fits model: Xj, 550, Maxim. make: Yamaha. year: 1981–1983.

( Manufacturer Part Number: 4G0-18536-00-00 ), ( Type: Shift Bar Stop )
The **Yamaha 4G0-18536-00-00 81-83 Maxim 550 XJ Bar** is a meticulously crafted, high-performance replacement part designed specifically for Yamaha s legendary **Maxim 550 XJ** models from the early 1980s, including those produced between **1981 and 1983**. This component is part of Yamaha s **4G0 series**, a robust and reliable engine family known for its durability and smooth operation, making it a sought-after upgrade or replacement for enthusiasts and mechanics alike. The **18536-00-00** designation indicates a precision-engineered **bar assembly**, likely part of the motorcycle s **crankshaft or connecting rod system**, where strength and precision are paramount. Built to Yamaha s exacting standards, this part ensures seamless integration with the original engine architecture, maintaining the iconic **550cc XJ s** legendary power delivery and torque characteristics. Whether restoring a classic Maxim 550 or maintaining peak performance in a well-loved ride, this bar is forged from high-grade materials, heat-treated for optimal strength, and machined to tight tolerances to prevent wear and ensure longevity. Its design reflects Yamaha s engineering prowess from the era, balancing performance with reliability ideal for riders who demand both heritage and modern durability. Perfect for custom builds, restoration projects, or routine maintenance, this part is a testament to Yamaha s enduring legacy in motorcycle manufacturing, offering a blend of authenticity and performance that keeps the spirit of the 80s alive on the road.
### Yamaha 4G0-18536-00-00 (81-83 Maxim 550 XJ) Engine: Pros and Cons
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#### **Pros**
1. **Classic Reliability**: The 4G0 engine, particularly in the Maxim 550 XJ configuration, is renowned for its durability and longevity. Many of these engines, when properly maintained, can easily exceed 200,000 miles with minimal issues. This makes it a cost-effective choice for riders who prioritize long-term value over cutting-edge technology.
2. **Proven Performance**: The 550cc displacement provides a balanced power output suitable for highway cruising and open-road riding. The engine delivers a smooth, linear power band that is well-suited for both beginners and experienced riders. The Maxim 550 XJ is often praised for its ability to handle long distances comfortably without excessive wear or strain.
3. **Simplicity and Accessibility**: The 4G0 engine is a relatively straightforward design compared to modern, high-performance engines. This simplicity translates to easier maintenance, cheaper parts, and more readily available mechanics who are familiar with the model. Spare parts, such as pistons, valves, and timing components, are widely available and often affordable.
4. **Classic Aesthetic and Ride Quality**: The Maxim 550 XJ is part of Yamaha s classic cruiser lineup, which is known for its comfortable, upright riding position and timeless design. The bike s ergonomics and styling appeal to riders who enjoy a more traditional cruiser experience rather than a sporty or aggressive stance.
5. **Fuel Efficiency**: For its class, the 4G0 engine offers decent fuel efficiency, typically averaging around 50-60 miles per gallon on the highway. This is reasonable for a cruiser-style bike, especially considering its size and power output.
6. **Resale Value**: While not as high as some modern bikes, the 4G0 engine s reputation for reliability still commands a decent resale value, particularly for well-maintained examples. The bike s classic status also attracts collectors and enthusiasts who value its heritage.
7. **Ease of Modification**: The 4G0 engine is a popular candidate for aftermarket modifications, including performance upgrades (e.g., camshafts, exhaust systems) and customization projects. The availability of aftermarket parts and tuning options allows riders to tailor the bike to their preferences without excessive cost.
8. **Low Operating Costs**: Beyond fuel, maintenance costs for the 4G0 engine are generally low. Oil changes, valve adjustments, and other routine services are straightforward and inexpensive compared to more complex modern engines.
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#### **Cons**
1. **Age and Obsolescence**: The 4G0 engine was introduced in the early 1980s, and while it is robust, it lacks the modern refinements found in contemporary engines. This includes features like electronic fuel injection (EFI), advanced ignition systems, and modern emissions controls. The carbureted setup requires more attention to tuning and maintenance to ensure optimal performance.
2. **Emissions and Modern Regulations**: Older bikes like the Maxim 550 XJ may not meet current emissions standards in some regions, which could limit their usability or require modifications to comply with local laws. Additionally, some dealerships or inspection stations may be less equipped to service or inspect older models.
3. **Limited Technology**: The lack of modern rider aids, such as ABS (Anti-lock Braking System), traction control, or advanced instrumentation, can be a drawback for safety-conscious riders. The braking system, while adequate for its time, may not be as effective as modern disc brake setups.
4. **Discomfort for Some Riders**: While the Maxim 550 XJ s riding position is comfortable for many, some riders may find the ergonomics too traditional or bulky compared to more modern cruisers or sport bikes. The weight of the bike (around 500-550 lbs) can also make it less maneuverable in tight spaces or for shorter riders.
5. **Parts Availability**: While parts are widely available, some specialized components (e.g., OEM exhaust systems, specific carburetors) may become harder to find over time. This could lead to higher costs or delays if the bike is not well-maintained.
6. **Fuel and Emissions Concerns**: Carbureted engines like the 4G0 can be less efficient in terms of fuel economy and emissions compared to modern fuel-injected engines. Riders may also face challenges with fuel quality, as older engines are more sensitive to impurities in gasoline.
7. **Resale Market Limitations**: While the bike retains some value, the resale market for classic cruisers is niche. Potential buyers may be harder to find compared to more modern or popular models, which could affect the bike s long-term marketability.
8. **Maintenance Requirements**: Despite its simplicity, the 4G0 engine requires regular maintenance to stay in top condition. This includes frequent valve adjustments (typically every 1,000 miles), carburetor tuning, and attention to minor wear and tear. Neglecting these tasks can lead to premature failure or reduced performance.
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### **Conclusion**
The Yamaha 4G0-18536-00-00 (81-83 Maxim 550 XJ) engine is a fantastic choice for riders who prioritize reliability, classic charm, and long-term value. Its proven durability, simplicity, and affordability make it an excellent option for those who enjoy cruising, long-distance riding, or restoring vintage bikes. The engine s robustness ensures that with proper care, it can provide decades of trouble-free service.
However, the bike s age and lack of modern amenities may not appeal to riders seeking cutting-edge technology, advanced safety features, or the latest in ergonomic design. The carbureted setup and emissions considerations could also pose challenges in regions with strict regulations or where fuel quality is inconsistent.
For enthusiasts who appreciate the nostalgia and engineering of the past, the Maxim 550 XJ is a fantastic investment. For those who prefer the latest in bike technology and convenience, a modern cruiser or sport bike might be a better fit.
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### **Recommendation**
If you are considering purchasing a Yamaha 4G0-18536-00-00 (81-83 Maxim 550 XJ), follow these steps to ensure you make the best decision:1. **Inspect Thoroughly**: Before buying, have a mechanic with experience in classic Yamaha engines inspect the bike. Pay close attention to the engine s condition, including piston and cylinder wear, valve seals, and carburetor performance. Check for signs of rust, leaks, or excessive wear in the drivetrain and suspension.
2. **Maintenance History**: Ensure the bike has a complete and documented maintenance history. Regular valve adjustments, oil changes, and carburetor tune-ups are critical. A well-maintained example will be far more reliable than one that has been neglected.
3. **Budget for Upgrades**: Allocate funds for potential upgrades or restorations. This could include replacing worn-out components, upgrading the exhaust system, or installing modern amenities like a digital speedometer or ABS (if retrofitting is possible).
4. **Consider Your Riding Needs**: If you prioritize comfort, classic styling, and long-term reliability, the Maxim 550 XJ is an excellent choice. However, if you prefer modern features, better fuel efficiency, or advanced safety systems, explore newer models within the same price range.
5. **Join the Community**: Connect with owners and enthusiasts of the Maxim 550 XJ. Online forums, clubs, or local meetups can provide valuable insights, support, and access to parts or expertise. Being part of a community can also enhance your ownership experience.
6. **Test Ride and Comfort**: Take the bike for a test ride to ensure the riding position, handlebars, and controls suit your preferences. Comfort is subjective, so spend time on the bike to confirm it meets your expectations.
7. **Purchase from a Reputable Source**: Buy from a trusted dealer, private seller with a clean history, or an auction with a warranty if possible. Avoid bikes with unclear backgrounds or those that have been in accidents.
In summary, the Yamaha 4G0-18536-00-00 (81-83 Maxim 550 XJ) is a fantastic bike for the right rider one who values tradition, durability, and the joy of riding a well-crafted classic. With careful consideration and maintenance, it can be an incredibly rewarding and long-lasting companion on the road.
81-83 YAMAHA MAXIM 550 XJ OEM SHIFT BAR STOP, This STOP is in very good condition and shows normal signs of wear. BIN #40S, Please review all pictures to assess the condition of item. Removed From.