HOW-TO Pressure Test A 2 Cycle Carburetor

[@mebcool]

Thanks Donyboy 73 I really appreciate your mild mannered personality. Keep up the great work sir.

[@bernardviau1795]

Dony, you are a born teacher...

[@donyboy73]

i love to teach! i'm not here just for subs

[@mohabatkhanmalak1161]

I have some old 1950's small engines and we also have lawn care machines at home. These videos will come in handy. Thank you and thumbs up.

[@EHS603]

I always learn something from watching your channel. Thanks.

[@kd5dvmkatdaddie114]

Thank you Don. You write straight with crooked lines. That means you always give me a new insight how to perform OPE testing a little better, quicker and good logic with inputs and outputs and what to check next.You're the best.

[@johnlanzatella4226]

You are the best! Came across your vids when I had a short in my Craftsman tractor. You are a wealth of knowledge without the lame " acting" that a lot of others make the viewer go through. And your always spot on. Not just guessing like many others. Thank you!

[@williammoore5924]

GM to Sir. It’s always a pleasure to listen and watch your informative videos. Keep them coming. Ordering a pressure tester today. Later Dony

[@wysetech2000]

Your video's just keep getting better.

[@michaelchilders6056]

Thank you again Don. I’m trying to learn all I can about small engines and your videos never fail.👍👍

[@zx8401ztv]

Smashing test :-D It's too easy to forget testing information over the years if it's a once in a blue moon problem. Lucky for us, a loverly chap called Don has made lots of help videos over the years :-D. Thankyou for all your videos Don, the live version of the haynes workshop manual, with tricks and valuable tips :-D

[@donyboy73]

thanks man

[@spelunkerd]

Well stated, I feel the same way.

[@pm270100]

i been here for 5 years don is the best

[@zx8401ztv]

I do think don is a live version of the haynes repair manual, if you don't have the tool he will show you another way :-D

[@paulroosa9932]

PR DESIGNS This should be everyone's go to spot for information on small engines! I have always found the info and processes I needed for keeping my engines running properly. Donny Boy is concise and obviously knows his stuff....NO bull**** from him!!! I do have a question I was hoping someone could help me answer though......I have a Walbro off of a 031 and a Tillotson off of a 041. I have put complete rebuild kits in both and no matter what I do I get a leak down on the pump side. I know the needle/seat are good as I have tested it with that side open under water and the seat doesn't bubble. is there a tip for sealing up those flexible valves and gaskets on the pump side even with all new parts?? Should i just try running it before buying new carbs?? Thanks DonnyBoy and anyone else who can help

[@jim21804]

Great video. I always learn something new watching your videos. Of course, by following your videos on how to properly care for my equipment allows me to avoid a lot of the repairs you show in your other videos!!!!!

[@Treestouch]

Thank you for this film, it has helped me further diagnose and repair my equipment🙏

[@reganmccutcheon8616]

We also do a vacuum test and it indicates if check valves are working, should hold pressure and vacuum if not carb should be replaced not rebuilt

[@geojor]

very practical info Dony !

[@nashguy207]

Donyboy great educational video. Very helpful for a lot of people. Have a great day. God Bless!!!

[@waltercooling8907]

Dony, be sure to add the info about diapham flexability and post height- it can bleed off pressure because it will depress the lever. Make sure the lever arm is at proper height in relation to the carb body

[@jessemixon5764]

Thank you Don, for sharing your years knowledge with others I appreciate it- I'm learning that you just can't always clean and put a kit in a carburetor and it work properly- it also seems to make a difference to put back original equipment quality parts when repairing equipment and sometimes it's best to put a new part back in it as opposed to rebuilding the old one

[@tonym6920]

Great demonstration Dony!

[@RBAERO]

Nice video. I have many engines with different cc's, 50cc rc engine, 70cc hacksaw, 20cc and others most with Walbro Carbs. How I know or calculate the right pressure for each engine/carburetors?

[@andrewsteele7663]

Thanks Don, love your tutorials, I have subscribed and look forward to all that you post, I have learnt so much that I have serviced all my small engines,, successfully, cheers and hello from Queensland

[@Dmax04]

Very informative. Thank you. Just rebuilt a HDC 44 on a Homelite Super E-Z. Leaks around the gaskets and won't hold any pressure. So far I've been unable to locate another carb.

[@terracewaggoner6412]

I have a 280 cc 2 stroke engine with a Walbro WB Carb. The carb on the unit came with a PSI popoff pressure of 11 PSI. The company says the pop-off pressure should be 17-19 PSI. How do you calibrate the Popoff pressure making it 17-19 PSI. Thanks in advance for your assistance.

[@Jack.of.all.learning]

As always, great video. Your tone and presentation is 👍👍

[@rpavlik1]

That was a great video - really good to have this kind of general, fundamentals content. Works even if I don't have a Stihl chainsaw 😄

[@alanlake5220]

Where did you get the pressure tester from, and what is the part no, great vid by the way

[@waltercooling8907]

Make your own-it's easy and cheap

[@sunilsenevirathne4245]

Thank you sir appreciated your kind experlation hope you will give more creations in future

[@tacx1]

@@waltercooling8907 ok, are you going to share this info ???

[@donens9310]

Donyboy; have Husq 266 with Tillotson hs254b. My tester shows inHg and mmHg. Any idea on what the 7 psi should be on my tester? Also, what does it mean if the pressure test goes up, then very slowly goes down and settles to a spot, then stays there with no further decrease?

[@larrys8086]

dony..thanks for all the great info but as a rookie I have a question. Is there a rule of thumb as to how to identify the intake from the impulse ?

[@camreed7073]

very very good video Danny thank you for the lessen

[@welostourdemocracy]

The inlet side of the carb, is that the diaphragm side or the reed valve side? What is the best way to know for certain you're putting air in the correct tube of the carb to check the seat valve? The weed eater I'm working on, Poulan Pro 335, did not have gas lines on it.

[@BrucesShop]

Thanks Don. You are the 2 stroke MAN

[@robbeaupre8110]

Dony, you have the best videos on KZbin! Good timing as I was considering this kind of pressure tester vs the Mityvac MIT8500. I just ordered the Mityvac because I believe I can use it for bleeding the brakes on my ATV. Can you confirm I can use the Mityvac to do these tests in your video as well. I have seen other vids so I'm pretty sure I can.

[@donyboy73]

yes u can

[@dennishall7422]

Very handy information, Great test equipment that we had decades ago.

[@98306]

Thank You Don for the valuable information. Can you please give more information on the Tool that is being used and where to buy

[@adkfoothills1973]

Very informative and helpful videos, Donyboy. Thank you, you have definitely made a difference. 🙂🙂

[@butler386]

Excellent video. I may have to get a tester.

[@jawnjw]

Learn something new from you all the time I had no ideal you could pressure test a carb thanks

[@battlehrfred]

excellent information and ty for explaaining 100--100 video !! BTW were did you buy thid pump, or where did you buy the pieces to make this pump, excellent ty

[@mikeshoenberger]

Do you have the part number for the pressure tester.

[@henrikjonsson4340]

Thanks It what theydo with car engines but with smoke. Can you do that here too? I have done almost everything but still can not get it running. I have sprayed into the channels, changed the diagphram but not the gaskets because it looked good. It is also good to look over the other externely gaskets after the carburator into the combustion chamber. Any leaks will be disastres to the mashine. Look all the way.

[@comet7894]

Great video, which pressure tester do you think is best?

[@PedroRodriguez-he1ou]

Hi how can i make one of those pressure tester or where can i buy one. Thank you for the information you share

[@jorgeortega1709]

Do you have a link where you can get that tester?

[@Reparatour]

Google for: CARBURETOR PRESSURE TESTER GAUGE

[@franklinkopecky9644]

search for walbro pressure tester

[@franklinkopecky9644]

amazon or ebay... they are about 30 or 40 bucks

[@christopherjuarez7039]

I searched and kept getting different products. Try searching for "pop off pressure guage" and it should help.

[@viewer54322]

I bought a mityvac radiator pressure tester online, it is a hand pump w/ gauge. Cost is nearly the same as the carb pressure testers but you also get radiator cap adapters that fit most vehicles. Be aware that there is another mityvac that looks similar but it only is for creating vacuum and doesn't come with caps. They also carry one called the silver edition which can do both vacuum and pressure I believe. The pressure tester that dony is using is durable, lighter and smaller but that may not be important to you if you aren't using it daily as he does.

[@bigbob0042]

Great Video Dony

[@swordfish1120]

What purpose does that hole on the carb cover plate serve? Will a Mityvac that has a pressure pump feature work the same as the pump you are using?

[@TheReefa24]

thank you for making one of the most informative videos on YT. across all ive looked for this video of yours certainly is the best. i work on husky 61 aswell, im a hire shop repair tech. learnt alot from your Vidz. THANK YOU SO MUCH!

[@malikrameez703]

Very very useful information how I can test carburettor without tester

[@ADA5611]

Hey Don thanks for VIDEO on pressure testing 2 cycle carburetors. I have a BVM200VS poulan pro leaf blower. Installed new carburetor can't get it run. Have any suggestions.

[@kelvinpen3144]

Can I use this type of carb pressure tester also for testing chainsaw crankcase pressure ? Or do I need a different one such as the mityvac8500 Thx

[@donyboy73]

better with the mityvac

[@kelvinpen3144]

@@donyboy73 Thanks I was hoping to do two testing jobs with one tool ?

[@DavidMartin-wq5pn]

Great vid. Looking for a replacement carb for a 1975 lawnboy, any suggestions?

[@donyboy73]

check ebay

[@87GP400]

Thanks for adding the tips at the end !

[@TH-cl5be]

hello if i squirt brake cleaner in the fuel entry point it comes straight out the return pipe part is my needle not seated ?

[@lesliedownes4935]

Where can I get one of the pressure testers that you are using, please.

[@dennisjoiner3717]

As usual I enjoy your videos. I do have a question. I have had one of those pressure testers for many years, but it's time for a rebuild. Do you have any idea if there is a rebuild kit available for it, and if so where to get one?

[@donyboy73]

no rebuild kit, Stens has a good tester

[@mattmaxon7783]

I don't have one of these but I'd wager just looking at it, there are a couple o-rings that are easily available that need to be replaced, how to get that bad boy apart is a good question

[@MrTurbo64]

Sometimes just a small adjustment of the needle valve lever is all it takes to get that weedeater running again. Pry it up ever so slightly and make sure needle valve moves freely and try again.

[@RBAERO]

How we change the pop-off pressure on walbro carbs?

[@robertchaffee5662]

Do you have a link to that pressure tester?

[@jcssmallenginerepair3261]

Hey Don, so what do you do when you have a two-cycle carb with a primer and it passed all leak tests but will not pull fuel when priming?

[@davidsaltz5708]

Where can I find the pressure tester?what tester costs?

[@mafosa8519]

Where did you get that tester? Larry

[@BearE9090]

Great tip for removing pressure from the line.

[@mecanica2tempososcarmotors68]

Olá gostei do seu vídeo, onde posso adquirir uma ferramenta como essa?

[@brianb5779]

You have a video that covers the check valves throughout these carbs?

[@kenhilson786]

Is there a way to test primer when primer is exterior to the carb so primer has line to carb and line to tank return.

[@mudell.hunter0426]

Great video Donny 👍👍

[@hankhamadi3410]

Great videos,where can I get a pressure and vacuum gauge like the one u have?

[@dtjones17]

where did you get that hand pump?

[@robertchaffee5662]

Very informative! Great job!

[@eldigitom9680]

That was a fantastic video, and VERY thorough...thx!

[@Saw_Squatch]

Should a carb hold any kind of vacuum?

[@splash5974]

Thank you Always showing us great tips!

[@GrampiesWorkshop]

How's she goin'? Some great tips here Dony. Thanks a lot for sharing!!! Take care!!!

[@jsjoe66]

What is the make and model of this tester and where can I purchase it?

[@mupcountry7153]

Does this apply to motorcycle carbs too?

[@CFProton]

Can you overpressure a carb and damage the seals? Thanks for another great self help video.

[@christopherjuarez7039]

Yes, you don't want to go over 7 or 10 psi but don't quote me on it do some research if you're gonna buy the tool.

[@donyboy73]

yes u can, don't go over 10

[@Okie-Tom]

Very good demonstration in the fundamental testing of the carbs. I have one on an Echo weedeater that I rebuilt the carb with a kit but cannot get it to idle correctly. I have to run the idle speed screw all the way in and it barely idles. And it is hard to get it to rev up to high speed without it bogging a lot, regardless of how I adjust the mixture screws. Any ideas?

[@newschool0]

Assuming you dont have air leaks in the crankcase, try running it without the muffler. If it runs fine check muffler/spark arrestor screen to see if its plugged up.

[@BillyTpower]

sorry, Don for the stupid question I am just learning. does the metal part of the diaphragm always face down toward the needle valve?

[@donyboy73]

yes it does

[@franciscobarrios9508]

Gracias por compartir. Hoy aprendí algo nuevo

[@jjparody8257]

Wow, a Tillotson carb on that Husqvarna. Haven't seen one of those classics in quite a while.

[@Bill_CBR]

Great video, thanks for sharing. Will help with keeping my tools in good working order.

[@Bill_CBR]

I already removed, cleaned, and reinstalled the carburetor on my pressure washer with a Honda engine. Idling and throttle-up running like a charm now. Previously was having to manage the choke lever to get to run continuously. Main jet was clogged almost entirely.

[@jimmypopp2695]

Hey Don, Thank you for this video! I am gearing up to start a mobile small engine/equipment repair/welding business in PA and I saw you on the Small engine Nation with Fill and am learning all I can about two cycle engines. I raced a KXT250 Tecate in the 90's but things never stay exactly the same. Where are you located my friend?

[@donyboy73]

congrats on your new business, I'm in Ontario Canada. I'm also a bike rider too!

[@jimmypopp2695]

@@donyboy73 Thank you Dony. I am thinking abut doing free pickup and delivery for equipment and here is why. I have a place to do the work but it is at a relative's and I cannot have customers coming and going.within reason I would pickup and deliver anything all the way down to a chainsaw. I know this wil modify itself as I get more business. thank you again. love the vids.

[@paulmorrey733]

Thanks Don What make of pressure tester was used ? Cheers

[@donyboy73]

Walbro 57-21-1

[@paulmorrey733]

@@donyboy73 Cheers

[@PaulLeMay3218]

Great tip. Thank you for sharing. 🇨🇦😎

[@stevenandrews6627]

Very helpful. Great post.

[@burtpilon1735]

Great video thx for sharing. Can I get the part # for brass hose adaptor that you have hooked up to use with different size fuel lines. I’ve never seen that particular one Thx

[@charlythouvenot1746]

Hi Dony, excellent vid' from you as always, but, you don't test the pop-off pressure? Isn't it an important thing to check with those testers? I've learned on an rc website that it should be at 0.8bar Hi from France

[@billk5727]

Great video and explanations with tips! Thanks man! TakeCare, Bill

[@calvinmientke3539]

XCLNT ! Another video to make me look smarter. Thanks! CM

[@robertsimard735]

Great video. Thanks for sharing.

[@smartcrow7630]

Hi Don, Can you tell me where to buy a pressure gauge system like yours? Thank You, nice video!! =KL=

[@donyboy73]

what's your email?

[@arthurfricchione8119]

Don’t as usual another good video. Thanks for sharing your knowledge. Have a good one. 👍👍👍

[@johnclarke6647]

What you really have to look at, today, is - is the carb plumbed correctly. I picked up a little MAC saw a few weeks ago and the idiot that had owned it, previously, had plumbed it up all wrong. The fuel line was plugged into the carb and not the primer bulb and the overflow line was plugged into the carb. New fuel lines and diaphragms correct the running problems of this saw. When I doubt concerning the fuel lines I always consult an IPLfor the specific model of saw i am working on. The little Mac not starts with one pull and runs fine. I did pressure test it with my Mighty Vac to 7#.

[@KevinKasmer]

Where can I get that tester?

[@rltkktlr]

Nice video. Can you put a link for that pressure tester please.

[@jdimeo1966]

Yes, I would like that as well.

[@Contractorrepair]

Donnie where did you get the pressure tester from could you just reply and send the link

[@donyboy73]

got it years ago from an oem supplier, I will post a set I am selling later today on Instagram and facebook donyboy73

[@Contractorrepair]

@@donyboy73 Thanks .

[@germancarfan]

Google 'CTS leak detector'

[@marknye51.thefixitguy]

I don't have that pressure tester. Where can I buy one and what is it's actual name and brand. Thanks Dony

[@mikefisc9989]

Walbro 57-21-1. Price varies from $125.00 to $180.00 USD or more depending on where it is in stock.

[@bakerenoch]

where do you buy that pressure tester?

[@lukepodolski8818]

How do you fix when you pressure test carb and you have a leak from air valve screws?

[@donyboy73]

i replace diaphragm gasket

[@lukepodolski8818]

@@donyboy73 I got a solo 651 chainsaw and the carb is leaking from the high and low air valve screws. How would you fix that?

[@donyboy73]

@@lukepodolski8818 sometimes clear nail polish works on the outside of threads

[@lukepodolski8818]

@@donyboy73 thank you: ill give it a try

[@theone9564]

Hello sir! I got a stihl 015l chainsaw. Rebuilt carburetor however it turns s on stays on with throttle. H is all the was down but when I start to open it chainsaw turns off. Any ideas.

[@scottfirman]

I have been working on small engines for 30 plus years and never used a pressure tester. I used mine at first but honestly, over the years you know exactly what those small carburetor needs when they act up. Lately I have been replacing the whole carburetor on anything that is older than 5 years. I can usually get better results from replacing a carb than rebuilding it. Especially an older one. Good luck finding those check valves for the primer. I have not been able to find ANYONE that sells them. If you have a link, please send it. I trashed 3 carbs last year because of failed primer check valves. As I stated, usually anything over 5 years gets a new carb anyways. I just do not have time to mess with some gunky old chainsaw carb that is plugged 12 ways to Sunday.