legendary for its smoothness, durability, and modding potential. With the correct cylinder bar (46711451426), you can restore or enhance performance, especially if the original bar was worn or damaged.

3. **Modding and Customization Opportunities**

BMW s classic bikes are highly modifiable. The cylinder bar replacement allows for better valve train alignment, improved compression, and potential power gains. Aftermarket parts (cams, pistons, headers) can further enhance performance.

4. **Reliability and Longevity**

When properly maintained, these bikes are known for lasting decades. The boxer engine is robust, and with a fresh cylinder bar, you can extend its lifespan significantly.

5. **Community and Support**

A large global community exists for BMW R50/R100 owners, offering parts, restoration advice, and group rides. This makes maintenance and modifications easier to source.

6. **Resale Value for Well-Maintained Examples**

Restored or well-preserved R50/R100s hold value, especially in the classic motorcycle market. A properly maintained bike with a new cylinder bar can be a sound investment.

7. **Riding Experience**

The ergonomics, handling, and open-air riding experience remain unmatched for their era. The R100, in particular, offers a comfortable, stable ride even at highway speeds.

---

#### **Cons**

1. **High Maintenance Costs**

These bikes require frequent upkeep valve adjustments, chain tensioning, carburetor tuning, and general wear-and-tear issues (e.g., leather parts, electrical systems) add up. A cylinder bar replacement is a good step, but other components (crankshaft, pistons, bearings) may still need attention.

2. **Parts Availability and Cost**

While aftermarket parts exist, some original components (especially for older models) can be expensive or difficult to find. The cylinder bar (46711451426) itself is a relatively common part, but labor costs for installation can be high.

3. **Rust and Corrosion Risks**

Many older R50/R100s suffer from rust, particularly in the frame, fuel tank, and suspension components. A thorough inspection is critical before purchase.

4. **Electrical System Reliability**

The wiring harnesses and ignition systems in these bikes are prone to failure. Modernizing the electrical system (e.g., with aftermarket components) may be necessary for reliability.

5. **Weight and Handling Limitations**

The R100 is heavier than modern bikes, and the R50 s smaller engine means it s less capable on highways. The bike s weight and rigid frame make it less forgiving on rough roads compared to modern suspension setups.

6. **Fuel and Emissions Concerns**

Carbureted engines are less efficient than modern fuel-injected bikes, leading to higher fuel consumption. Some regions have restrictions on older bikes, though this is less of an issue for private use.

7. **Potential for Hidden Mechanical Issues**

Even with a new cylinder bar, other parts (crankshaft, connecting rods, bearings) may be worn. A pre-purchase inspection by a BMW specialist is highly recommended to avoid costly surprises.

8. **Insurance and Registration Challenges**

Classic bikes often have higher insurance premiums due to their value and parts cost. Some regions may require additional inspections or modifications to register them legally.

---

### **Ending Conclusion**

The BMW R50/R100 is a fantastic motorcycle for enthusiasts who appreciate classic design, engineering, and the joy of riding a piece of history. The cylinder bar replacement (46711451426) is a wise investment if the original was damaged or worn, as it improves engine reliability and performance potential. However, these bikes demand significant time, money, and mechanical knowledge to keep them running smoothly.

If you re prepared for the maintenance challenges, enjoy tinkering, and value the riding experience over modern convenience, an R50/R100 is an excellent choice. If you re looking for a low-maintenance, high-performance bike, a modern motorcycle would be a more practical option.

---

### **Recommendation**

- You have mechanical experience or access to a trusted mechanic.

- You re willing to invest in restoration and maintenance.

- You prioritize the classic BMW experience over modern convenience.

- The bike has been thoroughly inspected (engine, frame, electrical system).

- You re okay with higher fuel and insurance costs.

- You want a bike that requires minimal upkeep.

- You re not prepared for the cost of parts and labor.

- You plan to ride long distances frequently (modern bikes are more efficient).

- The bike lacks documentation or has obvious rust/wear issues.

**Final Advice:** Always get a professional inspection before purchasing, and consider starting with a well-documented, restored example if you re new to these bikes. If you re committed to the project, the R50/R100 will reward you with decades of enjoyable riding.

Details:

part #: 46711451426 prices

• $24.99-$175.00

specifications mocycfra:

• for makes: Bmw
• for years: 1970-95
• mpn: 46711451426
• part type: Cylinder Bar
• finish: Chrome
• country of origin: Germany
• placement on vehicle: Left

shipping mocycfra:

• carrier: USPS, UPS
• service: USPS Ground Advantage, UPS Ground Saver
• type: Calculated
• transit: 9-15 Days
• cost: $19.50
• class: Standard, Economy

payments mocycfra:

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

returns mocycfra:

• policy: No Returns

general mocycfra:

• Motorcycle Scooter Parts Accessories > Body Frame > Frames Parts
• condition: Used

seller mocycfra:

• # reviews: 87
• city: Hershey, Pennsylvania
• rating: 100.0%

offer mocycfra:

• options: Ship-to-home
• started: April 3, 2026
• availability: In Stock
• sold: 0
• quantity: 1

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