The Kymco AK 550, a maxi-scooter that promised a blend of performance, comfort, and style, has garnered attention since its release. While many owners praise its handling and features, a significant number have also encountered a variety of issues. Understanding these problems is crucial for potential buyers and current owners alike, helping them make informed decisions and address concerns proactively.

So, What's the Buzz (and the Bummers)? Common AK 550 Issues

Let's dive into some of the most frequently reported problems with the Kymco AK 550. These range from minor annoyances to more serious mechanical concerns, and understanding them can save you headaches down the road.

1. The Infamous Stalling Issue:

Perhaps the most widely reported problem is the AK 550's tendency to stall, especially at low speeds or when coming to a stop. This can be incredibly frustrating and even dangerous in traffic.

  • What's happening? The engine simply cuts out, often without warning.
  • Why does it happen? Several factors can contribute, including:
    • ECU Mapping: Early models were particularly prone to this, suggesting an issue with the engine control unit's (ECU) programming. The fuel-air mixture might be incorrect under certain conditions, leading to the stall.
    • Idle Speed: An improperly set idle speed can also cause stalling. If the idle is too low, the engine may not have enough power to maintain combustion when the throttle is closed.
    • Throttle Position Sensor (TPS): A faulty TPS can send incorrect signals to the ECU, leading to improper fuel delivery and stalling.
    • Fuel Pump Issues: Less common, but a failing fuel pump can starve the engine of fuel, especially under load or at low speeds.
  • How to fix it?
    • ECU Remapping: The most effective solution often involves having the ECU remapped by a Kymco dealer. This updates the engine's programming and can address the fuel-air mixture issues.
    • Idle Speed Adjustment: Adjusting the idle speed to the manufacturer's specifications can help prevent stalling. This is a relatively simple procedure that can be done by a mechanic.
    • TPS Replacement: If the TPS is faulty, it will need to be replaced.
    • Fuel Pump Inspection/Replacement: A mechanic can test the fuel pump's output and pressure to determine if it's functioning correctly. If it's failing, it will need to be replaced.

2. Vibration Blues:

Another common complaint is excessive vibration, particularly at certain speeds. This can make long rides uncomfortable and even cause fatigue.

  • What's happening? The scooter vibrates noticeably, especially through the handlebars and footrests.
  • Why does it happen?
    • Engine Mounting: The engine mounts may not be properly aligned or tightened, allowing excessive vibration to transfer to the frame.
    • Wheel Balance: Unbalanced wheels can cause significant vibration, especially at higher speeds.
    • Tire Issues: Damaged or worn tires can also contribute to vibration.
    • Transmission Issues: In rare cases, issues within the transmission can cause vibrations.
  • How to fix it?
    • Engine Mount Inspection/Adjustment: A mechanic can inspect the engine mounts for proper alignment and tightness.
    • Wheel Balancing: Having the wheels balanced professionally is essential to eliminate vibration caused by unbalanced wheels.
    • Tire Replacement: Replacing worn or damaged tires can significantly reduce vibration.
    • Transmission Inspection: If other solutions don't work, a mechanic should inspect the transmission for potential issues.

3. The Dreaded "Check Engine" Light:

The "Check Engine" light illuminating on the dashboard can be alarming. It indicates that the ECU has detected a fault in one of the scooter's systems.

  • What's happening? The "Check Engine" light is on.
  • Why does it happen? The light can be triggered by a wide range of issues, from minor sensor malfunctions to more serious engine problems. Common causes include:
    • Sensor Malfunctions: Oxygen sensors, temperature sensors, and other sensors can fail, triggering the light.
    • Exhaust System Issues: Problems with the exhaust system, such as a catalytic converter failure, can also trigger the light.
    • Fuel System Problems: Issues with the fuel injectors or fuel pump can also cause the light to come on.
    • Loose Gas Cap: Believe it or not, a loose gas cap can sometimes trigger the light due to pressure changes in the fuel tank.
  • How to fix it?
    • Diagnostic Scan: The first step is to have the scooter scanned by a mechanic using a diagnostic tool. This will read the error code stored in the ECU and pinpoint the source of the problem.
    • Repair Based on Error Code: Once the error code is identified, the mechanic can diagnose and repair the underlying issue. This may involve replacing a faulty sensor, repairing the exhaust system, or addressing fuel system problems.

4. Battery Blues:

Some AK 550 owners have reported issues with the battery, including premature failure and difficulty starting the scooter.

  • What's happening? The battery dies quickly or the scooter struggles to start.
  • Why does it happen?
    • Poor Battery Quality: The original battery may not be of the highest quality.
    • Parasitic Drain: Electrical components drawing power even when the scooter is turned off can drain the battery.
    • Charging System Issues: Problems with the charging system can prevent the battery from fully charging.
    • Infrequent Use: Scooters that are not used regularly are more prone to battery issues.
  • How to fix it?
    • Battery Replacement: Replacing the battery with a high-quality aftermarket battery is often the best solution.
    • Parasitic Drain Test: A mechanic can perform a parasitic drain test to identify any components drawing excessive power when the scooter is off.
    • Charging System Inspection: The charging system should be inspected to ensure that it's functioning correctly.
    • Battery Tender: Using a battery tender when the scooter is not in use can help maintain the battery's charge.

5. Suspension Woes:

While the AK 550's suspension is generally considered adequate, some owners have found it to be too stiff, especially on rough roads.

  • What's happening? The ride feels harsh and uncomfortable, particularly on bumpy surfaces.
  • Why does it happen?
    • Stiff Factory Settings: The factory suspension settings may be too firm for some riders.
    • Suspension Component Quality: The quality of the suspension components may not be as high as some riders expect.
  • How to fix it?
    • Suspension Adjustment: Adjusting the suspension settings, such as preload and damping, can improve the ride quality.
    • Aftermarket Suspension: Upgrading to aftermarket suspension components can provide a more comfortable and controlled ride.

6. Panel Fitment Issues:

A minor but noticeable issue for some owners is the quality of the panel fitment. Gaps or misalignments can detract from the scooter's overall appearance.

  • What's happening? Panels don't line up perfectly or have noticeable gaps.
  • Why does it happen?
    • Manufacturing Tolerances: Manufacturing tolerances may vary, leading to inconsistencies in panel fitment.
  • How to fix it?
    • Panel Adjustment: In some cases, the panels can be adjusted to improve the fitment.
    • Warranty Claim: If the fitment issues are significant, a warranty claim may be possible.

Are These Problems Deal-Breakers?

Not necessarily. Many AK 550 owners are perfectly happy with their scooters and have not experienced any of these issues. However, it's important to be aware of the potential problems and to factor them into your decision-making process.

Here's a balanced perspective:

  • Do your research: Read reviews from multiple sources and talk to other AK 550 owners.
  • Test ride: If possible, take the scooter for a test ride before buying it. Pay attention to any vibrations, stalling, or other issues.
  • Check the service history: If buying a used AK 550, check the service history to see if any of these problems have been addressed.
  • Consider a newer model: Newer models may have addressed some of the issues reported in earlier versions.

Frequently Asked Questions about AK 550 Problems

  • Is the stalling issue completely fixed in newer AK 550 models? While improvements have been made, some owners of newer models still report occasional stalling, although it is generally less frequent.
  • Are the vibrations dangerous? The vibrations themselves are unlikely to be dangerous, but they can cause discomfort and fatigue on long rides.
  • Is the "Check Engine" light always a sign of a serious problem? No, the "Check Engine" light can be triggered by minor issues as well as more serious problems. A diagnostic scan is needed to determine the cause.
  • How much does it cost to remap the ECU? The cost of ECU remapping can vary depending on the dealer, but it typically ranges from $200 to $400.
  • Is the AK 550 a reliable scooter overall? Despite the potential problems, the AK 550 is generally considered a reliable scooter, especially after common issues are addressed.

The Bottom Line

The Kymco AK 550 offers a compelling package of performance and features, but it's not without its potential drawbacks. Being aware of the common problems, such as stalling and vibration, allows you to make an informed purchase or address issues proactively if you already own one. Research, test ride, and understand the service history to ensure a smoother ownership experience.