Did this video help you out? Consider giving "THANKS" ❤ to help make more videos like this.

You are god-sent! It's great to have videos like this, learned a lot! I have a Honda Shadow which doesn't turn over for some reason, this can be helpful in so many ways! ^^

Thanks for the quick reply. I recently cleaned the carb bowl and jets due to a green color build up junk all on the inside, im guessing from using ethanol cut gas. I should be getting a rebuild kit in within a week or two. Thanks again for your time. Have a good one!

Nice video. Thanks!

Hello junkman, thank you for those video's they are really helpful! I have a 'Khen-Tai' carburator which has the exact same problem, but there are no replacement parts for it, so i bought a new one. But i can't find jet's for them, it's a 'PZ27' carburator, any tips? Thank you in advance!

Hi Junkman learned alot from your vid. I have a question. Before I rebuilt my 400cc yamaha kodiak atv carb it was idling fine, but would bog out when I gave it more then 1/4 throttle or more. Since installing the rebuild kit, it no longer bogs and revs up great, but it idles too high.The idle adjustment screw located near the throttle cable seems to have no effect. Is there another adjustment that I missed? The carb is a slide valve Mikuni. Thanks

Hi Junkman, thanks for the great info. Can ethanol cut fuel cause problems in the carburettor ?

Hey junk man I have a 03crf450 and it leaks gas out of it I rebuilt it and it is still overflowing and it is a pain in the butt to start up when it is cold and I have to put it on choke then it usually starts right up need help thanks

Well depending on the carburetor it can be just another name for the pilot jet, however a few carburetors have a pilot and slow jet (as they call it) as well as a main jet. In these carburetors the slow jet is to provide a smoother transition to from the pilot (only in operation at idle speed) to the main jet. They are usually only found on CV type carbs.

@thejunkman what is the function of the pilot or slow jet in operation of the carb???

Very informative

Hi can you go over the parts inside the manifold because I lost the part that makes my scooter run quiet. It looks like baby bottle nipple with a spring inside of it

@altlandf Changing a combination of the pilot and main jet (go up/bigger numbers) is what your going to have to do. Ethanol is not really much of a problem in pump gas as long as your jetting is correct for the elevation, air temp and density. Also running a stabilizer in the fuel will help the fuel stay at its best. Ethanol doesn't cause overheating, lean jetting does.

My 92' dr 650 seems to be flooding itself while at and idle, it will stall at stoplights and even clutch shifts from second to first. Would a typical carb kit likely fix this problem? Did I even diagnose the problem correctly?

Hello! I have a CBR 600 F3 '98. And I have problems in cold start. Once is hot starts with no problem. I had replaced the sparks. My bike was in the garage for aprox 10-12 weeks. Should I take the carbs off, disassembly and clean them up. Would this be the problem? Thanks in advance. Ed

I have a 2006 Yamaha Big Bear 400. From half throttle to WOT there is no power at all. Would the culprit be a bad diaphragm? Any advice would be greatly appreciated! Thanks in advance!

That's a Mikuni Carby, ain't it? It looks nearly identical to my carb. Question... if that miserable little pin for the floats is stuck (can't seem to pry it out) what would you recommend I do to get that thing out? The bike has had some horrid maintenance.

from what i read its usually just dirty am i better off just cleaning my carb? i put money down on a kit to rebuild but dont wanna spend 100 if i dont have too. i need to fix it asap though. it seams to be leaking out side of the carb and its deff from the carb itself

i have a honda shadow 750 and i want t customize the stock pipes, im told i would have to re jet, any pointers for someone who has no idea how the carb works?

you said your atv or something was not running right? after you did that to the carb did it run good or was it still running bad?

So i just bought a 92 ninja 600 and it ran fine when i was test driving it, but as i rode off with it i noticed it started to bog down and then when i went to stop it just died before i even stopped. After riding it for a few more minutes it would start but wouldn't idle. it would just bog down and die. If i left it alone for 15, 20 minutes it started right up with no problems idling. but then same thing after riding it for a few. im thinking this is a carb problem??

I live in Pa and right now the temps are around 25 to 45 degrees out. The problem I am having it's hard to start. Once it warms up it runs pretty good. How do I get more fuel to the engine when it's cold. Another thing in our area we have this garbage called ethanol in the gas. It's suppose to be less than 10 percent but I think it's causing my Honda CM 250 to overheat. This is a air cooled engine. How do I get the carb to run richer? I think with the ethanol it's running way too lean.

What did that carb come off of ,,I have the same on my Chinese for-wheeler

Great video, this seems to be the only one I can find based on the mikuni bst34. I'm rebuild one for a friend's yamaha ttr 225 and It's having a problem with leaking through the float bowl drain. I would just assume it's a float issue if it were any other carb, but since this one was ridden pretty hard the nipple for the drain line was broken off. I'm afraid this caused a small crack that's allowing fuel to bypass the stop screw. I can't find replacement bowls anywhere. Do you perhaps know where I could get my hands on one?

@thejunkman

8 жыл бұрын

+Dylan Headrick Ebay is your best shot.

@dmo848

2 жыл бұрын

Jb weld will be your best buddy for that

good!

Hello junkman, How about a vid with your approach to tuning a 125 2 stroke carb-and common issues with them...?

@thejunkman

9 жыл бұрын

sonaramic I already have a few videos on that. ALL carburetors work similarly so the techniques shown are universal to 2 or 4 stroke carburetors. I have a whole page on my website devoted to it. Link in the description OR here www.thejunkmanadv.com/motorcycle-carburetor-jetting.html This should guide you in what parts or areas to tune. I am always adding videos to my website (not necessarily here on KZread) so check the main page or "all videos" for constant updates. Also I post all my new content to my blog as well.

@patriciavittner2362

9 жыл бұрын

thejunkman i have a tao tao i bought a brand new carb. any adj needed? it wont idle correctly. the air screw is at 2 turns. bigger main jet? the idle is funny it goes up and down. ideas?

@thejunkman

9 жыл бұрын

Patricia Vittner Yes you will need to jet the carb as it did not come with the machine. It will need some adjustment to the machine you are putting it on. The main jet does not have anything to do with the idle quality. Read up on my carburetor jetting page and it will give you an idea of what setting(s) to change. www.thejunkmanadv.com/motorcycle-carburetor-jetting.html

hey junkman! question how do you adjust the needle jet or how do you read the manual for setting?my needle clip position 5E31-3/5 so how do i read that? it 1987 yamaha tt225 thankyou

@thejunkman

8 жыл бұрын

+GERMAN SHEPARD How do you read the manual? I am not sure how to answer that, the manual should have a table and a description on how to do it for your specific bike. 5E31-3/5 is the needle profile, not the clip position. The manual will state the clip position (if adjustable). I have a jetting page on my website (link in the description) that will help you understand the other adjustments. However the first thing is to return the carburetor back to factory specs per the manual.

what made u think the float was bad if it didnt have fuel in it? u could test it by gettin it hot maybe run it under hot water, then submerge it in cold water so if it does have any cracks itll pull water in when as cools

@thejunkman

3 жыл бұрын

That is a good little tip!

evry time i press on The gas The engin wants to turn of?

Where do I find the spects of my carb? I would like to know the correct distance or adjuntment of the flote. its a 2003 artic cat 250 2x4 :) Thank you :)

@thejunkman

4 жыл бұрын

That is easy. It is listed in your service manual.

I just bought a (04 Suzuki ltz 400) it starts but it does not stay running long, I was told to replace the (carb) because it was staying choked,flodded..so I bought a brand new from ebay $149.00. put it in my self very carfully step by step and now it wont start, any hints on this matter - what went wrong?? I thought that by just putting the new one in it would start quick

@thejunkman

10 жыл бұрын

Not sure why you bought a new carburetor. Carburetors don't go "bad" unless they get physically damaged and your "old" one is probably fine. Have you checked to see if the new carburetor is even jetted to the correct factory specs? Sounds like you are not getting any fuel. Also for faster answers from me please leave your comment on my site. I hate KZread commenting system so much it is hard to find or answer questions here.

any chance of doing a regulator/rectifier check off the bike I have a 300bayou klf

@thejunkman

10 жыл бұрын

Probably not for that exact machine, however your service manual will show you how. I might make a general video some time in the future. Keep checking www.thejunkmanadv.com frequently for updates. Or "like" my facebook page.

@thejunkman what is the function of the slow jet in operation of the carb

@arberfilms2302

2 жыл бұрын

To allow the machine to idle.

question i found out about my jet needle on my 1987 tt225 it has 5 notches it's currently in the middle with a clip, the lower you put the clip the bike run rich, the higher you go it runs leaner, what would you set it at? the manual does not state what to set it at! also if i set my air fuel mixer screw under 3 1/2 turn the bike runs ruff and the manual states 2 1/2 to 3/4 turns?

@thejunkman

8 жыл бұрын

+GERMAN SHEPARD Start in the middle position and then test from there. Read about jetting on my jetting page for recommendations on maybe a main jet change if going to the extremes on the clip position doesn't help.

@dmo848

2 жыл бұрын

2 and 7/8 manual says

i need help i got a 1986 Kawasaki Bayou KLF300 and i took the carb off and its the same carb but maybe a little older maybe but i took it apart and cleaned everything and putted everything back in the way it came out and checked all my gas lines and plug and my spark plug ani't getting gas from the carb the float and bowl is getting gas to it but the carb ani't giving gas to the spark plug what could it be ??

@thejunkman

8 жыл бұрын

+jeff 16 When you had it apart did you check all the settings per the service manual? The float needle valve is what controls the fuel flow into the carburetor, if the float height is too high or too low this will affect how the fuel enters the carburetor bowl. Sound too low from your description. You will need the service manual to set it properly as carburetors vary from machine to machine in their settings. Also the needle valve itself could be stuck or worn, replace if needed.

sir junkman?may i ask u something, in your own opinion,what is the best carb is it diaphram or the other one?thanks

@thejunkman

8 жыл бұрын

Neither is better than the other. They both do the same function, just with a slightly different design.

It is fairly possible that the diaphragm is the problem. The only real way to know is to disassemble the carburetor and inspect it for tears or pin holes. I also could be a blocked passage with dirt or varnish from old or poor fuel.

i think this type of carb is a diaphram rigth?like in my suzuki raider 150 cc underbone bike.

@thejunkman

8 жыл бұрын

+mark alexis capili yes

It fixed the problem. The problem was fuel leaking past the needle valve seat via that o-ring or a poor seal of the tip of the needle valve itself.

Anybody got any ideas I have a bigred 250 runs fine and idials perfect when it's after it warms up will only idial for a few seconds I've adjusted everything. Thanks

@thejunkman

6 жыл бұрын

That means your running too rich. However start by setting the carb to the factory specs first. Usually that is the fix.

James, clean your carb really good. Clean petcock and check fuel lines ,gas tank may need cleaned and may be a filter in it as well that needs replacing or cleaned. Clean air filter as well.

@thejunkman

9 жыл бұрын

Yep, good advice. I also have a video and page for cleaning the fuel system www.thejunkmanadv.com/fuel-system-cleaning.html

hey junkman, my bike wont start , take off the air box dump a bit of fuel in there, it starts and will continue to start all day . next morning wont start . . .it is a yamaha nouvu 2 , its getting fuel to the carb (fuel line off ,crank the engine, fuel comes out) . strange thing is once i get it started it runs all day fine , starts no problem. but if it sits for more than 12 hours. it will start for a second then die and will not start for anything . .until i pour a bit of gas where the air box connects. i thought if i understood carbs with these symptoms the problem would be obvious. but perhaps not

The needle valve is stuck in its seat. Clean or replace the needle valve and seat.

What carb is that on the videio (model)? Im having a hard time trying to find a carb like that. Thanks

@thejunkman

7 жыл бұрын

The carb I used for this demonstration is off a Suzuki DR200 a Mikuni BST31S

Well good deal.

I need one of those retain screws have any idea where I can get 1.

@thejunkman

6 жыл бұрын

The float bowl screws?

@TheThehitman18

6 жыл бұрын

Its the really short one that holds the seat in the flat washer screw

@thejunkman

6 жыл бұрын

Got to an OEM parts supplier and find it on the diagram. That is how you can purchase one.

I have a Yamaha Grizzly 660, 2002. It runs good, but, fuel leaks from the carberator bowl drain hose. How can I fix this leak?

@thejunkman

10 жыл бұрын

Wit the information in this video. It tells you everything you need to know. If you have more questions leave them on the website www.thejunkmanadv.com/how-to-basic-carburetor-disassembly-and-diagnosis.html

@dmo848

2 жыл бұрын

Turn the screw back n forth if not take apart n bend the tang. The part it sits on

That was my carb. And I didnt check this problem even though it was overflowing.thanx

@thejunkman

6 жыл бұрын

Glad it helped

Short answer is yes, however ALL fuels today can have their problems if left sitting for long periods of time without using a fuel stabilizer. Key to success with any fuel you use in a carburetor equipped machine is to consistently use a stabilizer so if the machine has to sit for weeks on end the fuel will not varnish or "flash off" leaving deposits that can clog jets, passages or deteriorate rubber seals. Check out my website for more info.

Are brass floats better than plastics? In meaning of maintinance.

@thejunkman

7 жыл бұрын

+Primagen Ostarrichi they are about the same

@PrimagenVanAtlantisLichtspiele

7 жыл бұрын

Thanks

Help !!!!!!!!!! Hey man so I have a question I need your help So I was riding home one day and I ran out of gas I turn my Petcock switch to reserve then I went to the gas station I didn’t turn the Petcock switch back to the on position The bike is working fine it’s seem to be at least I get back on the freeway and it works fine but ever since then if I try to hold high speed for long periods of time the fight starts to bog and will eventually cut off If I don’t let off if anyone knows anything please let me know it would be a huge help I have a Suzuki katana 2006 750

@thejunkman

6 жыл бұрын

You probably have some debris that is only partially blocking a passage in the carburetor. When you turned the petcock it probably dislodged some old dirt or varnish. Or possible debris on the bottom of the tank caused it since when you turn to reserve it allows the fuel to flow from the bottom of the tank versus the dip tube via the "on" product.

@deet4787

6 жыл бұрын

Thanks

Please post any follow up questions on my website in the comments (link in the description) as I don't have enough space to properly answer your question here. Check the fuel tank venting first, your symptoms seem to point to that but there are other things to check as well. Leave a comment on the page on my website and I can help further.

hello i got a 125 quad yesterday! and i was riding it today and it shut off when i was giving it revs then i let it idle and it slowly idled slower till it shut off please help me

@thejunkman

9 жыл бұрын

sounds like a fuel problem, possible clogged fuel line, fuelcock, or debris in the tank. check this first then watch my getting an old bike runing again video for some more tips.

@birdylover100

9 жыл бұрын

thejunkman it has a new carb in it should i check it anyway

@thejunkman

9 жыл бұрын

birdylover100 Yes, new carbs, tanks and fuel lines can have manufacturing debris in them.

How can I reach you either in your FB or web site???

How can I get my seat out? It's stuck in there really tight?

@thejunkman

10 жыл бұрын

I don't really have a good way outside of an easy out or sheet metal screw and yanking on it, this will of course destroy it but your replacing it anyways.

@TYPARX

10 жыл бұрын

thejunkman it almost seems like its not suppose to come out, but i know it should, Im just going to rip it out and buy new one. thanks a lot

I have an 2008 Yamaha raptor 250 and I left it in the rain and when I came back for it the air intake was flooded with water and now it doesn’t start but you can hear it trying to could it be that the carb is flooded and doesn’t allow it to start

@thejunkman

5 жыл бұрын

Water in the fuel, water and fuel don't mix and water doesn't burn. Drain and clean the entire fuel system and I bet it will run again.

@westcoastbullz8391

5 жыл бұрын

thejunkman the screw to empty the carb is stripted/won’t budge

@westcoastbullz8391

5 жыл бұрын

thejunkman how do I clean out the fuel system

@thejunkman

5 жыл бұрын

Remove the float bowl completely

@thejunkman

5 жыл бұрын

I have videos and information on my site all about this. In general, everywhere the fuel goes needs to be drained and cleaned for debris.

yeahh, didn't work, sadly, so it looks like I'm going to be getting a new carb, It's a BS26SS I think, off a '92 GN125, can't figure out what the equivalent carb is nowadays, Mikui doesn't sell them on their site. Ah well. did manage to adjust the floats up a millimeter or so without taking them off, hopefully that helps....

my 87 kx 250 is a bitch to start cold it has compression maybe the choke? i cleaned the whole carb it seems like its not getting fuel. ideas?

@thejunkman

7 жыл бұрын

Well first, check the carburetor and make sure it is set up to the factory specifications. Check to make sure the jet sizes, float height, jet needle clip position are stock. Next make sure the float needle is in good shape and is letting fuel to flow into the carburetor bowl.

@kevinstearns4198

7 жыл бұрын

i got it it was the choke i took it out and cleaned the shit out of it.

Well a carb kit shouldn't be $100. If it is just the bowl gasket leaking that is pretty cheap and an easy fix. If it is leaking out the overflow you have other issues inside the carburetor. Visit the webpage and leave a comment on the video page and it will be easier for me to respond. Follow the link in the description

You are correct, modifying the stock exhaust will probably mean you will have to adjust the jetting slightly for the difference in flow characteristics of your modified exhaust. Given you have no idea how a carb works I would first study up on basic theory first so when someone gives you advice you have some idea what they are talking about. Explanation would be too lengthy for a comment here. Contact me via Facebook and I can "try" to explain or help. However I cannot recommend any changes

what is the purpose of that little "button" spring on the needle valve?

@thejunkman

7 жыл бұрын

It helps east the "shock" and vibration from the engine or if in the case of motocross bikes landing off of jumps and things, otherwise it could damage the brass tang.

@KevDoesStuff

7 жыл бұрын

thejunkman dangit. I def measured the float height with the float depressing that little spring thing...

@thejunkman

7 жыл бұрын

Measurement should be taken with the tang just touching the needle valve.

@KevDoesStuff

7 жыл бұрын

thejunkman ya I know that now after seeing ur video. I hope it will be fine.

@thejunkman

7 жыл бұрын

+Kevin well it will be slightly high which means it will be rich maybe.

I am not sure what part you are talking about unless it is the air OR fuel screw. Comment on my website if you have more questions as I can explain better with out being limited by number of characters.

this is a 2000 polaris 325 magnum the performance is not right. after rebuild carb it is not firing well when a lot of gas is applied.I inspected plug and it was black.I put in new one and same results. where do you look for too much gas.

@thejunkman

6 жыл бұрын

Well it is hard to pin exactly down which setting or settings to change. Watch my carburetor jetting video for help in understanding what you should change. You are running rich so you need to lean out certain settings, probably the main jet for starters, but maybe the jet needle clip position. Watch my video to understand how these parts affect the air/fuel mix in the carburetor at different throttle openings. kzread.info/dash/bejne/gWlnxZOBqKanpaw.html

fyi...the goverment passed a bill that allows oil companys to now be allowed to use up to 15% ethanol,they were at 10 % before...there are products out there that you can use to offset the ethanol..car engines can handle it fine so can inboard boat engines...all outboards,atvs...small aircooled engines can have problems running on it, newer bikes are suppose to be able to run on it, 2 strokes have problems at the 10% especially the outboards

how can i know if i need to clan muy carbuator

@thejunkman

8 жыл бұрын

+Victor Martinez If it has been sitting for a long time, if you are having performance problems, or if you ran poor fuel through it.

@VictorMartinez-pm2gq

8 жыл бұрын

evry time i try to step on The gas muy 220 kawaski atv wants to turn of or die ...isit because of The carbuator

@thejunkman

8 жыл бұрын

+Victor Martinez Most likely it is. You probably have dirt in the carburetor bowl that is blocking one or more of the carburetor jets or passages. A full dis-assembly and cleaning is needed. Re-assembly using the service manual to set it back to the factory specs and that should cure that problem.

@VictorMartinez-pm2gq

8 жыл бұрын

oooh ok theink you verry muchos..one las question i i put a straight pipe on my atv will it be bad or affect my atv?

@thejunkman

8 жыл бұрын

+Victor Martinez Putting a straight pipe on will generally cause your air/fuel mix to be lean. You will have to jet a little richer. This could be your problem as well

apa.punca..enjan motor bila srtat hidup.lepas masuk giyer terus mati..

@thejunkman

8 жыл бұрын

+Mohd Saffoal Sorry, Google translate has failed me.

@mohdsaffoal5923

8 жыл бұрын

Apa.masalah..bila srtat hidup masuk gryer terus mati.

@thejunkman

8 жыл бұрын

+Mohd Saffoal Goolge translate must not understand this language very well. If I can't translate it, I can't understand what you are asking. Sorry :(

Yes it happens to be a mikuni carburetor. Try driving out the pin with a small pin punch and a brass hammer. Be VERY careful doing this.

I am not familiar with that machine/carb. I would have to look into it. You sure your adjusting the idle speed adjustment? "Like" my facebook page and comment there. I an respond to you easier over there. The links are on my channel page.

Your on the right track, but you probably don't need a rebuild kit. Your problem is probably just a combination of poor fuel, dirty fuel, partially clogged jets or passages. Your "flooding" problem is probably a lean mixture problem from one or more of the the aforementioned issues. I can rule out a sinking float as you didn't state that the carb was overflowing out the vent hoses or being wet in the air box. Hit me up on Facebook for an easier way to converse.

Let me know how it goes. You may contact me via my facebook page.

Probably poor fuel or contamination and varnish starting to form and partially blocking some passages. Hit me up on my facebook page or my website and I can help you more.

You Donnie Baker?

@thejunkman

7 жыл бұрын

Who is that?

@zgovitz

7 жыл бұрын

thejunkman KZread his channel. Your voice sounds like his

@thejunkman

7 жыл бұрын

I probably won't. But thanks for watching!

Likes on my channel page

I am sorry but I cannot read or understand what you are asking or what you just typed.

CV carbs are a nightmare

Never heard of that brand. Can't help you. Sorry