Carburetor adjustment and its importance in bike engine performance

To own a bike would be every man's dream and why not, to have one is an ultimate joy. There is a sense of freedom that only a bike rider can experience of riding bikes. They are a style statement for men and also the decent modes of commuting providing some economy to and from the work.

Any motorbikes we see today are definitely fuel efficient. Let us not talk about the Ducatis and the HDs for sometime; they are not bought for being fuel efficient.

So, bikes in general would ask for a little maintenance and they serve us long for whatever minimum care they receive. However, to keep your bike in ship shape and at optimum performance level, there are certain things that you need to do periodically; adjust or say tune the carburetor.

Carburetion is a little complex subject in bike maintenance only if you didn't know about it so far. Just a little understanding about it could actually chase your fears far and you can do the fine tuning at the comforts of your home on a regular basis saves on your time and penny and you and your bike will have a long life together.

Carburetor is a device that actually mixes the fuel and air to allow the process of combustion to happen which generates the power. In fact, engines per se would not function without a carburetor. Most bikes made lately are coming with digitalized fuel injectors which are a replacement to carburetors; however, carburetor is still a common thingy in many bikes. It doesn't hurt to have some idea about carburetors and their tweaking.

If the carburetor is not cleaned and tweaked regularly, then its ability to govern combustion process could be hampered, which results poor run and also poor mileage. Carburetor tweaking ensures that the engine receives right amount of fuel; not too less not too high, just that right amount. Tweaking the carburetor will so ensure fuel economy.

Things needed to carburetor adjustment:
A carburetor cleaner
Soft cotton cloth
An RPM guage

Using a bike carburetor cleaner(solvent) and take off the settled dust and dirt from your carburetor. See that all ports as well as the jets are cleaned. Then, slowly remove the oil deposits clogging which could deter the smooth idling of engine. For this take a clean cotton cloth and remove the deposits and the cleaner from the carburetor. Never use crude wires to remove deposits; which can actually ruin the calibration that your carburetor is set to.

Start the bike engine and idle it for a while until say the engine gets warmed up. You can figure out the mixture screw which will be present near the barrel on one side. It is actually at right angle to the carburetor barrel and a little below the half of the barrel's length.

Now remove vacuum hose/tube from the carburetor and fix RPM gauge to the port to which the vacuum hose was attached on the carburetor. The RPM gauge should be able to read RPMs of at least 1400 RPMs.

Using screwdriver slowly turn the mixture screw in a clockwise direction until the engine runs at max; high idling on a bike engine will be 1400 RPMs.

Now with the screwdriver turn the screw anticlockwise just until you hear the idle run to the point where it starts cutting off. Normal RPM will be around 1000.

Remove the RPM gauge and fix the vacuum hose to the vacuum port of the carburetor and ensure if the engine is smooth after removing the RPM gauge. In case you hear that the carburetor cuts out at the idle, just turn the idle screw a little up to a point where it is running at 1000 RPM range.

Written by .
Last updated on 18-03-2014. Published on 14-01-2010.
Published by Bikes4Sale in category Tips
Latest Comments. Share Your Opinion
Sir I have TVs Star city 110 old model it's gives very low mileage 1ltr fuel 30kmpl I repair so meny times mechanic but no improvement what problem in this bike
By Shaik Saidulu on 18-03-2022
Hello sir! I have new passion pro bike but RPM screw of the bike fell down ,i don't know where then how can i find that type RPM screw for my bike.
By Sunny Kumar on 09-06-2021
I am using a Yamaha FZ 2013 model. I tighten the RPM screw in anti-clockwise, but RPM is not getting increased and RPM is going down suddenly while driving. What is the problem?
By Ramanand on 01-09-2020
Mahindra canturo mileage bad 35 to 38 km
By Ashok Vasant Shemadkar on 13-10-2016
Hello sir I have TVs victor bike old model jiska milage 30 ka hai plz improve the milage
By Sachin on 23-09-2016
Help 38kmpl ka avrage
By Aman on 24-10-2016
Hello sir I have discover 110 mileage giving 36kmpl plz tell me how to adjust carburetor adjustment for good mileage
By Abhijeet Kumar on 25-10-2016
Hello sir I have CB shine 125 mileage giving 30 kmpl plz tell me how to adjust carburetor adjustment for good mileage
By Pradeep on 20-08-2016
hi sir.. I have splendor 2001 model my bikes milage is 72 klms, but edling is not stables, it is just holding and cutting but not dies engine, its just increasing decreasing, I want to stable edling and slow beating so what to do sir
By Abubakar, on 27-05-2016
All Mahindra centuro have the same problem.... I am also facing this problem. I am planning to go to consumer forum.
By Chandra on 21-05-2016
Yamaha FZS 2GS4 is having carburetor or nor
By Manojkumar Chowdary on 22-04-2016
sir im having hero honda splendor plus 2006 model im getting 55 kmpl, my bike was strucking (engine gets off).I changed slow race adjustment screw and cleaned carburator and petrol tank but the problem is not resolved How toget upto 70kmpl and resolve stopping problem
By Alagar on 26-03-2016
By Pradeep on 21-03-2016
Sir meri hero baike carburetor adjust meant
By Manish Rana on 21-03-2016
Hi my pulsar 150 ,15000 kms complete and now daily morning the bike rpm was raising, in the speed of 50 kmph the rpm normal range is 4k but in the morning time the same 50 kmph the rpm raise to 4200 rpm but once switch off and on the engine the rpm come to normal
By A.anilkumar on 22-02-2016
Please help
By Rohtash on 24-11-2015
6600 km chali hai
By Rohtash on 24-11-2015
Please halp me sir. I'm use discover100m top speed 100km more speed setting provided , mai kya kru aap muj ko Bta seething par 90km tak jati thi .mena seething ki hai carbatter ki fir 100km tak jati hai..kuch or bta do .jis sa bike ki speed or bad jay ..please help
By Rohtash on 24-11-2015
Such a useful information bro , am welcoming upload like this in future
By Azad on 26-12-2015
Hello there, my hero mastro 2014 model now has a slow speed problem. I was out of town for 3 months after that my scooter's slow speed is above 40...could u suggest a way to fix it..?
By Roshen Jacpb on 21-12-2015
pls help me i have xcd 135 cc its giving me 1liter 40km milage macanic says change ur cilender kit for milage .... pls help me its that solution to extending milage?????
By Rahul on 25-11-2015
hello sir, I have a yamaha Fz s from last 3 years. From last week onwards, my bike missed the start and air pass from curboreter when bike is slow. I checked my bike and cleaned the valve. But still it has the probleam. Please reply me what is the problem.
By Akash on 19-10-2015
Hello sir plz solve my problem. my bike Honda stunner milege problem .me jab isme 65 Rs 1Ltr petrol dalata hu to yeh 30 km chalti Hai' mene iskI kai service bhi karai Hai bhir bhi avg 30 ka hi deti Hai. Plz solve this problem any one thanking you
By Vikash Kumar on 19-10-2015
It super bike

Engine premium quility super. Reseting engine by a perfect mechanic. You get 75kmpl surely.
By Debasis on 08-10-2015
Hlo sir i hv a honda stunner bike.there is big problem,it's only leaking oil from air pipe.
By Birat Dev on 29-09-2015
I have a Honda stuuner 2008model. It does not take pick up while riding and sometime it stops automatically if I ride fast. And engine goes hot in normal running condition. Pls suggest
By John Majumdar on 22-09-2015
fuel can store the discover 125's carburetor while the engine and fuel valves are turned off
By Mortujashaikh on 15-09-2015
Hai.....i have a Discoved 100,2013 modelfor last 4months my bikes mileage is 35-40kmpl,what can I dooo......,plz give me a reply........i am just got mad,and what is the speed for this bike to get a good mileage
By Nandu on 04-09-2015
hi... i had discover 125T 4 valved engine ..... i had good mailage of 60KMPL..... but there is a problem of my engine sound it sounds too hardly and badly any suggestions plzzzz.........some of ma friends said its engine valve problem ..... but it was not fixed by bajaj service
By Rahul on 27-08-2015
Hi... i need help ..... i have bike Suzuki samurai last time i have repaired full engine but no pickup why it so like this??? Plz reply.....
By Roli Cme on 14-07-2015
First of all you need to tide off the lower screw pin and turn two round clock wise with screw driver and lastly adjust the solo rest.
By Roli Cme on 14-07-2015
I own pulsar 150 I get only 28 kmpl can i get more milege its 2010 model reply me.
By Nandy on 07-07-2015
I have Honda cb twister pls give me suggetion to set the carburetor as i get only 45kmpl.i cant get that where is its air screw.
By Mortuja on 18-08-2015
Hi sir, I have shine 125cc,the bike having a less milage n starting problems n also not giving agood speed,this problem is arise from after carbarator setting. What can I do then.....plz help
By Pramod on 17-08-2015
Put a new carb it costs from 1000rs to2000rs its cheap and how many km does u r bike ran
By Hrishikesh Shivgunde on 07-06-2015
I hv mahindra centuro o1. and it's giving only 30-35kmpl .. pls help me out.. in setting up the carburetor
By Rishi on 30-06-2015
Mere pass splendor nxg 2012 ki hai jisaka avg abhi 52 kmpl hai, pahle 75 kmpl avg multi thi, Maine local maicanic dikhaya to usane carbolator me setting kiya to 52 ka avg Milne laga, kripya app muje carbolator scew setting bataiye Kaise best average mile?
Pls help me sir.
By Prem Mumbai on 30-05-2015
my cbz bike is the verry low average 1 litter drive only 25 km pls solutions me pls an help me urgent
By Kunal on 10-06-2015
My suzuki samurai old model bike after repaireing whole engine by changing connecting bearing,engine bearing,oil seal, casket,clutch plate block piston ring etc... but no pick up while moving and when i started in nutel the pick up is fantastic.. so please help me out to solve the problem ??? Is it carburator problem or starting coil????
By Roli Cme on 24-05-2015
i have a cb trigger which is 2 months old and the bike won't go above 70 kmph ....and the milege i get is also poor its have very less pick up it takes so much time to even get to 50 kmph....
what should i do?
By Anand on 19-04-2015
Hi sir I. hve dicover 150cc bike it is not giviing proper milage so plz suggest me wat to do & its not going 100 km speed it'll get vibrate what to do is there a good service genteel in Bangalore near to Srinagar, plz suggest me
By Mahesh on 16-04-2015
cchange o ring and float gasket. also check air leakage from carburator. then tune air mixture screw 2 turn anticlock wise. you get 72kmpl. no affarid
By Debasis on 07-04-2015
also change o ring and float gasket.
By Debasis on 07-04-2015
change cdi and ignation coil. most baja bike affect by cdi unit. change cdi unit..then tune as per carburator manual. you can get surely 52kmpl.
By Debasis on 07-04-2015
i wanna know what's the secret buehind honda unicorn mileage....
By Allan on 23-04-2015
I have a hero im getting there any ways to increase my mileage...
any driving style,gear shift ratios...plz give me a soln....
By Allan on 23-04-2015
I HV passion x pro it gives 50km in 100 rupees how I improve the average and I want to tune carboretur
By Bunty on 01-05-2015
Dicocery 100 cc bike 2011 model.
By Somashekar on 04-04-2015
Sir by mistake engine oil nill. Bike sound is different. 1 ltr engine oil is nill with in weeak. So pls tell the solution or suggestions.
By Somashekar on 04-04-2015
I have unicorn dazzler which is give me 35 mileage . I have serviced my bike in next week spark plug engine oil air filter all are changed from honda showroom and machenic also do caburater setting but after this my bike is give me 35 kmpl what can i do
By Prince on 28-03-2015
Get cleaned your engine carb spark plug and right adjustment of Saree of carb will help to improve mileage
By Hrishi on 01-03-2015
Just take it look to the garage or to the showroom
By Hrishi on 01-03-2015
Hi sir I have a cd100 I am problem is autometically accelarate increase why sir
By Sujesh on 15-01-2015
Hello sir I have discover 150f mileage giving 30 kmpl plz tell me how to adjust carburetor adjustment for good mileage
By Omkar on 22-02-2015
Sir,i have discover100T bike,i want to best milage to bike and while going every 200 km after my bike has stopped on the traveling so advise to me for this problem
By K.somasubbi Reddy on 01-12-2014
i am sofe ahamed i am suffring problem of carburetor. my motercycle md byk100cc bajaj old modle
cont mb 9999408431. please in form us its to argent
By Safe Ahamed on 27-10-2014
i have suffering problem of Horse pipe leakage so they more lever high so they do not give better performance so pls. give me guaide for what to do?. i purchase that bike befor 7 month.
By Chirag Solanki on 15-10-2014
Sir,I have Suzuki maxR 100.I am getting 25kms per liter..I want improve millage..but I have one idea (I.e)..if we change carburetor of some other bikes which is getting more millage...then we can get millage some what better right..if possible please let me know which carburetor is suitable....please mail me to degala.premkumar@gmail..
By Prem Kumar on 31-10-2014
Hello sir I have a discover 100 cc bike 5 gear it gives on 1 liter /60 km mileage it is good or not .And it has automatic carburetor can be change platina100 carborator please send me mail
By on 08-11-2014
Hai sir,
i have pulser 150cc 2009 model. It gives low mailage. Can i change my pulser bike carburator to 100cc bike carburator. If i change which problems i get. Pick up and fast not matter to me. Plz tell me sir....
By Vinay on 18-09-2014
i want to buy hero glamour doesn't have any carburetor.will it be safe to buy this bike in terms of its longivity which is not having a carburetor & having a fuel injection engine?
By Shyama Choran Mukherjee on 29-09-2014
I have a 1982 sr250 yamaha and when I start the bike after about 15secs it starts to back fire and stall can you suggest what could be the cause please
By Peter on 21-08-2014
well said sir, i own a second hand xcd i wish to change the engine and fit a new one. Can boxers bm150 fit,? will it be compatible? if not, which one is?
By Collins on 23-08-2014
I have a problem with my bike discover 125cc 2006 model since 1 year and no one can solved that not even bajaj showroom service center the problem is that my bike engine got off if I run my bike at 50 km per hour and after off it not become on its only on when i stand it for 10-15 min plz help me for my bike problem
By Ravindra Singh on 18-06-2014
I want more information about carburetor
can u give plz
By Srisanth on 13-06-2014
I have Honda Unicorn 150cc bike,,
my bike mileage and pick up has dropped down drastically..
Can u suggest wat would be the major issue..
I left services Thrice but no use..
By Abhilash C on 06-06-2014
bike ke petrol tank se thoda sa petrol nikalkar chidak de aur maachis mar de sari problems khatam ho jayegi .
By Jijaji on 17-05-2014
my hero honda passion bike stops attomatically after 15 km when i run it on 50kmph and if i run it on 30 kmph it never stops kindly suggest
By Krish Rawat on 05-03-2014
MEri passion pro bike 45 se upar ki average nai de rai hai mai kai baar servic centre b gaya wo road test me 70 ki average dikha dete hai par on road 45 se upar nai aati average.plz help me anyone.
By Bunty Chandel on 13-02-2014
Mere paas passion pro 2011 model hai phle meri bike 65 tak ki average deti thi par ab wo 45 ki average de rahi hai.mai kai baar service cantre b ja chuka hu par unse b kuch theek nai ho pa raha hai kya is me koi meri help kar skta hai.
By Bunty Cyandel on 13-02-2014
i hv centuro but milege 30km per lit i m tired with dealer they dont hv expert to tune carbetor pls help some how to milege ...thax
By Faruk on 28-12-2013
I think there is problem in ur fuel regulator ( on, off,Reserver that swith) remove that device and clean throughly , petrol mixed dust in long run can cause that problem its common as the bike gets get older cleaning that must fix ur problem.
By Saroj on 30-10-2013
You should give answer with adio&video system thy aperson can adjust home u should also describe the setting of compan on carb like how many round screw should turn
By Akhilesh on 19-09-2013
I have bajaj discover dtsi 100cc bike . My bike carburator tunninng very bed so please explalan about carburater tunning so give some idea for this
By Vikash Kumar on 07-09-2013
Dear Sir

I have a Bajaj Pulsar 150 , 2009 model. I have issue with its average its only giving 25-30 Km/PL. Is the problem in the carburetor, should I replace the carburator I have been serviceing the carburetor 3 times in last 6 months.So help me what should I do.
Please Give me your Sujjestion' !!!
By Vikram Bharwal on 30-09-2013
hai friends i need help for descover 100cc engine assembiling guide .plz help him urgent
By Saran on 17-10-2013
Honda stunner cbf bike how to adzes carburetor
By M.senthilkumar on 04-09-2013
I Decided to start bike re-modeling shop . For that can you say the what type of machines and how much cost i need (rupees ).
By Anand.b.m on 27-07-2013
ya! definitely in the same way my mechanics just adjusted very well the carburetor screws and now my splendor is on fire with 85 kmps! enjoy buddy the boombastic ride>>>>>>>>>>.
By Mudassar on 25-06-2013
I have Suzuki Max 100 bike. Now a days while running sometimes it makes a big sound and suddenly engine stops. Next time when I start it does not give normal sound and while running for 10 to 15 meters it stops again. But If I keep the bike idle for 1 hr or so it runs normally.
Is it the problem of spark plug adjustment or something else.
Plz help.
By Rajiv on 05-06-2013
my bike carbureator's adjustment scru is jam plz give me some idea to improve mileage
By Vishal on 18-04-2013
By Muthukriahnn on 14-02-2013
Am studying diploma in mechanical I am preparing a project work plece some information in carburetor for study project please sir,,,
By Uday Kumar on 06-02-2013
By Sandeepyadav on 01-11-2012
Can i replace the main jet of cbr150 with that of unicon for a good milage??
By Tommy on 05-11-2012
ride the bike on the speed of 40 to 50 klmph and adjust the mixture screw of the carburator
By Shiva on 13-09-2012
40-45 shd b btr
By Shahid on 12-09-2012
My bike(pulsar150) gives 50-55 kmpl on highway but only 33-37 on local roads but it differs to 20km
By Shahid on 12-09-2012
hello sir i am having a Honda unicorn bike for the last few month i am facing the i dealing problem in my bike the race of the engine increases or decreases by it self i have shown to 2 or more service center no one is able to solve the problem i have also changed the clutch wire, acceleration wire,choke wire sir please give me a good replay
By Balaji Naidu on 16-07-2012
By Umer on 04-08-2012
just stay at home
By Habi on 09-08-2012
Hai sir,
i have pulser 150cc 2009 model. It gives low mailage. Can i change my pulser bike carburator to 100cc bike carburator. If i change which problems i get. Pick up and fast not matter to me. Plz tell me sir....
By Sagar on 12-08-2012
By Gautam Jain on 20-06-2012
I have a Honda CB Shine 125cc(Model 2010).

When I riding my bike it's runs normally, but i maintain my speed if i reduce and give the pickup, at the time bike was created sum noise even through it was switched off and it's gives very poor millage(40/L).

Kindly give the solution.

By Kesavan on 08-06-2012
By Gautam Jain on 20-06-2012
This is Er.Alok ,your article is fake,the exact trick for tuning is not clear,while rotating screw,when to stop? at max rpm of engine?
By Alok Yadav on 06-05-2012
hello sir,
i'v got bajaj discover 150cc bikes carburator really working bad nd i want more about carburter and its tuning , fuel efficiency is very low ,,, how to increase mileage by adjusting carburetor, so i want detils
By Shijil on 30-04-2012
i have yamaha libero G5.Its average is very low. pls sugges me ,how to make it properly good ?
By Vishal Doshi on 02-04-2012
i'v got bajaj discover 100cc bikes carburator really working bad nd i want more about carburter and its tuning , fuel efficiency is very low ,,, how to increase mileage by adjusting carburetor, so i want detils
By Chandramohan on 27-03-2012
i want to take some picture in my knowledge about engine of bike .
By Anil on 24-03-2012
i am a passion pro custmer. i want more about carburter and its tuning .
By Antison Ka on 22-03-2012
i want to adjust the corborater in suzuki samurai bike how is that
By Vinaykumar on 11-03-2012
i'v got suzuki shaolin bikes carburator really working bad nd m really ahead for porting it nd mke it done for more higher end speed........... plz suggest
By Shan on 14-03-2012
I have a Yamaha SR 250 which I bought second hand . When the weather is cooler and I start the bike it starts runs for a few seconds and then it cuts off . I start the bike with the choke out when this happens. There after the bike will not start with electric starter. I eventual am able to start the bike if I run start down a long hill. Please let me know what the problem could be.
By Kevin on 04-03-2012
Hello sir
I need to know how much amount of fuel can store the discover 125's carburetor while the engine and fuel valves are turned off


By Prajeesh on 09-01-2012
I have Honda stunner PGM-fi 2010 model.
pls give me suggetion to set the carburetor as i get only 45kmpl.
i cant get that where is its air screw.

Thanks a lot
By Nafis on 17-01-2012
I am no mechanic but I would like to find tricks to increase the speed of my bike. thank you for answer
By Ulrich on 16-12-2011
i am using cb unicorn dazzler... fuel efficiency is very low ,,, how to increase mileage by adjusting carburetor
By Daniel on 04-02-2012
Hai .am using bajaj xcd 135 .yesterday while driving it stops suddenly even petrol was full . It stops usually like when petrol is going to finish .but bike has enough petrol in it. After 2 mins of stop bike again starts.i want to know what is the cause for that
By Cijoe on 05-11-2011
how can i improve my bike milage . i have libero G5.
By Mithlesh Kumar Singh on 13-08-2011
i have a 1995 model kpajaj 4s champion its givw me a 34km milage after service the engine give me any ideas
By S.riyas on 10-08-2011
Hallo sir, I have passion plus. I want to improve performamnce of my byke so pls give me the detailed process with possible photographs.

pls reply
By Yogesh Bhamare on 04-08-2011
how can i improve the milage of my bike
By Suresh Kumar on 26-07-2011
hi sir i like it your artical sir i have a hero Honda spelenter plus but my bike gives a low millage what to do sir
By Vinoth on 12-07-2011
By Sandy on 10-03-2011
heloo sir iam very interested in mechanism can u mail me the basic operations about the Carburetor . mail meat .this was my request i wil try the same
By Prasad on 06-03-2011
i hv a pulsor 2002 model ,frm last 1 yr itz givng low mileage plz advice me to improve mileage and to make it run faster like new bike without any loud noise as it found in pulssor with age
By Sha on 21-10-2010
i have 2009 krizma r bike my bike given 20&25 km/l milege
i am going to highway my mixure jet is lost i am purchse new jet
pls adjustment carburetor
By Rohit on 04-09-2010
I have a 1969. Last one year iam not used and cared. now every thing corroded .petrol tank leak milege drop. But after one and half year without any hesitation he came with me for a long ride. I changed oil and spark plug fuel tank cleaned little bit. started within fifth touch. milege is very low i thing 15 km. once again i will improve with your suggetion i dont have RPM METER
By Jayachand on 09-05-2010
i like it
By Vishal on 30-01-2010
Sir, is it possible to replacement Bajaj CT 100 cc carburetor in the place of pulser 150 cc.if it is possible then tell me advantages and disadvantages.
By Padda Raju on 04-11-2017
Add Your Comment
Name :

Comment :