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  2. sku: 23515681400316983
  3. KYMCO 3920A-LKK7-E00

KYMCO 3920A-LKK7-E00 Ecu Module

fits model: 450i, Mxu450i, Mxu. make: Kymco. year: 2011–2021.

3920a-lkk7-e00 Kymco Ecu Module Mxu 450i Mxu450i Oem 2011-2021

( Manufacturer Part Number: 3920A-LKK7-E00 ), ( Part Type: Ecu Module )

Review KYMCO Ecu Module Oem fits 450I MXU450I MXU 2011–2021

The **Kymco 3920A-LKK7-E00 ECU Module (MXU 450i, MXU450i, 2011 2021)** is a high-performance, factory-replacement electronic control unit designed specifically for Kymco s MXU 450i and MXU450i off-road dirt bikes, spanning model years from 2011 through 2021. Engineered to meet or exceed OEM specifications, this ECU module serves as the brain of the bike s fuel injection system, precisely controlling throttle response, ignition timing, air-fuel ratios, and overall engine performance with unmatched accuracy. Built with a robust, high-quality construction, the module features a durable, corrosion-resistant housing and a sealed connector to ensure long-term reliability, even under the harshest riding conditions whether tackling rugged trails, competing in motocross events, or enduring frequent use in training sessions. This ECU is fully compatible with Kymco s MXU 450i s 449cc parallel-twin engine, delivering optimized power delivery, smoother acceleration, and improved throttle consistency, which translates to better handling and responsiveness on the track or in the dirt.

One of the standout features of this ECU module is its compatibility with aftermarket tuning solutions, allowing riders to customize their bike s performance through software adjustments. Whether you re looking to enhance low-end torque for better hill climbs, fine-tune high-end power for faster top speeds, or optimize fuel efficiency for longer rides, this module provides the flexibility to tailor the engine s behavior to your specific needs. The ECU also integrates seamlessly with Kymco s diagnostic tools, enabling easy troubleshooting, error code reading, and firmware updates to keep the system running at peak efficiency. With its precise calibration and adaptability, this module is ideal for both stock riders seeking reliability and performance enthusiasts looking to push their bikes to their limits.

For those who prioritize durability and ease of installation, the **3920A-LKK7-E00 ECU** is designed for straightforward replacement, requiring minimal technical expertise. It is a direct drop-in replacement for the original factory unit, ensuring compatibility without the need for additional modifications or wiring changes. Whether you re replacing a worn-out OEM ECU or upgrading from a generic aftermarket unit, this module guarantees a seamless fit and immediate performance improvements. Built to withstand the demands of off-road riding, it resists dust, moisture, and temperature fluctuations, making it a dependable choice for riders who demand both performance and longevity. Whether you re a seasoned motocross competitor or a weekend warrior, this ECU module is a critical component for maintaining optimal engine function and ensuring your Kymco MXU 450i delivers consistent, high-performance results year after year.

### **Pros and Cons of Buying a Kymco 3920A-LKK7-E00 ECU Module (MXU 450i, 2011 2021)**

#### **Pros:**

1. **Compatibility and Reliability** The ECU module is designed specifically for the Kymco MXU 450i (2011 2021 models), ensuring proper engine management, fuel injection, and ignition timing. A genuine or high-quality aftermarket replacement will restore factory performance and prevent drivability issues.

2. **Cost-Effective Repair** Replacing a faulty ECU is often cheaper than overhauling or replacing the entire engine control system. A new or refurbished module can save hundreds of dollars compared to labor-intensive diagnostics or engine swaps.

3. **Improved Performance and Fuel Efficiency** A properly functioning ECU ensures optimal fuel delivery, ignition timing, and throttle response. If the original ECU was failing, a replacement can restore or even enhance performance and fuel economy.

4. **Prevents Further Damage** A failing ECU can lead to misfires, poor acceleration, or even catastrophic engine failure if left unaddressed. Replacing it early prevents secondary damage to sensors, injectors, or catalytic converters.

5. **Aftermarket Customization Potential** Some ECU modules (especially remapped or tunable versions) allow for performance upgrades, such as increased horsepower, torque, or throttle response. This is useful for riders looking to modify their bike legally or for track use.

6. **Ease of Installation** ECU replacements are relatively straightforward for mechanics with basic tools. Many models require only a few screws to be removed, and some can be swapped in under an hour with minimal wiring adjustments.

7. **Warranty Coverage (If Purchased New/Refurbished)** Reputable sellers offer warranties on ECU modules, providing peace of mind against manufacturing defects or early failure.

8. **Availability of Parts** Since the MXU 450i is a popular model, spare ECUs are widely available from manufacturers like **Kymco, MX Tech, or third-party suppliers** (e.g., eBay, Amazon, or specialty motorcycle parts stores).

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#### **Cons:**

1. **Potential Counterfeit or Low-Quality Modules** Buying from untrusted sellers may result in a **fake or poorly manufactured ECU**, leading to intermittent failures, poor performance, or even complete non-functionality. Always verify the seller s reputation and product authenticity.

2. **Compatibility Risks with Modified Bikes** If the bike has been heavily modified (e.g., turbocharged, supercharged, or custom fueling), a stock ECU may not handle the increased stress, leading to premature failure or incorrect tuning.

3. **Learning Curve for DIY Installation** While ECU swaps are simple, wiring harness mismatches or improper grounding can cause issues. Beginners may need professional assistance, adding to labor costs.

4. **Software Limitations** Some aftermarket ECUs lack the latest firmware updates or may not support advanced diagnostics tools, making troubleshooting harder if problems arise.

5. **Cost of Professional Installation (If Needed)** If the buyer lacks mechanical experience, a shop may charge **$50 $150 for labor**, increasing the total cost.

6. **Risk of Voiding Warranty (If Applicable)** On newer bikes with manufacturer warranties, replacing the ECU with an aftermarket part may void coverage for related components.

7. **Potential for Sensor Mismatches** If the bike s sensors (e.g., MAF, O2, throttle position) are degraded, a new ECU may not perform optimally until those are replaced or recalibrated.

8. **Limited Longevity in Harsh Conditions** Extreme temperatures, moisture, or electrical interference (from poor wiring) can shorten the lifespan of even a high-quality ECU.

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### **Conclusion:**

Buying a **Kymco 3920A-LKK7-E00 ECU module** for a **MXU 450i (2011 2021)** is generally a **wise and cost-effective solution** for restoring engine performance, especially if the original ECU is failing. The benefits **reliability, performance improvement, and cost savings** outweigh the risks when purchasing from a **trusted supplier** and ensuring proper installation.

However, **potential downsides** such as **counterfeit parts, installation errors, or compatibility issues with heavily modified bikes** must be mitigated by:

- **Buying from reputable sellers** (e.g., official Kymco dealers, verified eBay/Amazon sellers, or trusted motorcycle parts stores).

- **Verifying compatibility** (confirm the exact model year and any modifications).

- **Considering professional installation** if unsure about wiring or diagnostics.

- **Monitoring performance post-installation** to catch any issues early.

For most riders, **a genuine or high-quality aftermarket ECU is a sound investment** that extends the life of their bike and improves ride quality.

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### **Final Recommendation:**

- **Best Option:** Purchase a **new or refurbished ECU from a trusted supplier** (e.g., **MX Tech, Kymco authorized dealers, or well-reviewed online retailers**).

- **Budget Option:** If cost is a concern, a **refurbished OEM ECU** (from a reliable source) can be a good middle ground.

- **DIY vs. Professional Installation:**

- If comfortable with basic motorcycle maintenance, **DIY installation is feasible**.

- If unsure, **have a mechanic verify the swap** to avoid wiring mistakes.

- **Avoid:** Cheap, unbranded ECUs from unknown sellers, as they often fail prematurely.

- **Post-Installation:** **Reset the ECU** (if required) and **monitor for error codes** using an OBD-II scanner to ensure proper function.

A well-sourced ECU replacement will **save money, improve performance, and prevent further engine issues**, making it a **strong recommendation** for MXU 450i owners facing ECU-related problems.

Details:

This is a brand new OEM ECU in box. It fits all years of MXU450i.

part #: 3920alkk7e00 prices

  • $389.95-$399.00

specifications electricacompone:

  • for models: 450i, Mxu450i, Mxu
  • for makes: Kymco
  • for years: 2011-2021
  • mpn: 3920a-lkk7-e00
  • part type: Ecu Module

shipping electricacompone:

  • cost: $15.60
  • carrier: USPS
  • service: USPS Priority Mail
  • class: Expedited
  • transit: 5-9 Days
  • type: Calculated

payments electricacompone:

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

offer electricacompone:

  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock
  • started: February 12, 2026

general electricacompone:

  • ATV, Side-by-Side UTV Parts Accessories > Electrical Ignition Components > Other Electrical Ignition Components
  • condition: New

returns electricacompone:

  • policy: No Returns

seller electricacompone:

  • # reviews: 6714
  • city: Darlington, Wisconsin
  • rating: 99.7%
for models: 450i, mxu450i, mxu, for makes: kymco, for years: 2011-2021, part type: ecu module,
category: atv parts > atv, side-by-side utv parts accessories > electrical ignition components, sku: 23515681400316983,
Kymco 3920A-LKK7-E00 Is Similar To:
electricacompone logo
2 offers $389.95–$399.00 USD
  • New. Offer #1 priced at $389.95 + $16.85 shipping estimate = $406.80* total. It fits all years of MXU450i. This is a brand new OEM ECU new in box.+$16.85 shipping
  • New. Offer #2 priced at $399.00 + $10.00 shipping estimate = $409.00* total. OEM KYMCO PART FITS.+$10.00 shipping

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