If you’re a proud owner of a 50cc scooter, you might have already noticed how slow and sluggish it can be. That’s because most scooters are sold with a restricted CDI to comply with local laws and regulations. But if you’re looking for some extra speed and performance, you can easily derestrict your scooter’s CDI. In this guide, we’ll take a look at how to derestrict a 50cc scooter CDI step-by-step.

What Is Derestriction?

How To Derestrict A 50cc Scooter CDI?

Before we dive into the details, let’s take a moment to understand what derestriction means. In simple terms, it is refers to the process of removing or bypassing the limitations and restrictions placed on a vehicle’s engine by the manufacturer. These restrictions are usually put in place to comply with local laws and regulations, but they can also be used to reduce the engine’s power output, thereby making it more fuel-efficient and cost-effective.

Check more: 49cc Carburetor Hoses Diagram

What Does The CDI Do On A Scooter?

The CDI, or the Capacitor Discharge Ignition, is an important component of a scooter’s engine management system. It controls the ignition timing, spark intensity, and fuel delivery to the engine, which ultimately affects the scooter’s performance and speed. A restricted CDI limits the engine’s RPM and top speed, thereby reducing its performance.

How to check if your scooter has a restricted CDI?

Before you begin the process of derestricting your scooter’s CDI, you’ll need to make sure that your scooter has a restricted CDI in the first place. Here’s how you can check:

  • Check your scooter’s documentation: If your scooter is new, check the manufacturer’s documentation to see if it mentions any restrictions on the CDI or the engine.
  • Look for performance issues: If your scooter is sluggish and slow, it’s a sign that the CDI might be restricted. Restricted CDIs are designed to limit the engine’s power output, thereby reducing the scooter’s speed and performance.
  • Consult a mechanic: If you’re still not sure whether your scooter has a restricted CDI or not, consult a mechanic or a scooter specialist. They’ll be able to inspect your scooter and tell you if the CDI is restricted or not.

How To Derestrict The CDI Of A 50cc?

Now, let’s get into the details of how to derestrict a 50cc scooter CDI. Here are the steps you’ll need to follow or watch this video.

Step 1: Gather The Necessary Tools And Supplies

To derestrict your scooter’s CDI, you’ll need a few basic tools and supplies, including:

  • A screwdriver set
  • Wire cutters
  • Electrical tape
  • A voltmeter

Make sure you have all these items ready before you begin.

Step 2: Locate The CDI

It is usually located near the battery or the engine of the scooter. Refer to your scooter’s owner manual or online forums to locate the CDI in your particular model.

Step 3: Remove The CDI Cover

Once you’ve located it, remove the cover using a screwdriver. Be careful not to damage the wires or any other components.

Step 4: Identify The Restriction

Now that you’ve been exposed to it, it’s time to identify the restriction. Look for a small wire that’s usually colored or marked differently from the other wires. This wire is responsible for restricting it and reducing the engine’s power output.

Step 5: Cut The Restriction Wire

Using the wire cutters, cut the restriction wire carefully. Make sure you only cut the wire that’s responsible for the restriction, and not any other wires.

Step 6: Test The CDI

After cutting the restriction wire, use a voltmeter to test it. Connect the voltmeter to the CDI and start the engine. Check the voltage reading on the voltmeter. If the reading is higher than before, it means the CDI is de-restricted successfully.

Step 7: Seal The CDI Cover

Once you’ve confirmed that the CDI is de-restricted, seal the CDI cover using electrical tape or any other adhesive. Make sure the cover is securely in place to prevent any damage to the CDI.

Why Are Some Scooters Having A Restricted CDI?

Manufacturers put restrictions on scooters for various reasons, including:

  • Complying with local laws and regulations: Some countries have strict regulations on scooter speed and performance. To comply with these regulations, manufacturers put restrictions on the CDI and other engine components.
  • Reducing emissions: Restricted CDIs and engines are more fuel-efficient and produce fewer emissions than unrestricted ones. This makes them more environmentally friendly and cost-effective.
  • Reducing maintenance costs: Scooters with unrestricted engines and CDIs require more maintenance and servicing than those with restricted ones. By putting restrictions on the CDI and the engine, manufacturers can reduce the maintenance costs for the owner.

How To Remove Derestriction From Your Record?

If you’re planning to sell your scooter or trade it in, you might want to remove the t from your record. Here’s how you can do it:

  • Visit your local DMV: Contact your local DMV to find out what the requirements are for removing the derestriction from your record. Some DMVs might require proof that it has been removed, while others might not.
  • Provide proof of derestriction removal: If your DMV requires proof of its removal, provide them with a certificate or a letter from a mechanic or a scooter specialist stating that it has been removed.
  • Pay any fees: Some DMVs might charge a fee for removing it from your record. Make sure you pay any fees that are required.

How Much Does It Cost To Remove Derestriction?

The cost of removing derestriction from your scooter’s CDI will depend on various factors, including:

  • The make and model of your scooter
  • The location of the mechanic or specialist
  • The extent of the derestriction

On average, you can expect to pay anywhere from $50 to $200 for its removal. However, the cost could be higher or lower depending on your particular situation. Be sure to get a quote from a mechanic or a specialist before proceeding with the derestriction removal process.


Here is some fqa it might help you more to know how to derestrict a 50cc scooter CDI.

What does a unrestricted CDI do?

An unrestricted CDI allows the engine to perform at its full potential without any limitations or restrictions on its power output.

How fast will a derestricted 50cc scooter go?

The speed of a derestricted 50cc scooter will vary depending on the make and model of the scooter, as well as other factors such as the rider’s weight and the road conditions. However, it can typically reach speeds of up to 45-50 mph.

How can I get more speed out of my 50cc moped?

There are several ways to get more speed out of your 50cc moped, including derestricting the CDI, upgrading the exhaust system, and tuning the carburetor.

Are all 50cc scooters restricted?

Not all 50cc scooters are restricted, but many manufacturers do put restrictions on the CDI and other engine components to comply with local laws and regulations.

What restrictions are on 50cc engines?

The restrictions on 50cc engines vary depending on the country or region, but they typically limit the engine’s power output and top speed.

Is Derestricting CDI Safe For The Motor ??

Derestricting the CDI can be safe for the motor if done correctly by a professional mechanic or a scooter specialist.

How Do I Know If CDI Is Working?

You can test if the CDI is working by using a multimeter to check the voltage at the CDI’s output wire while the engine is running.

Does Derestricting A Moped Damage It?

Derestricting a moped can potentially damage it if done incorrectly or if the engine is not in good condition. It’s important to consult a professional before attempting to derestrict your moped.