Lawn Mower Won't Stay Running? Briggs & Stratton Carburetor
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- Опубликовано: 11 июн 2011
- This video provides step-by-step instructions for replacing the carburetor on Briggs and Stratton small engines, commonly found in lawn mowers, riding tractors, zero-turn radius mowers, wheeled edgers, pressure washers, and generators. The most common reason for replacing the carburetor is if the engine is hard to start, leaks gas, runs poorly, won’t start or stay running.
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All the information in this carburetor replacement video is applicable to the following brands: Briggs & Stratton
Tools used: flat-head screwdriver, Phillips screwdriver, nutdriver, clamp cutter, socket wrench
Model displayed: Briggs & Stratton small engine 128T05/5123-B1
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![How to Fix a Lawn Mower by Cleaning the Carburetor [Briggs & Stratton and Tecumseh]](/img/1.gif)
I understood the title perfectly! Since I have a front, back and side yard to mow, I have been using the engineered , 4 cycle gas from Walmart or Home Depot, more expensive for sure, but my mower does start every time and even after harsh, upper midwest winters. Thanks for the video!
My mower is barely 2 years old, and was just cleaned within 3 months. I don't have a dusty yard. I'm way too poor not to know more about this stuff. Thanks for trying to help.
Thanks to this video I was able to replace my carburetor on my Toro 22 Recycler . It runs like a top now . Thanks Guys !!
Excellent video! I have a Toro that hadn’t been started in years. I ordered a new carburetor. I found your video to be the best for removal and reinstallation. She started on the first pull!
Excellent Video. Followed your instructions and now mower runs great.
Mark Goyak Great. Thank you.
Very helpful, this will help me clean my carb
excellent video, thank you - very clear..
A video by someone who sells carburetors. The real problem 90% of the time is a clogged fuel jet which is in the half-inch nut on the bottom of the fuel bowl (or just water in the bowl itself, both of which can be easily fixed by removing nothing but that nut and fuel bowl assembly, which can be reached from the front without removing anything else. Sad part is that the entire issue could've been prevented by the use of an in-line fuel filter which they didn't build in.
sskyking1 Just wanted to thank you for your comment, because of what you wrote my lawnmower works again. Thank you so much.
Thank you for your time comment and advice now I can fix my lawnmower to skyking1
Fixed it for me too. Thank you!
I am going to try this again. I had no luck a couple weeks ago.
Thank you.
I like this video. It showed me how to repair a lawn mower (Briggs and Stratton) that start and die. It's very helpfull . Many thanks.
Worked perfectly! Thank you so much! Even when brand new, this mower gave me fits trying to keep it started and I chalked it up to bad gas. I think it came fully loaded with a bad carburetor!
Who know? So much cheap junk coming out of China but I bought a brand new carb on Amazon for $29.00. I still have to spray starter fluid almost every time to get it started : ( but with the new carb, it STAYS running. The old one just kept quitting. So frustrating! I don't think I will buy a #Toro again.
Great! I hope the carb clean goes well.
I need to know the name of the peice that carries the fuel from the carb to the head. Mine was plastic and the end broke and it no longer runs.
Thank you Sir very much you was a big help.
Great one, thanks
Video was perfect. I replaced my carburator in 10 minutes. Lawn mower fired right up. Thanks!
Nice!
Thank you. I was wondering where the "O" ring went. The mower was missing the original "O" ring . No wonder the guy couldn't keep it running.
Thank you I found one.
Kevin
Loosen gas cap and see if it then runs. Vent may be plugged.
THANKS
Should of done this before taking my lawnmower for service. I’m still have problems!
An incredibly clear and concise video and help. Thank you!
Had the exact mower in the video. Ran perfectly for the first 10 years, I only watched the video to replace the carb. However, after replacing the carb I saw that the paper gasket was a bit worn and the o-ring had a crack. Maybe all it really needed was to replace those two items. 10 years from now maybe I'll do just that.
Thanks 👍👍
What if it's a problem with the air-feed in the top of the fuel cap? You've not even mentioned diagnosis - but just dived in, replacing components willy-nilly. If the B&S does not start at all I'd first go for the spark plug. Did you?
I replaced carb and started mower it ran rough and eventually died. I figured the choke wasn't opening up as it was spewing black smoke. When I pulled it apart I found that I had managed to jam the air vane/choke lever so that it wouldn't operate. I removed the screw holding the air vane /choke lever in place and managed to set it up so the choke operated freely. I put it back together and now it won't start at all. Any ideas?
@annonomous me, try your trick, it just works! Thanks!!
I have never done this before and your tutorial was spot on! I would suggest naming socket sizes to be extra helpful. However, overall, this was excellent! Thank you so much!
You're welcome!
If you would like to give us a review, here is our link: g.page/r/CcVUrahZNozMEBM/review
Have a great day!
Did you figure out the socket size? I had an appointment for a local business to come out to fix my mower for $80 and he never showed. Then I paid a local handyman who said he could do it and the guy didn't even have his own tools. At this point I'll buy the dang tools and do it myself.
it is cheaper now a days with time and parts, to just replace parts though, deal with that alot in the marine industry, we used to disassemble and clean switches and solenoids and other electrical parts, now they get replaced, for dependability and longevity, also parts arent made here, theyre made overseas... CHEAP, so they can be replaced cheaper than repairing
Ok!!! Bit the title of this video doesn't say replace the carburetor.
I was thinking, "maybe I don't have to replace the carburetor." So, I clicked on this video.
use premium fuel in small engine , for some reason it works better and does not gum up in a carburetor after long storage ,
second if you have a fuel valve turn it off while the engine is running and wait until the fuel dries out from the carburetor ,
Fuel left in the carburetor for a long time will dry up and damage the carburetor , installing a fuel shut off valve is easy ,
If engine is hard to start remove the spark plug and use a propane torch burn off the Corbin residue and whatever might be on the spark plug , I do it until the Central Electric and the ground electroid get red hot , of course wait until the spark plug cool down before reinstalling it , in the Old Country Palestine we used to put a small amount of gasoline on the ground put the spark plug in the middle of it and set it on fire , that always worked to get us out of a jam ,
Reality is this is a design issue (lack of fuel filter). I use regular gas station gas on all of my other small engines and have for decades without ever experiencing this issue before. Mower manufacturers are trying to push people toward their high-priced special fuels by designing their engines to be more picky than ever before. First mower I've ever had that didn't have a fuel filter and I will never buy another without making sure it has one.
Nidal Shehadeh
I moved from Seattle WA to South Florida , as if was moving to a different planet , high humidity and Heat messes up just about anything and everything , batteries up north will last about five years down here 1 1/2 to 3 years , in my 2000 Grand Cherokee battery lasted about 2 years 3 months , the same thing with small engines , in the summer heat fuel in the carburetor dry up and gum up your carburetor overnight , A fuel filter is immensely important in any setup what is more important is a fuel shut off valve , before storing youre small engine turn off the fuel shut off valve and wait until the engine dies, in other words drain the fuel out of the carburetor this way you won't have any carburetor issues or should I say It reduces chances that you would have any carburetor problems
Or you can just buy the filter next to the mowers at Home Depot for $5 and install in 5 minutes. Cut the fuel line and squeeze it on. Done.
excellent idea , down here in South Florida we have what we call snowbirds , population swells up by 60% , people coming from up North running away from the cold and in the summer they all go up North so you have about six month of equipment setting idle in the garage somewhere , that's where the fuel valve comes in .
make it look so easy
how do you fix the old carb, not replace it?
I can't seem to find an air filter base without a primer bulb like the one at 0:46. Does anyone have a link to one like this?
Really stuck here. Had the exact same issue as everyone else...would start from primer and then stop. Totally removed carb. Cleaned with carb cleaner and pipe cleaners to clean all ports and tubes. made sure too get holes in bowl plug. Changed out gas, and used rebuild kit and replaced gaskets and needle. mower started and ran great last night. when it got dark put it away and now doing exactly same thing today when tried to finish yard. Took back apart looking for any clogs or dirt, nothing... any ideas on what could still be the problem?
It's got serious problems. Get a new one. Easier ...
Thanks for the clear instructions. Most of us in New Zealand want to just clean out the dirt that is blocking our jets in the carb, rather than replace the whole thing, must be our pioneer roots... Are you able to give some instructions for this please? I am having problems with a similar (older but similar model 129802) Quantum engine that starts and runs at good revs for a few seconds but cuts out suddenly as if the fuel flow (or spark) has stopped. I've dismantled and cleaned the carb, and noticed what looks like a welsh plug in it, (possibly covering up a couple of fine jets?) I've checked the tank is venting OK as well. There are 2 holes in the centre of the carb above the bottom nut / jet, one of these goes to the brass tube in the venturii air flow, where does the other one go? Thanks for any help.
+reelMn In the U.S we have ethanol in our gasoline and if that fuel is not treated properly it can clog a carburetor beyond cleaning at times. If so, the whole carburetor has to be replaced. If New Zealand has similar fuel issues, cleaning may not cut it.
My issue.
Full gas, good on oil.
It starts, but won't stay on after Choke. it also dies sometimes after a while even on choke.
When we first took it out today, it would not turn off. We have to WD40 the wires and it works now for stopping. Maybe the issue is something wrong with the wires. (I don't know what the metal cords are called)
What about the three springs, what is thier function?
Instead of replacing carb, i unbolted fuel bowl, cleaned out bowl, replaced, and engine was running in 5 minutes total.
I tried this and it worked, omg. Thank you very much.
Didn't work for me at all.
I did that, and cleaned the carburetor, and it ran for another 2 hours, then stopped again. I am replacing the carburetor now. It's not like it's expensive, or a big job.
This is worth a shot, but no luck for me.
IT WORKED!
Just got a question. Is there any other reason for the engine to start and stall out besides the carburetor? Or should I just go and get a new carb.
Bill Taylor Most problems with engines not running properly are carburetor related. Maintenance items like oil, air filter, and spark plug could cause it too if they are not replaced regularly.
Usually carb. If you hit something hard a sheered flywheel key can cause start stall situation but that usually damages the blade. Sheered key often causes the recoil to snap back hard when you pull it.
Please help, I follow your instructions to the letter/ I Installed a new carburetor. but the mower runs a couple minutes and stop what to do
How much play should be in the choke lever assembly while carburetor is off.......I have mine off waiting on new one to come in but I feel worried about that choke lever assembly it is really loose.....is that a problem or is that normal?
It all depends on what type of choke you have. If you have a manual choke you should be able to pull a lever and keep the choke closed and open it when the engine starts. Some have an auto choke that will automatically close the choke when the engine is cold. As long as the choke is not staying on when the engine warms up it shouldn't cause a problem.
Thank you 😇
Where can I buy a troy bilt B&S lawnmower carburetors
D
Amazon has them, I bought one last week and got it in 3 days.
What about the primer bulb and assembly. Is there any reason to look there and perform some kind of maintenance before changing out the carburetor?
+Gregory Tate This video is intended to show you how to replace a carburetor not diagnose why an engine won't start. See our repair help for additional help. www.repairclinic.com/RepairHelp/Lawn-Mower-Repair-Help?TLSID=1773
Could have answered my question. Same question led me to that video.
Actually, this video is intended to get you to replace a carburetor that you likely don't need to! Far more likely it's just a clogged fuel inlet and that's an easy fix, and one that a fuel filter (which these don't have) would've prevented!
We are looking for a solution to "the engine starts but when you let the clutch off the engine dies!! Problem???
Hey ***** , I accidentally mixed the wrong fluids into the wrong tank. Now my mower wouldn't start after I drained the fluids out of the fuel tank and replaced it with ethanol free fuel. Do you have any Idea of what might be the problem?
I have a brand new Stow & Mow and the engine doesn't seem to be running well. It takes a while to get up to full running speed and dies quickly when going through thick grass. I have to lift up the back of it from the handle and it gets running quickly again, but doesn't last long. It also smells likes its running rich. Strong fuel smell. Cleaned the air filter and carb... both looked fine. What could be my problem?
We Bring the Party, LLC We would start by analyzing the fuel you are using? Newer engines are really sensitive to gasoline that contains ethanol and the problem is compounded if stored longer than six months. Cleaning a carburetor does not always get all all the sludge out and replacement may be needed.
What about a car rebuild, most how-to videos on this topic show how to clean debris out of the float bowl, and replace the needle valve and valve seat. A new carb is going to be pretty expensive, and probably overkill. No?
i do small engine repair, their is no reason to buy a new carb. 90% of small engine problems is a fuel issue, clean the jet ports out and it will run! AND dont leave it in the rain, the gas cap has vents in it, water will get in your fuel
Excellent point, keep it on that way ....
LAZY, they are too lazy to overhaul the old one. Or maybe their technician can't do that difficult of a repair. A kit is a lot cheaper.
I don't know how to clean the jet ports. I'm guessing they're in the carburetor. Neither my Dad nor his Dad worked on engines, so I didn't have much chance to learn.
Agree with your written statement. You also sometimes run into gasoline that you buy that already has water in it. Both my Power King tractors are not running right, both have Kohler engines in them, and they both arn't running or stall out when you increase the throttle. I believe it's because of water or moisture in the gas. Have to drain out the gas and put in fresh gas. The one could use a tune up with new points and condenser, while at it, new plug as well with the proper gap on the plug.
MONEYBAGS603 it runs fine but it won’t shutdown?
hi,
Would apprec some help and advice. Used you video and all seemed well. Mower worked for one long cut with multiple starts. Week later started for couple of second and I turned it off to adjust height setting and now it will not start no mater what (fuel and oil levels ok). Have checked and spark plug OK (using multimetre) and there is current from the magneto (used tester that lights up). Motor does not even seem to turn over. Just pull cord and magnet etc works but no ignition. Tried with out filter, tried to spray some carb cleaner into carb in case it is not priming (has auto choke and primer). Fuel is held in can so no chance of water in fuel etc. Auto choke arm sitting OK and moving correctly. I am now stuck. Any ideas.
What is your lawn mower's engine's model number?
I replaced my carburetor but the choke lever assembly was not able to move at all when I put it back together. Did I miss something or did something come detached under the motor housing that would me it tight?
You may need to remove the filter housing to see the choke arm is on properly. You may need to remove the choke arm or just try not tightening the bolt as tight that the arm pivots on. Hope this helps find your problem.
Do you have a video on removing a old Briggs 3 HP on an old mower. Probably from 70 or 60s
Unfortunately we don't have anything that old. Sorry about that.
my toro runs for 3 secs and stalls, but when I want to try it again I have to prime it 3x for it to run for 3 secs, if I don't prime it, it wont turn over. Do I have a dirty gas filter or faulty carb?
Probably build up inside your carb, due to ethanol in gas. Watch a youtube video, I like the one from Jeff's little engine service "New Toro lawnmower won't start"...with zero experience, it should take about 6 hours to fix it! If your mower wasn't left in the weather, it's probably not your fuel filter. ( in tank)
very good I am learn alone?
Or just clean it
I bought my carb for $12 shipped new on ebay. You almost spend that much on 3 bottles of carb cleaner, plus your time messing with the jets and chemicals.
Me too - definitely the way to go!
@@Sharkracer01 I thought you were gonna say 3 bottles of beer :)
Men i need your advice! just bought a new mower brand new my lazy son didn't want to cut the yard. Now im out here trying too start my mower but it want start! White smoke bursted out and it shuts off..Any suggestions? please help before i hurt my 14 yr old son lol
it was used only once last week and now this week it want start
i found one of these engines on the side of the road it had a full tank of gas all i had to do was put some fresh oil in it and it fired up with one pull
i am working on making the motor into a racing mower engine for my Murray racing mower
it was on the side of the road not in someones truck i asked before i took it and they said they didnt care
mine has no choke plate otherwise looks the same . will not start without a shot of ether then its great
New carburator?
what is that "breather tube" for? i dont understand what that is for
Crankcase ventilation, any unburnt combustible vapors in the crankcase are recycled into the carburetor.
Stop using a brand new, never-before-used lawn mower as your example.
They do that with everything they demonstrate.
Why?
I have tried everything. I changed the oil. spark plug, took the cup under the carburetor and cleaned it. It still won't stay running.
Is it that simple on a craftsman?
Steve Walther - A lot of Craftsman mowers use a Briggs amd Stratton motor, so probably.
24 horsepower briggs and stratton just put new fuel pump, fuel filter, lines, carburetor, and air filter on it all brand new and still have to prime to get it to start what wrong
Slow down buddy I haven't finished my beer.
W Morris
W Morris that's cool your slogan
W Morris what's that little breather go to or does it just get plugged
correct, this is easily a 3-6 pack job
My pull. Cord broke
This wasn't much of a repair. He just replaced a part rather then fixing anything.
So i changed my spark plug, carb, and air filter, all brand new.. it fixed the putting and smoke but now it only runs for maybe 5 min then dies and wont start up at all? What do i doooo?
Also new gas
Sounds like a bad coil. Will it start again when it cools down?
mine don't look like this at all
since we're just replacing things rather than fixing them, why not save all the troubles and just buy a new mower?? better still send someone else out to buy it for you and have them mow the lawn...
i paid 279.00 for my lawn mower 5 years ago and new carburetor cost under 19 dollars. in other words its cheaper to replace the carburetor vs buying another mower
new carb is $15 on amazon
Did all that. Still doesn't start without starter fluid, then dies.
not the type of carburetor on my pressure washer
Easier to clear the old one
Than hava a beer or 12
Got a little Dirt and varnish in the carb? throw it the hell away because you hate money!
OR, after spending 3 days watching numerous RUclips videos, doing everything they say INCLUDING cleaning the float bowl and jet in the bottom and STILL not having the mower work, rather than studying to become a small engine repair woman, I just went over to amazon, spent 15 dollars on a new carb, bolted it on per this video and NOW I'm about to go out any actually mow the grass/weeds.
Brought one end of the summer last year and used it once. Tried to cut the lawn recently and the piece of shit doesn't work. One cut, one cut!! Perfectly stored everything checked, doesn't work!!!!
Not good advertising if this mower wouldn't stay running. It looked like just came out of the box.
title is incredibly misleading. Just change the title and it's a good video. just wasted 3 minutes of my life
+Jacob D Done, thanks!
There was no need to replace the carb. just clean it and it should be fine unless you want to rebuild it. The gasket was ok, no need to replace that either. This is all wrong, do a little work for a change and stop screwing the customers for new parts when they don't need them.
Meh...I grabbed one off of Ebay for 12 bucks shipped. Just bolt it on and no fuss. Cleaning / rebuilding takes time and materials - heck a rebuild kit costs almost as much as the new carb! As a practice I change mine out every 3 years and my mower will probably outlast me.
If I have a problem, I clean the carb and it is usually fine after that, never had a come back for anything, it has been 20 years now.
12 lousy bucks man - well worth the insurance and fast fix up. To each his own I guess.
Yup, same here. Just picked one up for $12 and saved the hassle and time. Also picked up a $5 inline fuel filter and installed in the fuel line.
Paul Brown. Hello can u help me? My fiance jus brought a used lawn mower 5 days ago. It was staying on running gd. It will crank on 1 pull wit no trouble. Only thing whn it gets on the grass it shuts off every time don't stay running.
The title should say replacing a carburetor. Period.
This video explains absolutely nothing on WHY it wouldn't stay running. Sure replacing the carb, is one way, but, why not explain why it wouldn't run ;then go from there.
For some great info on how a small engine works please click here: ruclips.net/video/YMsOM4H2Uxs/видео.html
RepairClinic.com
I've cleaned everything. I need to know how to adjust the screws.
RepairClinic.com
I've cleaned everything. I need to know how to adjust the screws.
RepairClinic.com I have a Sears Craftsman #2, eager-1. 4.5/20 inch 3 in 1 convertable
Is you're brand new, never used mower not running? Take out the very clean never used bolts that will come off with no effort...or be in the real world where those bolts are a bitch... After that clean you're float bowl and jet. And if you're really lucky you'll have to rip half the engine apart to get to one bolt XD
Are you serious....buy a new and install. I was pretty sure you would show how to clean and repair the carburetor instead of just buying a new one.
we are not 5th graders, enough of safety talk
waste of time vid.....why don't you show us how to repair/tune/fix the old carbie......if you need a vid to show you how to place on a newly brought carbie then theres something wrong
😡 f all this. It's not that I'm spoiled it's always been a dude that's fixed these type things. And these type things are dude things. I'm about to bug a dude neighbor. Watch them not even know. There needs to be a 101 to this. Like damn, how many tools do I need?
This is a stupid video for sure. so the lawn mower won't stay running. I have a Ford truck that won't stay running. Dare I begin to yank the motor, or should I just find out what's wrong with it? Take this video one step further. It won't stay running, so go out and buy a Honda lawn mower instead. that will fix the mower for sure.