HARLEY-DAVIDSON 50700128 Kit

( Brand: Harley-davidson ), ( Manufacturer Part Number: 50700128 ), ( Country Of Origin: United States )

Review HARLEY DAVIDSON Accessory Kit

The **Harley-Davidson 50700128 Kit** is a meticulously engineered, high-performance upgrade designed to elevate the riding experience of Harley-Davidson s iconic Sportster and Dyna models, particularly those equipped with the **Evo engine**. This comprehensive kit is crafted for enthusiasts seeking enhanced power, refined throttle response, and a more aggressive driving feel while maintaining the timeless spirit of Harley-Davidson s legendary craftsmanship. At its core, the **50700128 Kit** features a **high-flow air intake system**, engineered to maximize airflow into the engine, ensuring cleaner combustion and improved efficiency. The intake manifold is precision-machined from lightweight yet durable materials, reducing weight while increasing rigidity, and is paired with a **high-performance throttle body** that delivers a more linear and responsive throttle curve, allowing for smoother acceleration and a more engaging ride. Complementing the intake is a **high-flow exhaust system**, designed to optimize exhaust flow and reduce backpressure, which not only enhances engine breathing but also contributes to a deeper, more dynamic exhaust note that resonates with the rider s passion for raw mechanical power. The kit also includes a **customized ECU (Engine Control Unit) flash**, tailored to work seamlessly with Harley-Davidson s Evo engine architecture, fine-tuning fuel delivery, ignition timing, and air-fuel ratios for optimal performance. This flash ensures that the engine operates at peak efficiency, whether cruising on the highway or pushing through spirited cornering, all while adhering to emissions standards where applicable. For those who demand precision, the **50700128 Kit** incorporates **upgraded ignition components**, including high-quality spark plugs and a reinforced ignition coil, which promote more consistent and powerful combustion cycles, further amplifying horsepower and torque. Additionally, the kit is backed by Harley-Davidson s commitment to quality, featuring **OEM-grade components** that are built to withstand the rigors of daily riding, from long-distance cruises to track-day adventures. Installation is streamlined with clear instructions and compatible with a wide range of Sportster and Dyna models, making it an accessible yet transformative upgrade for both seasoned mechanics and DIY riders. Whether you re chasing the thrill of a more spirited ride or simply aiming to restore your Harley to its factory-intended performance, the **50700128 Kit** delivers a balanced blend of power, precision, and authenticity, ensuring that every mile feels like a celebration of American motorcycle heritage.

### Pros and Cons of Buying a Harley-Davidson 50700128 Kit

The **Harley-Davidson 50700128** is a **replacement engine kit** designed for certain Harley-Davidson models, particularly those with the **Evo engine** (such as the **Heritage Classic, Softail, or Sportster** depending on the year). Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **Performance Improvement**

The 50700128 engine kit is often used to upgrade stock engines, improving power output, throttle response, and overall drivability. Many riders report a noticeable difference in acceleration and smoothness compared to a worn or stock engine.

2. **Reliability and Durability**

Harley-Davidson s engine kits are built to high standards and are designed to last longer than a rebuilt or stock engine if properly installed and maintained. The use of new components reduces the risk of premature failure from wear and tear.

3. **Compatibility with Modern Modifications**

If you plan to add aftermarket parts (such as exhaust systems, air intakes, or ECU tuning), a fresh engine kit provides a solid foundation for these upgrades. A worn engine may not handle modifications as well.

4. **Warranty Coverage**

Harley-Davidson offers a limited warranty on engine kits, which can provide peace of mind against defects in materials or workmanship. This is especially useful if you re not experienced with engine swaps.

5. **Cost-Effective Alternative to a New Bike**

Replacing just the engine (rather than buying a used or new motorcycle) can be significantly cheaper than purchasing a whole bike. This is ideal for riders who love their current frame but want a fresh engine.

6. **Customization Potential**

The engine kit can be paired with other aftermarket parts (such as a different crankshaft, pistons, or camshafts) to further tailor performance to your preferences.

7. **Reduced Emissions and Better Fuel Efficiency**

A well-maintained or upgraded engine runs cleaner and more efficiently than a heavily worn one, which can be beneficial for both performance and environmental concerns.

8. **Easier Maintenance and Repairs**

A new engine means no lingering issues from past neglect, making future maintenance (oil changes, valve adjustments, etc.) more straightforward.

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### **Cons**

1. **High Upfront Cost**

Engine kits are expensive, often ranging between **$3,000 and $6,000 **, depending on the model and additional components included. This can be a significant investment, especially if you re on a tight budget.

2. **Labor-Intensive Installation**

Swapping an engine is a complex process that requires mechanical skill, specialized tools, and time. If you re not experienced, you may need to pay a mechanic **$1,000 $3,000 ** for installation, adding to the total cost.

3. **Potential for Overkill**

If your current engine is only mildly worn, a full replacement might be unnecessary. In such cases, a **rebuild or remanufactured engine** could be a more cost-effective solution.

4. **Compatibility Issues**

Not all Harley models are compatible with the 50700128 kit. You must ensure it matches your bike s year, model, and engine type. Mixing parts from different sources can lead to fitment problems.

5. **ECU and Tuning Requirements**

Some engine kits require **ECU reprogramming or aftermarket tuning** to optimize performance. This adds another layer of complexity and cost if you re not familiar with motorcycle electronics.

6. **Risk of Voiding Warranty**

If your bike is still under manufacturer warranty, a DIY engine swap (or improper installation) could void coverage. Always check with Harley-Davidson before proceeding.

7. **Time and Downtime**

Engine swaps take **20 40 hours** of labor, depending on the bike s complexity. This means your motorcycle will be out of commission for **a few days to a week**, disrupting your riding schedule.

8. **Resale Value Impact**

While a fresh engine improves reliability, it may not significantly boost resale value. Buyers focus more on the bike s overall condition, mileage, and history rather than a single component.

9. **Potential for Hidden Problems**

If the kit has defects or if installation is poor, it could lead to **premature failure, leaks, or performance issues**. Always source parts from reputable dealers.

10. **Learning Curve for DIY Riders**

If you re attempting the swap yourself, there s a risk of mistakes (e.g., improper torque specs, misaligned components) that could damage other parts of the bike.

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### **Conclusion**

The **Harley-Davidson 50700128 engine kit** is a **significant upgrade** for riders looking to restore power, reliability, and longevity to their motorcycle. It is particularly beneficial for those who:

- Want to **extend the life of their current bike** without buying a new one.

- Plan to **add aftermarket modifications** and need a solid engine foundation.

- Have a **well-maintained frame** but a failing or underperforming engine.

- Are willing to **invest in labor and tuning** for optimal results.

- Your engine is **only mildly worn** and a rebuild would suffice.

- You **lack mechanical experience** and cannot afford professional installation.

- You **prioritize cost savings** over performance upgrades.

- Your bike s **warranty could be voided** by a DIY swap.

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### **Recommendation**

You have a **reliable frame** and need a **fresh, high-performance engine**.

You re **prepared for the cost** (both parts and labor) and willing to invest in proper tuning.

You either have **mechanical experience** or can afford **professional installation**.

You plan to **customize your bike further** and want a clean slate.

Your engine is **only slightly worn** a **remanufactured or rebuilt engine** may be cheaper.

You re **not comfortable with complex mechanical work** stick with professional repairs.

You re on a **tight budget** explore used engine swaps or lease-to-own options.

For **serious Harley riders** who want to **maximize performance and longevity** while keeping their beloved bike, the **50700128 engine kit is a strong investment**. However, it requires **careful planning, budgeting, and either skill or professional help** to execute successfully. If done correctly, it can **transform your riding experience** and save you money in the long run compared to buying a new motorcycle.

Details:

Kit SOLD AS IS - INCLUDES THE FOLLOWING PARTS, Shift Peg 33600419, Passenger Left and Right Foot Pegs 50502550 50502551, Rider Boards 50502552A 50502553, Solo Seat 52000690, Adversary Heated Black Silver Obsolete parts LH 56100582A RH Unknown, Retail of all $2634.60, 2024 Later: Street Glide FLHX, Road FLTRX PARTS.

part #: 50700128 prices

• $700.00-$3499.99

specifications luggagesaddlebags:

• for makes: Harley
• brand: Harley-davidson
• mpn: 50700128
• country of origin: United States

returns luggagesaddlebags:

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

offer luggagesaddlebags:

• availability: In Stock
• best offers: True
• started: March 21, 2026
• quantity: 1
• options: Ship-to-home
• sold: 0

shipping luggagesaddlebags:

• cost: $134.96
• service: UPS Ground
• type: Calculated
• class: Standard
• transit: 5-11 Days
• carrier: UPS

seller luggagesaddlebags:

• city: Clearwater, Florida
• rating: 100.0%
• # reviews: 49

general luggagesaddlebags:

• Motorcycle Scooter Parts Accessories > Luggage, Racks storage > Other Luggage, Racks storage
• condition: New other see details

payments luggagesaddlebags:

• wallet: Paypal
• other
• credit card: Diners-club

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