How To Convert Carburetors To Fuel Injection On Motorcycles?


How To Convert Carburetors To Fuel Injection On Motorcycles

While carburetors and traditional fuel injectors have long been around, an increasing number of riders are opting to convert their motorcycles to fuel injection owing to the many advantages these provide. If you’re searching for the smartest method of converting a motorbike’s carburetor to fuel injection, look no further than this article. 

A carburetor on a dirt bike or a motorcycle could be transformed into a fuel injection by employing the electric fuel injection (EFI) module. The tough aspect is finding the appropriate EFI kit to use on your bike since carburetor conversion is fairly simple. Just gain access to your carburetor and attach the EFI, sensors, and fuel pump to power.

If you’re wondering how to convert your regular motorcycle or dirt bike’s carburetor to fuel injection, continue reading because this article will walk you through the step-by-step procedure. Let’s get started. 

8 DIY Steps To Convert Carburetor To Fuel Injection On A Motorcycle: 

A carburetor is replaced by a fuel injection system in a fuel injection conversion.

The use of a conversion kit known as an ‘EFI kit’ developed for fuel injections simplifies the overall process. EFI (electronic fuel injection) improves fuel economy and performance.

The following is a step-by-step method for converting a carbureted motorcycle or dirt bike to fuel injection:

Step-1: Install The EFI Kit

Whether you’re converting to fuel injection for optimizing economy/mileage or increasing horsepower, an EFI conversion kit is always mandatory. The kit includes the sensors, ECU computer, and throttle bodies that would substitute the carburetor.

People who are unfamiliar with these components need to be aware of the fact that an ECU computer is necessary to perform fuel calculations utilizing the sensor’s input. Typically, a fuel pump with high output is required to match the system’s needs. 

However, to install the EFI kit, start the first step by removing the rider’s seat. Unplug the battery wires and shut off the fuel petcock. Additionally, the fuel line must be disconnected from the fuel petcock and the gas tank must be removed.

Step-2: Disconnect The Entire Fuel System 

In this step, remove the carburetor’s fuel lines and throttle linkages. Take off the carburetors. Disconnect and label the fuel pump’s electrical wires. Then, disconnect the fuel pump plus any associated fuel lines. My recommendation is to either mark or take photographs of them on your cell phone so you can recall how to rejoin them. 

Step-3: Fix The Wiring Unit

Following that, locate the ignition circuit wiring connector in the main circuit board or wiring harness. Remove the stock connector and replace it with the new one included in the EFI kit. The wires should be set on the ECU computer before attaching the universal bracket (included in the kit) to the motorbike. Now, the wires have to be fed to the bracket. Now it’s time to route the wires to the bracket. 

Step-4: Install The Oxygen Sensor

Start installing the oxygen sensors next to the first cylinder of the engine according to the instruction manual provided with the kit. Again here, the sensor cable must be routed to the bracket for it to interact with the ECU computer. 

Step-5: Take Access Of The ECU

Intake air sensors might be tricky to install, but if you put them right next to the fuel injection throttle bodies, you shouldn’t have too much trouble. The optimal solution, in this case, is to put the throttle bodies directly on the intake manifolds, adjacent to the cylinder heads. The wires from the sensors must be routed towards the bracket or mount to gain access to the ECU.

Step-6: Attach The Sensor Cables

After securing the ECU to the universal bracket or mount, it’s time to attach the sensor cables to the ECU using the guidelines and color codes provided within the wiring diagram. 

Step-7: Install A New Pump

The new high-output pump must be installed in the same place as the old fuel pump. Take extra care while linking the fuel connections or lines at the fuel pump and the EFI throttle bodies. Fortunately, you can connect the terminals on the fuel pump in the correct sequence by following the labeled electrical lines or by using the photo you captured in step-2. 

Step-8: Check The Functioning

The throttle linkages may now be restored to the newly installed throttle bodies. You can accomplish this by employing the keepers and clips included in the EFC kit. While adjusting the linkages, you may twist the grip of the throttle to check that they are operating correctly. 

The next phase is to reinstall the gas tank. Then the fuel lines situated in the petcock need to be connected to the newly installed fuel pump via clamps. Finally, reattach the battery wires. 

FAQs Regarding How To Convert Carburetor To Fuel Injection On A Motorcycle: 

What Is A Motorcycle EFI? 

Simply put, a motorcycle EFI (Electronic Fuel Injection) system is a computer-controlled mechanism applied for fuel delivery. This system’s ECU (Electronic Control Unit) receives data from multiple sensors positioned throughout the motorcycle and determines the amount of fuel necessary to enable the engine, depending on that data. 

The EFI improves the fuel economy and overall performance of a motorbike. A carburetor module is replaced by a fuel injection system in a fuel injection conversion. The use of a conversion kit known as an ‘EFI kit’ developed for fuel injections simplifies the entire process.

Can You Convert A Carbureted Motorcycle To A Fuel Injected Motorcycle? 

You certainly can convert a carbureted motorcycle to a fuel-injected one with the help of an FIC (fuel injection conversion) kit. The majority of modern motorbikes already come equipped with computer-controlled fuel injection systems. However, if you wish to convert an earlier carbureted motorcycle, it is quite achievable.

The fuel injection conversions replace the carburetors on motorbikes that have a built-in fuel injection system. The whole procedure is simplified through the usage of a fuel conversion module or kit referred to as an ‘EFI kit’ designed for fuel injections. Electronic fuel injection (EFI) technology enhances a motorcycles’ fuel mileage and overall performance.

How Do You Convert Your Carburetor To Fuel Injection? 

In terms of engines that have been in operation for a long period, you may purchase a fuel injection system as well as all other components which the manufacturer developed for a particular engine when they switched from the carburetion system to the fuel injection one.

A conversion kit is available in the market. By assembling and installing the kit which includes all the required electronics components, fuel injectors, manifold, and some other items, you can finish the conversion.

Is A Carburetor Better Than Fuel Injection? 

The FI (fuel injection) systems can fairly be considered better than carburetors regarding the fact that they reduce vibration and enable you to get over steep hills, which is what off-roading is all about. However, which is particularly ideal for you is entirely reliant on your geographical specification and driving style.

It’s quite evident that the majority of automobiles will transition to the FI systems shortly owing to the reduced emissions. Nonetheless, until the expenses of these systems significantly fall, there will continue to be a sizable following of carburetors.

In terms of pure horsepower, the FI technology adds just roughly ten additional horsepower at maximum. On the other hand, the ability to continuously fine-tune the fuel as well as the air intake for every cylinder improves performance.

What Is The Difference Between EFI And Carburetor? 

The main difference between fuel injection and carburetors is that fuel injection (FI) systems atomize the fuel via a small nozzle at high pressure, whereas carburetors work by drawing fuel right into the air stream via a suction produced by intake air-driven via a venturi tube.

The carburetor is a mechanism for mixing air and fuel in an internal combustion engine. On the contrary, EFI is a system that electronically injects fuel into an internal combustion engine. Through the throttle, valve air enters the venturi tube causing low pressures so that the carburetor sucks in fuel from a jet. 

How Much Does It Cost To Go From Carburetor To Fuel Injection?

Generally, the whole process of going from carburetor to fuel injection costs around $20-$30 and it can vary depending on several factors. Anyway, usually, it will cost you an extra $15-$20 if you convert it into a motorcycle garage. To save your money, you can follow the DIY methods to convert a carburetor to a fuel injection motorcycle.

Final Remark: 

There are several reasons why carburetors are only seen on classic motorcycles. Fuel Injection is a superior alternative since it produces more power, emits less pollution, and improves fuel efficiency. 

If you’ve been planning to convert your vintage carbureted motorcycle to EFI anytime soon, this article will hopefully come in handy for you. 

Ahsan Ullah

Hi guys, This is Ahsan Ullah. I have been riding motorcycle for more than 15 years. In this long period, I have experienced a lot of things about bike riding. Now I am trying to share my experience with you on this website.

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