Explained: Carburetion VS Fuel Injection

Did You Know | 27 Jul 2018

Explained: Carburetion VS Fuel Injection

Fuel Injected motorcycles are fast taking over carbureted ones, which until the beginning of the new millennium ruled the roost. It wasn’t until 1980 that fuel injection made its way on a street going bike. As things stand today, almost every premium motorcycle comes equipped with an FI system. So while the good old grease monkeys still swear by the reliability, tune-ability and serviceability of carburetors, newer riders believe that fuel injection is better in every way. So how exactly are these two systems work? How exactly are they different and what are their respective virtues and vices? Let’s find out!

Explore TVS Apache's new Bike with High Performance, Advanced Design, & Features. #RestlessToPlay
Know More


Carburetor is the most basic, and until recent times the most prevalent fuelling system used in two-wheelers, especially in India. To explain the basic working of a carburetor, think of it as a tube that feeds an air-fuel mixture into the cylinder from one end, with an air filter attached to another. Now, somewhere in the middle of this tube the air passage area is restricted to increase the velocity of the air passing through. This little area, or part of the carburetor system is known as venturi. By increasing the velocity of the air through the narrow area, a low pressure pocket is created, which in turn facilitates drawing fuel from a jet placed near the venturi through suction. This phenomenon is in line with Bernaulli’s principle which states that the velocity of a fluid (or air) passing through a tube is inversely proportional to the pressure created by it.

The amount of air sucked into the carburetor is decided by a valve at the end of the tube connected to the cylinder. This valve is termed as the throttle valve and is connected to the accelerator grip of your two-wheeler and controls the air-fuel flow through the throttle inputs provided by the rider. When you wring the throttle, the throttle valve opens – allowing a generous flow of air through the carburetor. Conversely, it’s closed when the throttle on the handlebar is fully rolled back.

The fuel jet, which is placed near the venturi draws its fuel directly from the fuel tank via a float chamber, which is a small reservoiur for fuel, with a float valve which cuts fuel supply when it’s full  and resumes it when the jet is drawing fuel from it. The resultant air-fuel mixture is then supplied to the cylinder where combustion takes place.

This is a very basic explanation of how a carburetor works, though modern carburetors including constant velocity or CV carburetors are generally more complex in design. These carburetors make use of components like a diaphragm, needle valve and pilot jet to control the air-fuel mixture. The important point to note here, though, is that this entire setup is rather simple and is fully mechanical with no electronics or sensors coming into play.

Fuel Injection

Unlike carburetors, a Fuel Injection system is comprised of a complex set of electronics and sensors. In carbureted systems the fuel gets drawn from the tank, while in a Fuel Injected system it depends on a fuel pump installed inside the tank for a fine-grained control over fuel flow. The fuel injection nozzle also goes directly inside the combustion chamber. The pressurised fuel is very well atomised as a homogenous mist in case of FI systems, allowing for very efficient and clean combustion.

The fuel supply in case of FI is controlled through an electric brain, or ECU, which constantly makes complex calculations at a very high frequency to deliver the best air-fuel mixture possible. Based on a whole variety of parameters such as engine speed, throttle position, engine temperature and load etc the ECU directs the injectors to let in just the right amount of fuel with every intake stroke to facilitate the most efficient combustion.

Now, while the efficacy of an FI system has been proven to be superior to carburetor, it’s not that the two systems don’t have their distinct advantages and disadvantages. Here, we will discuss the merits and pitfalls of the two systems in brief bullet points.

Advantages of carburetors

  • Carburetors cost less, are simple in operation and easy to repair or replace
  • Carburetors allow the users to tune them to their requirements
  • Since carburetors are not integrated into the engines, they can be serviced or replaced without touching the engine
  • Disadvantages of carburetors

  • Not the most efficient systems, dated design
  • Most carburetors have a slight lag, which results in relatively slow throttle response
  • Certain components like diaphragm are relatively delicate and prone to damage
  • Air fuel mixture fluctuates, affecting engine smoothness
  • Advantages of fuel injection

  • Optimised air-fuel mixture and atomisation allows for cleaner, more efficient combustion
  • Sharper throttle response
  • Better fuel efficiency and marginally more power than carbureted systems
  • They are typically maintenance free and does not break down
  • Disadvantages of fuel injection

  • Substantially more expensive than carburetors
  • Cannot be repaired with simple tools, have to be replaced, which is expensive.
  • Cannot be customised, unless you go for custom ECU maps, which again is expensive
  • So while the advantages of an FI system are pretty clear despite its cost, you’d still be one among millions who still put their faith in the good old carb. Which tech do you prefer, and why? Do let us know your opinions through comments below.

    Name is required field Name should be Alphabet only Name can not be morethan 30 characters!
    Email is required field. Email is required field. Email can not be morethan 50 characters!
    Comment is required field. Comment can not be morethan 300 characters!

    Comments (109)


    12 Jul 2021


    17 Jul 2021

    Shaikh mustaq Hasan muneer

    03 Aug 2021

    If we thought about future fuel injection system is good because the petrol prices increasing day by day. If people drive their bikes with rules and regulations then they will not face the problem of cost of fuel injection system.


    03 Aug 2021

    carburettors bikes are good.is e carburator bikes are low maintenance

    Douglas Makonya

    18 Aug 2021

    Thank you


    26 Aug 2021

    Error 523 [url=https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#523error]origin is unreachable[/url]


    03 Sep 2021


    03 Sep 2021

    Edmark Florentino

    29 Sep 2021

    Can help me to get a company job about automotive industry.


    30 Sep 2021

    Low price,simple

    Al Muntakim Anik

    11 Oct 2021

    I prefer FI engine, because it's sound is very good.


    12 Oct 2021

    I prefer EFI system. because, once you buy the EFI system vehicle you will not run to the Garage for maintenance off course most of the spares are expensive than Carburetor but this one is efficient, get more power, fuel economy and easy to know the malfunction.

    J Sravani

    14 Oct 2021



    15 Oct 2021



    15 Oct 2021


    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!

    Sithu Hpone Maw

    28 Oct 2021

    For me,I prefer the good old carburettor,since it is simplar than the FI system,it can be easily repaired too,btw thank you for the knowledge!


    01 Nov 2021



    01 Nov 2021



    29 Nov 2021



    29 Nov 2021



    20 Dec 2021



    28 Dec 2021



    28 Dec 2021



    08 Jan 2022



    08 Jan 2022


    Subash kumar

    17 Jan 2022

    Mujhe bhi chahiye

    Subash Kumar

    17 Jan 2022

    Mujhe bhi chahiye


    19 Jan 2022



    19 Jan 2022



    19 Jan 2022


    Samuel Muyodi

    24 Jan 2022

    Very much useful information

    Andrew Tafadzwa

    12 Feb 2022

    Very good


    21 Feb 2022



    21 Feb 2022


    Kumaresan T

    03 Mar 2022

    Fuel Injection system is the best one. It reduces the fuel wastage which is most important for countries like our India. Thank you!


    06 Mar 2022

    I still prefer carburetor, because I can repair it myself in the garage.

    Rohit kumar

    14 Mar 2022



    14 Mar 2022

    My bike theft has taken placemeri bike chori ho gai 7.2.2022 ko


    21 Mar 2022

    I love to ride bikes equipped with F.I technology specially my love TVs Apache rtr 200 4V

    Rajesh Kumar

    04 Apr 2022

    TVS Apache RTR

    Srinivasan Reghuraman

    18 Apr 2022

    Thank you for the crisp article of how the two work. I think carburetors were not given a chance to evolve into versions that could overcome their shortcomings. A critical working part of the motorcycle has become unnecessarily expensive now.

    Oteje Adeniyi Samuel

    28 Apr 2022

    I prefer carburator, in much case injector engine can not be operating without battery while in carburator if battery fail you can use starting rope to operate the engine.


    03 May 2022



    03 May 2022


    Mainak Debnath

    04 May 2022

    Old is gold

    Zakir Khan

    07 May 2022



    11 May 2022



    11 May 2022


    Deepak Kumar

    16 May 2022



    17 May 2022



    17 May 2022



    24 May 2022



    30 May 2022



    30 May 2022


    Mesfin Assefa

    07 Jun 2022

    I prefer injection type, because it can save full usage for long time until it need replaced.

    Deepu Singh

    12 Jun 2022

    Kuch nhi Chang hua fuel injector bekuf bna rhe ho sb log bina change kiye hi bta rhe ho

    Chris Carrier

    15 Jun 2022

    Great article, thank you.


    21 Jun 2022

    i like carb

    Ashraf ansari

    06 Jul 2022


    Pratod Dixit

    20 Jul 2022

    I prefer Carb. Why spend Rs.10000 more if I as end user is not getting significantly higher mileage ? I am an inventor and have invented "password protection anti theft security for bikes" in 1995. Would be great if bike manufacturer implements password protection on bikes

    Ritesh negi

    25 Jul 2022

    Very bed bike apache 200 =%=%Frequent stops on the way


    28 Jul 2022



    28 Jul 2022



    28 Jul 2022



    28 Jul 2022


    Divyanshu Joshi

    23 Oct 2022

    I buy apache RTR 160 BS6 1 year ago.. my bike is not give enough milage.. many time i checked, i get 30 KMPL to 35KMPL what i do ?


    06 Nov 2022

    Carvbrater thik hai

    Vikram kumar

    16 Jan 2023

    I want to replace


    24 Jan 2023


    Mohd Saleem saifi

    09 Feb 2023

    My bike engine problem big problem by gear util so bike speed problem

    Mussadiq khan

    08 Mar 2023



    10 Mar 2023

    I went to a few fowl sites you listed however they were in Russian. It is commonplace for singles interested by dating to search out one another at dance clubs, bars, courting websites or even on the dog park! Russian federation should join now begin dating web site is an singles love and get russia


    17 Mar 2023

    initial response on a FI vehicle to the throttle is vibration . The carburetor vehicle feels smoother at starting of the motion .

    Sarojkumar Sahu

    13 Apr 2023



    13 Apr 2023

    Radiometric dating, radioactive dating or radioisotope dating is a way which is used to date supplies reminiscent of rocks or carbon, wherein trace radioactive impurities have been selectively incorporated after they had been formed. But I'd still desire to keep my social media accounts free from th


    17 Apr 2023

    LatamDate is the web site the solutions are based on the common rate of interest of all the customers in locating their ideal suits and actual true love in this hectic globe. Your deals are risk-free and assured. Alicia strives to assist individuals discover risk-free matchmaking platforms for fulfi


    23 Apr 2023

    Our ideas for hosting a velocity dating event will assist you set up a gathering that is enjoyable, relaxing and fruitful for participants whereas preserving your sanity at the identical time. Harmony affords a assure that you can see the precise matches as a member or you get three months free. On


    27 Apr 2023

    Nevertheless, most of those individuals are single simply because they're consistently on the highway and that particular lifestyle doesn't enable them to have a daily dating life. These the thousands of single men and women africa have linked with lasting pals and as soon as-in-a-lifetime experienc

    Rahul Goyal

    29 Apr 2023

    FI is not good at all..as it is expensive and there is no reserve and chock system due to this.

    Albert Sinkala

    04 May 2023

    I would like the saturated car

    Sakedul hoque

    10 May 2023

    Not good

    Yogesh kumar

    26 May 2023

    Electronic fuel injection book


    03 Jun 2023


    U he jude

    19 Jun 2023

    I prefer carburetor than injector but what of propane carburetor user's

    Jasimuddin sk

    04 Jul 2023

    Kishan Soni

    09 Jul 2023

    Fuel pump motor kharab hai

    Vipin kumar gautam

    15 Aug 2023

    Fi system is worst. I had experienced it my apache 160 only one year old and I am faceing problems.

    Ajeet Kumar

    16 Aug 2023

    Dish porbanal


    16 Aug 2023



    22 Aug 2023

    Most of Apache RTR BS6 have oil leakage problem To Uper part of head near from typit cover exhausts uper side


    27 Nov 2023



    27 Nov 2023



    27 Nov 2023



    27 Nov 2023



    27 Nov 2023



    27 Nov 2023



    03 Dec 2023

    I still prefer the carburettor, because, in ETFI, one is forced to maintain a minimum of around 2.5 litres of petrol in the fuel tank, failing which the vehicle's engine will not fire up. If u still try to crank the engine with a lower amount of fuel in the fuel tank, it tends to damage the fuel pum

    Anand Kumar

    03 Dec 2023

    Next service should be careful complete.


    04 Dec 2023

    To guarantee your bond is strong and long-lasting, right here's what you ought to refrain from doing when dating a Russian Lady! Right here's what you require to understand: European dating applications offer something various than their American equivalents - they're extra concentrated on connectin


    07 Dec 2023

    A lady is least prone to be happy with a man who does not make her really feel particular or appears obsessive about himself. Make every effort to research your information to find your competition - you can make use of Bing to discover when your idea is unique and to check in your competitors to di


    11 Dec 2023

    Stonehenge is a powerful hyperlink to the as soon as-great peoples of the late Stone and Bronze Ages who went to great efforts to construct the monument. Each free and paid memberships are great that can assist you meet Latin American females on-line. Based by a Christian psychologist, eHarmony can