How to Derestrict a 50cc Scooter – Simple Steps

Are you tired of feeling limited by the speed and performance of your 50cc scooter? If so, you’re in luck! In this article, we will guide you through the process of derestricting your scooter to unlock its full potential.

Derestricting a 50cc scooter involves removing or modifying certain components that restrict its speed and power. By doing so, you can experience a significant increase in acceleration and top speed. However, it’s important to note that derestricting your scooter may not be legal in all areas. Before proceeding with any modifications, make sure to understand the restriction laws in your area.

Once you have gathered the necessary tools and equipment, we will show you how to:

  • Locate and remove restrictive washers or plates
  • Adjust the carburetor for optimal performance
  • Modify the transmission belt
  • Increase the fuel mixture
  • Test and adjust the performance

We will also provide tips on maintaining and servicing your scooter regularly.

So let’s get started on unleashing the true power of your 50cc scooter!

Key Takeaways

  • Derestricting a 50cc scooter involves removing or modifying certain components that restrict speed and power.
  • It is important to understand and comply with local laws and regulations when derestricting a scooter.
  • Researching and gathering information about specific laws in your locality is necessary before derestricting a scooter.
  • Regular maintenance and servicing of a scooter are crucial for a safe and enjoyable riding experience.

Gather the Necessary Tools and Equipment

To start the process, acquire all the essential tools and equipment needed. Here’s a list of four items you’ll require:

  1. Screwdriver: You’ll need a good quality screwdriver set with different sizes of Phillips and flathead screwdrivers. It’s essential for removing screws and panels on your scooter.
  2. Socket Set: Invest in a socket set that includes various sizes of sockets. It’ll come in handy when loosening or tightening bolts on your scooter.
  3. Wire Cutters: You’ll need wire cutters to disconnect any wires that may be restricting the speed or performance of your scooter. Make sure they’re sharp and can easily cut through different gauges of wire.
  4. Performance Exhaust System: Upgrading your exhaust system can significantly improve the power and speed of your scooter. Look for an exhaust system specifically designed for your make and model.

Having these tools at hand will make derestricting your 50cc scooter much easier. Before proceeding, make sure you have a safe workspace where you can comfortably work on your scooter without any distractions or hazards.

Remember to always follow safety precautions when working with tools and equipment. Wear protective gear such as gloves and goggles to protect yourself from any potential injuries.

Now that you’ve gathered all the necessary tools, you’re ready to move on to the next step in derestricting your 50cc scooter—removing the restrictions from its engine components.

Remove The Muffler


Before you attempt to remove the muffler on your 50cc scooter, you must make sure that it is the right size. If it is not, you can either have the mechanic remove it or purchase a replacement muffler. If you’re unsure of which size to buy, read the owner’s manual and ask your mechanic to show you the proper installation procedures.

A 50cc scooter has a complex exhaust system with two restrictors: a resonator tube and inner flange. These are there to restrict flow and to keep the scooter from scavenging. To remove these restrictors, you will need the right tools.

Once you’ve removed the restrictive part, you can install a performance exhaust. A performance exhaust allows you to get more power than a stock exhaust does. You can find these tools at your local hardware store or online. You’ll also need to remove the air restrictor. TGB scooters also have a CDI, so it’s important to change it. Some TGB scooters can have their CDI modified so that they don’t have a rev limiter.

If you want to increase the speed of your 50cc scooter, you can remove the muffler and replace it with a more powerful one. This step can be difficult for some riders, so it’s best to leave this job to an experienced technician. You can also increase the air intake by removing the restrictive washer from underneath the front pulley wheel.

Aftermarket air filters will also help you increase speed. They work by blocking dirt particles and allowing air into the engine. By using a cone-shaped foam air filter, you’ll be able to achieve speeds of 70km/hr or more. Aside from allowing for faster speed, these filters do not require any additional components.

As standard, 50cc mopeds have restricted engines. This means they have a lower top speed than what they’re engine is actually capable of reaching, but this is a legal requirement. A restricted moped has a maximum speed of 30mph.

Remove The Carburetor Jets

Carburetor Jets

Changing the carburetor jets is relatively easy. You will need to remove the airbox, throttle cable, and inlet manifold. You will also need to disconnect the fuel lines and vacuum lines. You may need to remove the body panels to do this.

Most scooters and mopeds are equipped with a single carburetor. The carburetor is usually located near the bottom of the float bowl and has a drain screw near the bottom of the float bowl. Before beginning, drain the fuel into a gas-safe container. Next, unscrew the throttle slide and needle jet. You must also remove the throttle slide and spring. Afterward, unscrew the manifold and remove the clamps.

Once you’ve removed the carburetor, you should carefully remove the float and main jet. The main jet is situated right in the center of the carburetor, and the pilot jet is located next to the jet. You’ll want to replace this main jet with a new one, which will increase the scooter’s performance and mileage.
Once you’ve removed the screws from the top of the carburetor, unscrew the screws holding the diaphragm and slide assembly. You’ll want to carefully pull the assembly out of the carburetor as there may be loose parts. The needle retainer is usually a flat steel plate or a plastic piece.

Install Aftermarket Intake Manifolds

Aftermarket Intake Manifolds

Derestricting your 50cc scooter involves replacing parts that limit the speed of your vehicle. Manufacturers of these scooters install certain parts that limit their maximum speed to thirty kph. These parts are called carburetor opening restrictions and must be removed in order to make your scooter go faster.

There are many benefits to derestricting your scooter. First, you’ll improve the performance of the engine, allowing the scooter to last longer. Secondly, restricting parts can wear down the variomatic ring, which leads to increased engine temperature.

Lastly, you’ll need an operating license to derestrict your 50cc scooter. You must also check your scooter’s fuel system before making any modifications. This will prevent flooding or running lean. Depending on your model, you may not be able to remove the jets without damaging the fuel system.

There are several different ways to derestrict a 50cc bike. One way is to swap the jets on your carburetor. If your scooter has two identical jets, remove the smaller one and replace it with a larger one.

Once the washer is removed, the scooter’s engine will be more efficient, but it’ll also be louder at high speeds. There are many reasons why 50cc scooter engines are restricted. Firstly, they’re built for people with limited training and experience. Secondly, they’re built for predictable performance. They’re not meant to be modified in such a way as to make them unsafe.

The third way to derestrict a 50cc scoot is by removing the restriction on its exhaust. This can be done with a handsaw or micro grinder. Make sure you cut the dummy pipe off as close to the manifold as possible. Then, weld back together the exhaust. This process may take up to five minutes.

Remove The Rev Limiter

The Rev Limiter

If you want to improve the performance of your scooter, you can remove the rev limiter. This device is a part of the electronic ignition module. If you want to change the performance of your scooter, you can change the ECU to a high performance unit and disable the rev limiter.
Removing the REV limiter is very easy. You must know how to use the right tools and the correct procedure. You should also be an experienced mechanic. Specialist tuning shops sell electronic kits which allow you to modify the REV limiter. But, keep in mind that removing the limiter may disqualify you from driving your scooter.

You can also try removing the speed sensor. This is the easiest type of speed controller. You can easily remove it by disengaging the wires from the sensor. You may need a Phillips head screwdriver to remove the sensor. The good news is that you can easily reattach it again.
Before you remove the speed limiter, make sure you check your state’s laws and regulations. In some states, this will change the classification of the scooter. It will also require you to use more batteries or purchase additional battery packs. To remove the speed limiter, you will need to remove three screws, each measuring 5/64 inches.

The digital speed limiter is designed to work in 2-stroke mopeds. It records the current speed and rpm. It is read through a sensor fitted to the wheel and the CDI pickup cable. Compared to analogue rev limiters, digital rev limiters are easier to adjust.

Open Up The Variator System

Variator System

Before you can start opening the variator system on a 50cc scooter, you have to remove the intake case. The intake case is where the kickstart is held in place by a plastic mold. There are only two or three bolts connecting this piece to the rest of the scooter. Take those out and then you can take offthe variator case lid – which looks like a flattened hot dog made out of plastic.. All you need for this task are some hand tools and general knowledge about taking things apart.

To open the variator system, you should take the scooter to a dry and clean area. Before removing the variator cover, be sure to take a photo of the entire system to aid in your disassembly. Also, you should have a rubber mallet and some tools for gripping and locking. You may also want to take a rag and brake cleaner to clean the area.

The second step is to replace the drive belt. This belt should not be cracked, brittle, or frayed and should have a minimum width. If the belt is slack or oily, it may be time for maintenance. The pulley may be worn out or not installed correctly, which may cause premature wear to the drive belt.

Before opening up the variator system on a 50CC scooter, be sure to check the drive belt. This is an important component of the variator system. If it’s not adjusted properly, the engine may run sluggishly and have a lower RPM than expected.

Changing the clutch may also cause damage to the clutch. While it is relatively easy to remove the clutch, it is essential to check the belt first before attempting the tuning process. A properly adjusted variator should be able to keep the scooter under top speed, which is essential for safety. While some of the variators have a throttle ring, removing the throttle ring will render the scooter illegal in many European countries. If the scooter does not meet these requirements, you may get in trouble with the police.

Install a Performance Exhaust System

To enhance your riding experience, you can optimize performance by installing a high-performance exhaust system on your 50cc scooter. A performance exhaust system is designed to increase the flow of exhaust gases, allowing your engine to breathe more freely and produce more power. This simple modification can make a significant difference in the overall performance of your scooter.

When choosing a performance exhaust system for your 50cc scooter, it’s essential to consider factors such as material, design, and compatibility. Here is a table highlighting three popular options:

Exhaust SystemMaterialCompatibility
Option 1Stainless SteelUniversal Fit
Option 2Carbon FiberSpecific Models
Option 3AluminumCustomizable

Each option has its advantages and disadvantages depending on your preferences and budget. Stainless steel offers durability and resistance to corrosion, making it suitable for all weather conditions. Carbon fiber is lightweight and provides a sporty look while offering excellent heat resistance. Aluminum is known for its affordability and versatility, as it can be customized according to your specific needs.

Once you have chosen the right exhaust system for your scooter, installation should be relatively straightforward. However, it’s crucial to follow the manufacturer’s instructions carefully or seek professional assistance if needed.

By installing a high-performance exhaust system on your 50cc scooter, you can unlock its true potential and enjoy improved acceleration and top speed. So go ahead and take the plunge – upgrade your scooter with an aftermarket exhaust system that suits both your style and desired level of performance!

Upgrade Air Filter

Enhancing your riding experience can be achieved by upgrading the air filter, allowing for improved airflow and better performance. By replacing the stock air filter with a high-performance one, you can maximize the potential of your 50cc scooter. Here are three reasons why upgrading the air filter is essential:

      1. Increased Airflow: A high-performance air filter allows more clean air to enter the engine, resulting in enhanced combustion efficiency. This increased airflow helps your scooter breathe better and deliver more power to the wheels.

      1. Improved Fuel Efficiency: With a better airflow, your scooter’s engine doesn’t have to work as hard to produce power. This means it can achieve higher fuel efficiency, saving you money on gas in the long run.

      1. Enhanced Acceleration: Upgrading the air filter improves throttle response and acceleration. It reduces lag time between twisting the throttle and feeling that immediate burst of speed, making your rides more exciting and enjoyable.

    To upgrade your air filter, start by locating it under the scooter’s seat or inside a compartment near the engine. Remove any screws or clips holding it in place and carefully take out the old filter. Replace it with a high-quality aftermarket air filter designed specifically for your scooter model.

    Remember to regularly clean and oil your new air filter according to manufacturer instructions to maintain its optimal performance. With this simple upgrade, you’ll unlock hidden potential in your 50cc scooter and enjoy a smoother, more powerful ride every time you hit the road.

    Replace the Roller Weights in the Variator

    Ready to take your riding experience to the next level? Replace the roller weights in your scooter’s variator and feel the difference in performance. The roller weights play a crucial role in determining how quickly your scooter accelerates and reaches its top speed. By replacing them with lighter or heavier ones, you can customize the power delivery of your scooter to better suit your needs.

    To help you understand how different roller weights affect performance, here is a table showcasing some example combinations:

    Roller Weight (g)AccelerationTop Speed

    Lighter roller weights like 6.5 grams will provide quicker acceleration but may sacrifice some top speed. On the other hand, heavier weights like 7.5 grams offer smoother acceleration and can increase your scooter’s top speed potential.

    Replacing the roller weights is relatively straightforward, but it requires access to the variator system on your scooter. Start by removing the CVT cover to expose the variator assembly. Then, carefully remove the old roller weights and replace them with your chosen ones. Make sure they are properly seated before reassembling everything.

    Once you’ve installed new roller weights, take your scooter for a test ride and pay attention to how it performs during acceleration and at top speeds. Adjusting the roller weight combination allows you to fine-tune your scooter’s performance according to your preferences.

    So why wait? Upgrade your scooter’s variator by replacing its roller weights today, and experience an enhanced riding experience that matches exactly what you desire!

    Modify the Transmission Belt

    Rev up your ride by giving your scooter’s transmission belt a modification that’ll transport you to a whole new level of performance.

    Modifying the transmission belt is another effective way to derestrict your 50cc scooter and increase its top speed. The transmission belt plays a crucial role in transferring power from the engine to the wheels, so making some adjustments can greatly improve its efficiency.

    To modify the transmission belt, start by removing the variator cover and taking out the old belt. Inspect it carefully for any signs of wear or damage. It’s important to choose a high-quality replacement belt that’s specifically designed for your scooter model.

    Next, you need to measure and cut the new belt according to your scooter’s specifications. Use an appropriate tool like a utility knife or scissors, making sure to make clean cuts without fraying the edges. Install the new belt onto the variator pulley and make sure it sits properly within the grooves.

    Once you’ve installed the modified transmission belt, reassemble all the components back into place securely. Double-check that everything’s tightly fastened before giving it a test run. You should notice an immediate improvement in acceleration and top speed.

    Remember, modifying your scooter’s transmission belt may affect its overall durability, so regular maintenance and inspections are essential to ensure optimal performance. Additionally, always follow local traffic laws and regulations when riding your derestricted scooter on public roads.

    By modifying your transmission belt, you’re unleashing more power from your 50cc scooter and enjoying an exhilarating riding experience like never before. Get ready for an adrenaline-filled adventure as you zip through traffic with increased speed!

    Increase the Fuel Mixture

    Now that you’ve learned how to modify the transmission belt, let’s move on to another method to derestrict your 50cc scooter – increasing the fuel mixture. This simple adjustment can provide a significant boost in performance and speed.

    To begin, locate the carburetor on your scooter. It’s usually located near the engine and has a series of screws or knobs. You’ll need to access these screws to adjust the fuel mixture.

    Here are three steps to increase the fuel mixture and enhance your scooter’s power:

        1. Identify the air-fuel screw: Start by locating the air-fuel screw on your carburetor. This screw controls the ratio of air and fuel entering into the combustion chamber. Turning it clockwise will richen the mixture, while turning it counterclockwise will lean it out.

        1. Adjust the screw: With a small flathead screwdriver, carefully turn the air-fuel screw in a clockwise direction until it stops gently. Be careful not to overtighten it as this may damage your carburetor.

        1. Fine-tuning: After setting it fully clockwise, start turning it counterclockwise slowly until you achieve smoother acceleration and better throttle response. Pay attention to any changes in performance and adjust accordingly.

      By increasing the fuel mixture, you provide more fuel for combustion, resulting in increased power output from your engine.

      Remember, modifying any component of your scooter comes with risks and may void warranties or violate regulations. Make sure you understand local laws before making any modifications.

      With this simple adjustment complete, get ready for an even more thrilling ride on your derestricted 50cc scooter!

      Test and Adjust the Performance

      To make the most of your modified fuel mixture, it’s time to put your scooter to the test and fine-tune its performance. Testing and adjusting the performance of your derestricted 50cc scooter will ensure that you have achieved the desired outcome and optimized its capabilities.

      Firstly, take your scooter for a test ride on a straight road with little traffic. Start by observing how it accelerates from a standstill. Is there an improvement in acceleration compared to before? Note down any changes you notice in terms of speed and responsiveness.

      Next, check how well your scooter handles corners. Does it maintain stability while taking turns at higher speeds? Pay attention to any wobbling or skidding that might occur during sharp turns.

      After evaluating acceleration and cornering, move on to testing top speed. Find a safe location where you can open up the throttle fully and see if your scooter reaches higher speeds than before. Keep track of any differences in maximum speed achieved.

      Now that you have gathered data from testing, it’s time to adjust the performance accordingly. Use the table below as a guide:

      Performance AspectAdjustment NeededSteps to Adjust
      AccelerationIncreaseAdjust carburetor or variator
      CorneringImprove stabilityCheck suspension or tire pressure
      Top SpeedEnhanceModify exhaust or air filter

      By following these steps, you can fine-tune your derestricted 50cc scooter’s performance according to your preferences. Remember to make small adjustments at a time and retest after each modification until you achieve optimal results. Enjoy the newfound power and freedom on two wheels!

      Maintain and Service Your Scooter Regularly

      Regular maintenance and servicing are essential to keep your scooter running smoothly and ensure its longevity. By following these simple steps, you can maintain and service your scooter regularly:

          • Check the oil: Regularly inspect the oil level and quality to ensure proper lubrication of the engine. If needed, top up or change the oil as per the manufacturer’s recommendations.

          • Inspect the brakes: Check both front and rear brakes for wear and tear. Replace brake pads if necessary. Ensure that the brake cables are properly adjusted for optimal performance.

          • Clean or replace air filters: Air filters prevent dust and debris from entering the engine, so they need regular cleaning or replacement. Clean reusable filters with compressed air, while disposable ones should be replaced according to the manufacturer’s instructions.

        Additionally, there are other vital maintenance tasks you should consider:

            • Tire pressure check: Monitor tire pressure regularly as underinflated or overinflated tires can affect handling and fuel efficiency.

            • Chain lubrication: Keep your scooter’s chain well-lubricated to minimize friction. A dry chain can lead to poor performance and premature wear.

            • Spark plug inspection: Regularly inspect spark plugs for signs of fouling or damage. Replace them if necessary to ensure efficient combustion.

          By adhering to a regular maintenance schedule, you can keep your scooter in peak condition. Remember to consult your owner’s manual for specific guidelines on service intervals and procedures. Taking care of your scooter will not only extend its lifespan but also contribute to a safer and more enjoyable riding experience overall.

          Why are scooter engines restricted?

          Scooters are facing restrictions for varied reasons, which can be broadly classified into the following three categories:
          ⦁ Environmental restrictions:
          ⦁ To allow for use with a certain drivers license class
          ⦁ To comply with speed limits and legal requirements

          Environmental restrictions

          The term “catalyst” might seem to be a little daunting, but it’s really quite simple. All I really know about the catalyst that has been used on exhausts is that it works quickly. While it does not immediately limit engine speed, it is still advised to remove the catalyst when tuning a scooter. A catalyst must function at temperatures over 2200 degrees Fahrenheit in order to perform properly. Unfortunately, when performance is increased.

          The easiest way to get rid of the scooter’s catalyst is to switch out the original exhaust with an aftermarket version. Alternatively, you may use a non-cat exhaust from the same scooter model without catalyst (Minarelli and Piaggio engines have typically similar models with no cat exhaust). Be careful buying a stock exhaust since they are typically far more expensive than an aftermarket component and, in the end, you will buy one anyway if tuning as a pastime.

          Without a professional, it is difficult to remove the catalyst from the exhaust as the exhaust would need to be cut open–requiring welding after removal. While this is possible, it’s generally not worth trying.

          Some catalyst exhausts include a hose that is linked to the transmission housing (Piaggio). This hose is used to keep the catalyst clean. When the catalyst exhaust valve is replaced, this hose should be removed and the hole in the engine block should be sealed.

          Drivers license restrictions

          Different nations have different regulations. Some jurisdictions allow scooters to be ridden without a drivers license, while others have several distinct licenses for various engine sizes.

          The manufacturer does not impose any of these limitations; instead, they’re usually put in place by third parties, so it’s not a restriction imposed by the scooter’s maker. The CDI is the major portion of the kit (a modified CDI and other components, such as removing the pillion seat to reduce compression).

          Keep in mind that these limitations are not standard and must be specified by the vendor. This also implies that if the components are replaced, they become yours exclusively. Make sure you get all of the required derestriction information and parts before making your purchase to avoid any confusion.

          Speed limits and legal restrictions

          The most prevalent restrictions on scooters nowadays are these, which is perhaps the reason you’re reading this post. In order to meet different speed limit regulations for scooters, the manufacturer must ensure that the scooter does not go faster than the legal maximum speed in the country where it is sold.

          On the other side, the manufacturer aims to develop engines that function well in terms of acceleration. This is at times contradictory to the speed restriction requirement, as quickly accelerating scooters may reach high speeds. To keep within limits while still having a powerful engine, various restrictions are put on the engine in order for the scooter to obtain its road legal approval.

          Most scooters come with one or more of the following restrictions:
          ⦁ Restrictions through added parts
          ⦁ Restrictions through replaced parts
          The phrase “additional parts” refers to the beneficial limits. These are the limitations that can be removed readily and without spending any money (if you have the proper equipment).

          On the other hand, restrictions caused by replaced components can’t simply be removed. They generally necessitate the purchase of an unrestricted part or a significant amount of modification. These parts include electronically limited CDIs, inlet manifold diameters that are restricted, and exhaust manifolds with extended lengths.

          The most common scooter engine restrictions

          Exhaust restriction

          If you own a scooter, you’re likely familiar with the exhaust restrictions placed on them. Fortunately, it’s easy to remove the restriction with a grinder—ideally a Dremel, Proxxon, or other micro grinder. Most stock exhausts have what is called a dummy pipe on the exhaust manifold as opposed to aftermarket restricted pipes that have welded diameter restrictors in the downpipe.
          Remove the fake pipe, cut it with a handsaw or a micro grinder as close to the manifold as possible. The exhaust hole must be promptly repaired. A washer should be welded over the aperture.

          The exhaust diameter restriction

          You can easily remove the diameter restriction from your street legal after market exhaust by grinding off the small welding spot that holds it in place. To avoid losing the restriction piece, you should build a hook out of some wire and secure its position before grinding.

          Other exhaust restrictions

          There are a few other exhaust restrictions to be aware of. For example, some stock exhausts use a very long exhaust manifold that can decrease gas flow and performance. These can only be replaced by buying a shortened version of the manifold.
          Another potential restriction can sometimes be found in the exhaust silencer of aftermarket exhausts (Yasuni). It can usually be removed by disassembling the silencer.

          Exhaust restrictors can be found in the exhaust silencer of aftermarket exhausts (Yasuni). It may be removed when taking apart the silencer.

          Exhaust Dummy Pipe

          The Exhaust Dummy Pipe is a type of exhaust pipe that is often found on stock exhausts.

          Shortened Tuning Manifold

          Shortened tuning manifold

          Inlet Diameter Restrictio

          Inlet diameter restriction usually found on aftermarket exhausts

          Exhaust Tip Diameter Restriction

          Exhaust tip diameter restriction

          Variomatic ring restriction

          The variomatic ring restricts the engine transmission from reaching its maximum gear ratio, limiting the top speed of the engine. Most of the people advice that it should be removed as it forces the engine to run at a high speed for most of time, grinding into and eventually breaking the aluminium variomatic.
          The variomatic ring is located on the crankshaft, making it difficult to remove without the proper tools. The best way to prevent the crankshaft from spinning is by purchasing a special blocking tool; though it may cost a few extra dollars, it will save you time and frustration in the long run.

          Remove the variomatic nut, which sits in between the two pulleys. It’s usually about 5mm thick. Keep in mind when you’re reassembling the variomatic, use Loctite (medium) or a comparable thread-locking adhesive to secure the crankshaft nut. Depending on your scooter type, a torque wrench should be used when tightening the nuts at 40-50nm.
          Piston stoppers may be tempting, but they can cause major damage to your scooter if used improperly. eBay has a wide selection of available blocking tools for your scooter that will do the job without damaging any crucial parts.

          Variomatic Blocking Tool

          A variomatic blocking tool

          Piston Stopper

          A piston stopper should be avoided.

          Screenshot 2022 09 25 210212

          The variomatic ring sits in between the two front pulleys

          Properly Blocked Variomatic

          A properly blocked variomatic ready for opening

          Carburator restriction

          The carburator is responsible for supplying a mixture of petrol and air to the cylinder. It is one of the engine’s most crucial parts. When the airflow or fuel mix becomes restricted, it limits an engine’s power potential. throttle opening and restricted airflow are common on scooter carburators in order keep performance low.

          Throttle opening restriction

          The throttle opening restriction is a result of the rider not being able to fully open the carburator. A limiter within the carburator blocks movement of the slider, preventing it from opening fully. To fix this problem, simply remove  the limiter so you can open the slider all the way.
          Petrol is dangerous and causes cancer. When working on the carburator, use gloves, avoid breathing in the petrol fumes, and don’t ingest any gasoline vapors.

          Carburator air supply restriction

          The air supply restriction is easy to spot. Just take the air filter hose off your car’s carburetor and look for a plate that blocks airflow into the carburetor when its throttle is open.

          Intake manifold restriction

          You’ll need to replace the intake manifold when you upgrade to a bigger carburator. Unfortunately, sometimes even the stock manifolds are too small for some carburators. Most standard carburators have a 12mm diameter, which means that the smallest point on your manifold must also be at least 12 mm wide–anything else and the carburator won’t operate efficiently.

          Air filter restrictions

          If air filter restrictions are genuinely implemented, it’s an open story. The complicated air flow of the air filter improves filtering efficacy, allowing the engine to operate effectively under any condition (as long as it’s not a sandstorm in the desert). These routing channels are said to limit airflow and therefore function as a barrier by some people.
          If you’re adjusting the air filter, be careful not to let too much fresh air into the mix. This can increase the temperature during ignition, and cause damage to your engine if it gets too hot. Make sure you adjust the carburetor according to how much air it’s processing, or you could end up with a costly repair bill

          Throttle Opening Restriction

          The throttle opening restriction is found in the slider shaft

          Slider Opening Restriction

          Slider opening restriction


          Look out for these restrictions when removing the air filter

          Air Supply Restriction

          Air supply restriction

          Restricted And Tuning Manifold

          Restricted and Tuning Manifold

          Air Filter Box Restriction

          Air filter box restriction

          Electronically limited CDI’s

          Do you know the electronically limited CDI is one of the few limitations that has no effect on the engine’s overall performance over time? The black CDI (Capacitor Discharge Ignition) piece of electronics manages the ignition process for the scooter. When CDI reaches a certain engine revenue, the limited CDI prevents the engine from revving any higher by stopping ignition of the spark plug. Buying an unrestricted CDI gets rid off this limitation.


          Can derestricting my scooter break the engine?

          In most instances, derestricting the scooter not only augments the engine's performance; it also allows for enhanced longevity. This is usually due to some containing parts that prevent the engine from running as intended. When restricting the engine, however, it is critical to make sure the carburetor is set up properly. To meet with higher engine earnings and a greater flow of fresh air supply, particularly the main jet may need to be increased. After derestricting the engine, your local scooter shop (if there is one) should know what adjustments are required.

          Do I loose my warranty when derestricting my scooter?

          The manufacturer and vendor of your scooter will determine this. Piaggio, for example, provides a complete warranty when the scooter is derestricted through a licensed dealer/repair shop. This might not be the case with other brands. Contact your manufacturer or local scooter store to find out whether restricting your engine has an impact on your warranty.

          Which Scooters have which Restriction applied?

          Please keep in mind that this only applies to 50cc scooters. There are some bigger engine models which may have restrictions, but it is less common for them to be affected Piaggio 2-Stroke The dummy pipe and the variator ring are generally installed on Piaggio engines. If you want to derestrict your engine but don't want to change it, the airbox is quite small and may be adjusted.
          Piaggio Injection
          The Piaggio Injection models have a restricted CDI.

          Minarelli / Yamaha 2-Stroke
          The Yamaha Minarelli engines have a dummy pipe and variator ring applied, similar to the Piaggio 2 Strokes.

          China Engines (GY, etc.) The CDI is standard on almost all Chinese engines. A variator ring and the carburator air intake restriction are also included in some!

          Honda Engines
          Many Honda engines have carburetor restrictions, which limits the air intake or prevents the throttle from opening fully. Some models also have variator rings!

          How do I know if my area has restriction laws for 50cc scooters?

          To find out if your area has restriction laws for 50cc scooters, you should start by checking your local traffic regulations. Look for any specific guidelines or requirements related to scooter engine size and speed limits.

          You can also contact your local Department of Motor Vehicles or visit their website to gather information on any restrictions that may be in place. Remember to always comply with the applicable laws and regulations to ensure your safety and legal compliance while riding a scooter.

          What tools and equipment do I need to gather before derestricting my scooter?

          Before derestricting your scooter, gather a few essential tools and equipment. You’ll need a set of wrenches to remove the exhaust, variator, and carburetor. Additionally, grab a needle nose pliers for adjusting the rollers and springs. Don’t forget safety gear like gloves and eye protection.

          With these tools on hand, you’ll be ready to tackle the derestriction process and unleash the full potential of your 50cc scooter.

          How can I locate the restrictive components on my scooter?

          To locate the restrictive components on your scooter, start by referring to the manufacturer’s manual or doing some online research specific to your scooter model. Look for information on speed restrictions or limitations. Pay attention to components like the variator, CDI (ignition) unit, and exhaust system as these can often be restricting factors.

          Additionally, visually inspecting your scooter may also reveal any physical devices that are limiting its performance.

          Are there any safety precautions I should take while removing the restrictive washers or plates?

          To ensure your safety while removing restrictive washers or plates from your scooter, there are a few precautions you should take.

          First, make sure to wear protective gear such as gloves and goggles to shield yourself from any potential hazards.

          Additionally, it’s important to disconnect the battery and let the engine cool down before starting any modifications.

          Finally, carefully follow the manufacturer’s instructions or consult a professional for guidance to avoid causing damage or voiding warranties.

          Can derestricting my scooter affect its warranty or legal status?

          Derestricting your scooter may potentially affect its warranty and legal status. Modifying the restrictions on a 50cc scooter can void the warranty, as it goes against the manufacturer’s intended design.

          Furthermore, depending on your local laws, removing these restrictions could make your scooter non-compliant with road regulations, resulting in fines or other penalties.

          It’s important to research and understand the potential consequences before making any modifications to your scooter.


          In conclusion, you can successfully derestrict your 50cc scooter and enhance its performance by following these steps. Remember to always check and understand the restriction laws in your area before making any modifications.

          With the necessary tools and equipment, locating and removing the restrictive components becomes easier. Adjusting the carburetor, modifying the transmission belt, and increasing the fuel mixture will further optimize your scooter’s performance.

          Lastly, regular maintenance and servicing will ensure that your scooter continues to run at its best. Enjoy your newfound freedom on the road!

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