Grehua Update Carburetor is the best carb for upgrading the Predator 420 cc engine. However, if you are looking for other options then go for TORCNC VM34 Carburetor and Dalom Carburetor. The options here are the best when it comes to giving a smooth performance ride and making sure that your engine is safe from wearing out.

Now, upgrading the Predator 420 carb is worth it if you are a competitive go-kart racer. But if you are a hobbyist then the stock carburetor which comes with the engine will work just fine. 

This is because modifying the engine here will improve your performance and give you an edge over the opponents. So, if you are looking to win all the races then you need to modify it with the carburetor. However, if you find out the reason for these carburetors then let’s get started.

Things To Consider Before Upgrading

Predator 420 Carb
Source: Youtube

Just like how the go-kart needs a few points to refurbish such as softening the tire or modifying the exterior, the engine needs an upgrade too. Now if you are going to upgrade the Predator 420 engine anyway, you need to remember a few points before you upgrade. 

Flange Adapter:

Flange adapter helps to make the transfer of motion from the carburetor to the engine. Regardless of what carburetor you buy, you need it to connect it to the engine. So, make sure to buy the adapter that helps your carburetor to work in sync with the engine. 

Intake Manifold Adapter:

Similarly, you need a good adapter to connect the intake manifold to the engine. Intake manifold is what helps the flow of air incoming from the engine to go properly to the cylinder. Make sure to buy a good intake manifold, I am going to recommend you to choose a 32mm billet intake manifold adapter. That will help efficient intake manifold performance. 

Intake Tube:

Air intake tube helps to bring in the clean air from the air filter to the throttle body and engine. Air intake tube length should depend on the engine’s RPM range. Considering you want to upgrade the Predator 420 cc engine, it’s RPM is about 6500. So, for such an engine the air intake tube should be about 13.5 inches long. 

Rubber Boot:

Finally, make sure to buy a good rubber boot as well. This helps to connect the adapter to the carburetor. 

Top Upgrade Options

Grehua Update Carburetor

Grehua Update Carburetor
Source: Amazon

The Best Carburetor for Predator 420 cc


  • Exterior: Chrome
  • Carburetor Height: 116 mm
  • Carburetor Width: 102 mm
  • Center Mounting Hole: 31 mm

Usually Includes:

  • 1x Carburetor
  • 1x Air Filter
  • 1x Adapter Kit
  • 1x Spark Plug
  • 1x Fuel Filter
  • 2x Nut
  • 2x Screw
  • 2x Gasket
  • 2x Main Jet
Large size air filter Made with high quality materialWidely AvailableSlightly costly

The best carburetor I recommend you get for the Predator 420 engine is the Grehua Update Carburetor. It gives a sizable performance boost. The response with this carb is smooth, and the operation is relatively easy. 

Going further into details, I was using this carb and the engine did not die on me once. I can say that the engine worked amazing after I made the upgrade. I got smooth performance even after hours of use. 

Moreover, I raced my friend with a similar build on K1 speed but with the stock carb and beat him fairly and square every time. I think the air filter and the fuel filter made with the ABS, fiber filter paper and the reinforced magnet helps to properly filter the impurities. . 

However, the main problem is to upgrade the carb. It can be overwhelming and you need to be cautious throughout the process. Now, don’t worry though, I have included a step by step guide on how to upgrade the carb to make it easier for you.  

TORCNC VM34 Carburetor

TORCNC VM34 Carburetor
Source: Amazon

Most Premium Carburetor for Predator 420 cc


  • Exterior: Machined
  • Flange Type: Bolt On
  • Throttle Diameter: 34 mm

Usually Includes:

  • 1x Carburetor
  • 1x Air Filter
  • 1x Intake Manifold with gasket, pulse fitting and plug 
  • 1x Intake Boot with HD Hose Clamps

Recommended Purchase:

  • Throttle Cable
Offers wide range of equipmentsGood option for both power and performanceWidely AvailableHas relatively the most weightMost costly option in the list

Now if you are not restricted by budget constraints then I am going to suggest you the TORCNC VM34 Carburetor. This 34mm carburetor is one of the best in the market, made all the way in Switzerland. So, you can already guess the quality you will get from this carb. 

The kit has bolt on power which helps to maintain a great throttle feel and works well with the performance kit. This comes with the machined exterior that also makes the air and fuel flow more efficient. 

After using this product, I was happy with the result but again the main problem is its cost. Besides, this is quite heavy compared to the other options in the list. So, once again this could be the best option if money is not an issue for you. 

Dalom Carburetor

Most Affordable Carburetor for Predator 420 cc

Usually Includes:

  • 1x Carburetor
  • 3x Gasket
  • 1x Fuel line
  • 1x Spark Plug
  • 1x Air Filter
  • 1x Fuel Shut-off valve
Has the widest option available for engine performance in terms of horse powerThe product kit comes with a fuel shut off valveLightest option in the listAffordableFuel Intake is slightly smallerCan have issues related to fuel leak

This is what I am going to suggest to you if cost is the main concern. With the Dalom carburetor you get amazing performance thanks to its throttle valve position. Now in terms of cost, you get a sweet deal from this.

Used it on my 420 cc engine and when I took it for racing, the performance was good. Even after hours of use, I got a smooth ride. The best part I believe is the diversity of HP options you get from this carburetor. Whether you want to shift it to 13 HP or 16 HP 420 cc engine, you will get optimum performance.

But it slightly lags when it comes to fuel intake. Compared to the other carbs in the list, I felt that the fuel intake is slightly smaller. Again, through long use the fuel leakage can also be an issue. If you decide to buy this, which I definitely recommend, then make sure you don’t purchase the wrong engine parts. Double check the engine model and the part numbers. 

How to Upgrade 420 Predator Carb

Let’s get into upgrading the carb straight away.

Tools Required:

  • Vibration Damper
  • Wire Cutters
  • Performance Carburetor Kit
  • Throttle Cable
  • Allen Wrench
  • Fender

Step 1: Start by removing the gas tank through disconnecting the gas line from the carburetor.

Step 2: After that remove the stock exhaust and stock airbox to get an access to the carburetor.

Step 3: Clean up the wiring and then remove the old carburetor from the setup. Grab the new carburetor, intake manifold and the hose which comes with the setup.

Step 4: Now install the carburetor properly and make sure to modify the throttle cable.

Step 5: After modifying, install a fender to protect the engine and carburetor from water splashing out.

Step 6: Connect back the stock exhaust, stock airbox and the gas tank. 

Step 7: Check the Go-Kart performance. 

Frequently Asked Questions (FAQs):

Can I Install a Carburetor on a 420 cc Predator Engine?

Yes, you can definitely install a carburetor on a 420 cc Predator engine. The process is simple and all you need to do is collect the right tools. Then make sure to remove the gas tank, stock exhaust and airbox. Finally, install the carburetor. 

What is the Recommended Jet Size For a Carburetor on 420 CC Predator Engine?

For a carburetor on a 420 cc Predator engine the recommended jet size is 0.042 or 0.043. This is mandatory for the best engine performance. It will work with all the air filters that have 2 to 7/16 inches inlet. 

What is the Recommended Material for a Carburetor Spacer on a 420 cc Predator?

The recommended material for a carburetor spacer on a 420 cc predator engine is phenolic resin and polymer. This is to enhance the velocity of air and fuel charge to overall build the low and mid range torque. 

Final Words

So that’s it when it comes to the Predator 420 carb upgrade. All of the products suggested here are the best carb you can go for. Hopefully with the products I recommended to you and the upgrading procedure, you will be able to upgrade the Predator 420 cc engine to its maximum. Make sure to follow the steps and enjoy the best performance from your go-kart.

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